[Kernel] Marlin Expansion: Support AutoGPTQ Models with Marlin (#3922)

Co-authored-by: alexm <alexm@neuralmagic.com>
Co-authored-by: mgoin <michael@neuralmagic.com>

CMakeLists.txt

@@ -177,6 +177,8 @@ if(VLLM_GPU_LANG STREQUAL "CUDA")
     "csrc/quantization/aqlm/gemm_kernels.cu"
     "csrc/quantization/awq/gemm_kernels.cu"
     "csrc/quantization/marlin/marlin_cuda_kernel.cu"
+    "csrc/quantization/gptq_marlin/gptq_marlin.cu"
+    "csrc/quantization/gptq_marlin/gptq_marlin_repack.cu"
     "csrc/custom_all_reduce.cu")
 endif()
 

csrc/ops.h

@@ -124,6 +124,24 @@ torch::Tensor marlin_gemm(
     int64_t size_m, 
     int64_t size_n, 
     int64_t size_k);
+
+torch::Tensor gptq_marlin_gemm(
+  torch::Tensor &a,
+  torch::Tensor &b_q_weight,
+  torch::Tensor &b_scales,
+  torch::Tensor &g_idx,
+  torch::Tensor &perm,
+  torch::Tensor &workspace,
+  int64_t size_m,
+  int64_t size_n,
+  int64_t size_k,
+  bool is_k_full);
+
+torch::Tensor gptq_marlin_repack(
+  torch::Tensor &b_q_weight,
+  torch::Tensor &perm,
+  int64_t size_k,
+  int64_t size_n);
 #endif
 
 void squeezellm_gemm(

csrc/pybind.cpp

@@ -67,6 +67,8 @@ PYBIND11_MODULE(TORCH_EXTENSION_NAME, m) {
   ops.def("aqlm_dequant", &aqlm_dequant, "Decompression method for AQLM");
   ops.def("awq_gemm", &awq_gemm, "Quantized GEMM for AWQ");
   ops.def("marlin_gemm", &marlin_gemm, "Marlin Optimized Quantized GEMM for GPTQ");
+  ops.def("gptq_marlin_gemm", &gptq_marlin_gemm, "gptq_marlin Optimized Quantized GEMM for GPTQ");
+  ops.def("gptq_marlin_repack", &gptq_marlin_repack, "gptq_marlin repack from GPTQ");
   ops.def("awq_dequantize", &awq_dequantize, "Dequantization for AWQ");
 #endif
  

csrc/quantization/gptq_marlin/gptq_marlin.cuh

@@ -0,0 +1,74 @@
+#pragma once
+
+#include <torch/extension.h>
+
+#include <ATen/cuda/CUDAContext.h>
+#include <c10/cuda/CUDAGuard.h>
+#include <cuda.h>
+#include <cuda_fp16.h>
+#include <cuda_runtime.h>
+#include <iostream>
+
+namespace gptq_marlin {
+
+// 8 warps are a good choice since every SM has 4 schedulers and having more than 1 warp per
+// schedule allows some more latency hiding. At the same time, we want relatively few warps to have
+// many registers per warp and small tiles.
+static constexpr int default_threads = 256;
+
+static constexpr int pipe_stages = 4; // 4 pipeline stages fit into shared memory
+
+static constexpr int min_thread_n = 64;
+static constexpr int min_thread_k = 64;
+
+static constexpr int tile_size = 16;
+static constexpr int max_par   = 16;
+
+static constexpr int pack_factor_4bit = 8; // We have 8 4-bit vals inside a 32 bit
+
+template <typename T, int n>
+struct Vec {
+  T             elems[n];
+  __device__ T& operator[](int i) { return elems[i]; }
+};
+
+using I4 = Vec<int, 4>;
+
+constexpr int div_ceil(int a, int b) { return (a + b - 1) / b; }
+
+#if defined(__CUDA_ARCH__) && __CUDA_ARCH__ < 800
+  // No support for async
+#else
+
+__device__ inline void cp_async4_pred(void* smem_ptr, const void* glob_ptr, bool pred = true) {
+  const int BYTES = 16;
+  uint32_t  smem  = static_cast<uint32_t>(__cvta_generic_to_shared(smem_ptr));
+  asm volatile("{\n"
+               "   .reg .pred p;\n"
+               "   setp.ne.b32 p, %0, 0;\n"
+               "   @p cp.async.cg.shared.global [%1], [%2], %3;\n"
+               "}\n" ::"r"((int)pred),
+               "r"(smem), "l"(glob_ptr), "n"(BYTES));
+}
+
+__device__ inline void cp_async4_stream(void* smem_ptr, const void* glob_ptr) {
+  const int BYTES = 16;
+  uint32_t  smem  = static_cast<uint32_t>(__cvta_generic_to_shared(smem_ptr));
+  asm volatile("{\n"
+               "   .reg .b64 p;\n"
+               "   createpolicy.fractional.L2::evict_first.b64 p, 1.0;"
+               "   cp.async.cg.shared.global.L2::cache_hint [%0], [%1], %2, p;\n"
+               "}\n" ::"r"(smem),
+               "l"(glob_ptr), "n"(BYTES));
+}
+
+__device__ inline void cp_async_fence() { asm volatile("cp.async.commit_group;\n" ::); }
+
+template <int n>
+__device__ inline void cp_async_wait() {
+  asm volatile("cp.async.wait_group %0;\n" ::"n"(n));
+}
+
+#endif
+
+} // namespace gptq_marlin

csrc/quantization/gptq_marlin/gptq_marlin_repack.cu

@@ -0,0 +1,324 @@
+#include "gptq_marlin.cuh"
+
+namespace gptq_marlin {
+
+static constexpr int repack_stages = 8;
+
+static constexpr int repack_threads = 256;
+
+static constexpr int tile_k_size = tile_size;
+static constexpr int tile_n_size = tile_k_size * 4;
+
+#if defined(__CUDA_ARCH__) && __CUDA_ARCH__ < 800
+
+template <int const num_threads, bool const has_perm>
+__global__ void
+marlin_repack_kernel(uint32_t const *__restrict__ b_q_weight_ptr,
+                     uint32_t const *__restrict__ perm_ptr,
+                     uint32_t *__restrict__ out_ptr, int size_k, int size_n) {}
+
+} // namespace gptq_marlin
+
+torch::Tensor gptq_marlin_repack(torch::Tensor &b_q_weight, torch::Tensor &perm,
+                                 int64_t size_k, int64_t size_n) {
+  TORCH_CHECK_NOT_IMPLEMENTED(
+      false, "marlin_repack_from_gptq(..) requires CUDA_ARCH >= 8.0");
+  return torch::empty({1, 1});
+}
+
+#else
+
+template <int const num_threads, bool const has_perm>
+__global__ void
+marlin_repack_kernel(uint32_t const *__restrict__ b_q_weight_ptr,
+                     uint32_t const *__restrict__ perm_ptr,
+                     uint32_t *__restrict__ out_ptr, int size_k, int size_n) {
+  int k_tiles = size_k / tile_k_size;
+  int n_tiles = size_n / tile_n_size;
+  int block_k_tiles = div_ceil(k_tiles, gridDim.x);
+
+  int start_k_tile = blockIdx.x * block_k_tiles;
+  if (start_k_tile >= k_tiles) {
+    return;
+  }
+
+  int finish_k_tile = min(start_k_tile + block_k_tiles, k_tiles);
+
+  // Wait until the next thread tile has been loaded to shared memory.
+  auto wait_for_stage = [&]() {
+    // We only have `stages - 2` active fetches since we are double buffering
+    // and can only issue the next fetch when it is guaranteed that the previous
+    // shared memory load is fully complete (as it may otherwise be
+    // overwritten).
+    cp_async_wait<repack_stages - 2>();
+    __syncthreads();
+  };
+
+  extern __shared__ int4 sh[];
+
+  constexpr int perm_size = tile_k_size / 4;
+
+  int4 *sh_perm_ptr = sh;
+  int4 *sh_pipe_ptr = sh_perm_ptr;
+  if constexpr (has_perm) {
+    sh_pipe_ptr += perm_size;
+  }
+
+  constexpr int stage_n_threads = tile_n_size / 4;
+  constexpr int stage_k_threads =
+      has_perm ? tile_k_size : tile_k_size / pack_factor_4bit;
+  constexpr int stage_size = stage_k_threads * stage_n_threads;
+
+  auto load_perm_to_shared = [&](int k_tile_id) {
+    int first_k_int4 = (k_tile_id * tile_k_size) / 4;
+
+    int4 const *perm_int4_ptr = reinterpret_cast<int4 const *>(perm_ptr);
+
+    if (threadIdx.x < perm_size) {
+      sh_perm_ptr[threadIdx.x] = perm_int4_ptr[first_k_int4 + threadIdx.x];
+    }
+    __syncthreads();
+  };
+
+  auto fetch_to_shared = [&](int pipe, int k_tile_id, int n_tile_id) {
+    if (n_tile_id >= n_tiles) {
+      cp_async_fence();
+      return;
+    }
+
+    int first_n = n_tile_id * tile_n_size;
+
+    int4 *sh_ptr = sh_pipe_ptr + stage_size * pipe;
+
+    if constexpr (has_perm) {
+      if (threadIdx.x < stage_size) {
+        int k_id = threadIdx.x / stage_n_threads;
+        int n_id = threadIdx.x % stage_n_threads;
+
+        uint32_t const *sh_perm_int_ptr =
+            reinterpret_cast<uint32_t const *>(sh_perm_ptr);
+
+        int src_k = sh_perm_int_ptr[k_id];
+        int src_k_packed = src_k / pack_factor_4bit;
+
+        cp_async4_stream(
+            &sh_ptr[k_id * stage_n_threads + n_id],
+            reinterpret_cast<int4 const *>(&(
+                b_q_weight_ptr[src_k_packed * size_n + first_n + (n_id * 4)])));
+      }
+
+    } else {
+      if (threadIdx.x < stage_size) {
+        int k_id = threadIdx.x / stage_n_threads;
+        int n_id = threadIdx.x % stage_n_threads;
+
+        int first_k = k_tile_id * tile_k_size;
+        int first_k_packed = first_k / pack_factor_4bit;
+
+        cp_async4_stream(&sh_ptr[k_id * stage_n_threads + n_id],
+                         reinterpret_cast<int4 const *>(
+                             &(b_q_weight_ptr[(first_k_packed + k_id) * size_n +
+                                              first_n + (n_id * 4)])));
+      }
+    }
+
+    cp_async_fence();
+  };
+
+  auto repack_tile = [&](int pipe, int k_tile_id, int n_tile_id) {
+    if (n_tile_id >= n_tiles) {
+      return;
+    }
+
+    int warp_id = threadIdx.x / 32;
+    int th_id = threadIdx.x % 32;
+
+    if (warp_id >= 4) {
+      return;
+    }
+
+    int tc_col = th_id / 4;
+    int tc_row = (th_id % 4) * 2;
+
+    constexpr int tc_offsets[4] = {0, 1, 8, 9};
+
+    int cur_n = warp_id * 16 + tc_col;
+
+    constexpr int sh_stride = 64;
+
+    int4 *sh_stage_ptr = sh_pipe_ptr + stage_size * pipe;
+    uint32_t *sh_stage_int_ptr = reinterpret_cast<uint32_t *>(sh_stage_ptr);
+
+    uint32_t *sh_perm_int_ptr = reinterpret_cast<uint32_t *>(sh_perm_ptr);
+
+    uint32_t vals[pack_factor_4bit];
+
+    if constexpr (has_perm) {
+      for (int i = 0; i < 4; i++) {
+        int k_idx = tc_row + tc_offsets[i];
+
+        uint32_t src_k = sh_perm_int_ptr[k_idx];
+        uint32_t src_k_pos = src_k % pack_factor_4bit;
+
+        uint32_t b1_val = sh_stage_int_ptr[k_idx * sh_stride + cur_n];
+        uint32_t b1_cur_val = (b1_val >> (src_k_pos * 4)) & 0xf;
+
+        uint32_t b2_val = sh_stage_int_ptr[k_idx * sh_stride + cur_n + 8];
+        uint32_t b2_cur_val = (b2_val >> (src_k_pos * 4)) & 0xf;
+
+        vals[i] = b1_cur_val;
+        vals[4 + i] = b2_cur_val;
+      }
+
+    } else {
+
+      uint32_t b1_val_1 = sh_stage_int_ptr[cur_n];
+      uint32_t b1_val_2 = sh_stage_int_ptr[sh_stride + cur_n];
+
+      uint32_t b2_val_1 = sh_stage_int_ptr[cur_n + 8];
+      uint32_t b2_val_2 = sh_stage_int_ptr[sh_stride + cur_n + 8];
+
+#pragma unroll
+      for (int i = 0; i < 2; i++) {
+        int cur_elem = tc_row + tc_offsets[i];
+        vals[i] = (b1_val_1 >> (cur_elem * 4)) & 0xf;
+        vals[4 + i] = (b2_val_1 >> (cur_elem * 4)) & 0xf;
+      }
+
+#pragma unroll
+      for (int i = 2; i < 4; i++) {
+        int cur_elem = tc_row + tc_offsets[i] - 8;
+        vals[i] = (b1_val_2 >> (cur_elem * 4)) & 0xf;
+        vals[4 + i] = (b2_val_2 >> (cur_elem * 4)) & 0xf;
+      }
+    }
+
+    // Result of:
+    // https://github.com/NVIDIA/FasterTransformer/blob/main/src/fastertransformer/cutlass_extensions/include/cutlass_extensions/interleaved_numeric_conversion.h
+    constexpr int pack_idx[pack_factor_4bit] = {0, 2, 4, 6, 1, 3, 5, 7};
+
+    uint32_t res = 0;
+#pragma unroll
+    for (int i = 0; i < pack_factor_4bit; i++) {
+      res |= vals[pack_idx[i]] << (i * 4);
+    }
+
+    constexpr int tile_size = tile_k_size * tile_n_size / pack_factor_4bit;
+    int out_offset = (k_tile_id * n_tiles + n_tile_id) * tile_size;
+
+    out_ptr[out_offset + th_id * 4 + warp_id] = res;
+  };
+
+  auto start_pipes = [&](int k_tile_id, int n_tile_id) {
+#pragma unroll
+    for (int pipe = 0; pipe < repack_stages - 1; pipe++) {
+      fetch_to_shared(pipe, k_tile_id, n_tile_id + pipe);
+    }
+
+    wait_for_stage();
+  };
+#pragma unroll
+  for (int k_tile_id = start_k_tile; k_tile_id < finish_k_tile; k_tile_id++) {
+    int n_tile_id = 0;
+
+    if constexpr (has_perm) {
+      load_perm_to_shared(k_tile_id);
+    }
+
+    start_pipes(k_tile_id, n_tile_id);
+
+    while (n_tile_id < n_tiles) {
+#pragma unroll
+      for (int pipe = 0; pipe < repack_stages; pipe++) {
+        fetch_to_shared((pipe + repack_stages - 1) % repack_stages, k_tile_id,
+                        n_tile_id + pipe + repack_stages - 1);
+        repack_tile(pipe, k_tile_id, n_tile_id + pipe);
+        wait_for_stage();
+      }
+      n_tile_id += repack_stages;
+    }
+  }
+}
+
+} // namespace gptq_marlin
+
+torch::Tensor gptq_marlin_repack(torch::Tensor &b_q_weight, torch::Tensor &perm,
+                                 int64_t size_k, int64_t size_n) {
+  // Verify compatibility with marlin tile of 16x64
+  TORCH_CHECK(size_k % gptq_marlin::tile_k_size == 0, "size_k = ", size_k,
+              " is not divisible by tile_k_size = ", gptq_marlin::tile_k_size);
+  TORCH_CHECK(size_n % gptq_marlin::tile_n_size == 0, "size_n = ", size_n,
+              " is not divisible by tile_n_size = ", gptq_marlin::tile_n_size);
+
+  // Verify B
+  TORCH_CHECK((size_k / gptq_marlin::pack_factor_4bit) == b_q_weight.size(0),
+              "Shape mismatch: b_q_weight.size(0) = ", b_q_weight.size(0),
+              ", size_k = ", size_k,
+              ", pack_factor_4bit = ", gptq_marlin::pack_factor_4bit);
+  TORCH_CHECK(b_q_weight.size(1) == size_n,
+              "b_q_weight.size(1) = ", b_q_weight.size(1),
+              " is not size_n = ", size_n);
+
+  // Verify device and strides
+  TORCH_CHECK(b_q_weight.device().is_cuda(), "b_q_weight is not on GPU");
+  TORCH_CHECK(b_q_weight.is_contiguous(), "b_q_weight is not contiguous");
+  TORCH_CHECK(b_q_weight.dtype() == at::kInt, "b_q_weight type is not kInt");
+
+  TORCH_CHECK(perm.device().is_cuda(), "perm is not on GPU");
+  TORCH_CHECK(perm.is_contiguous(), "perm is not contiguous");
+  TORCH_CHECK(perm.dtype() == at::kInt, "perm type is not at::kInt");
+
+  // Alloc buffers
+  const at::cuda::OptionalCUDAGuard device_guard(device_of(b_q_weight));
+  auto options = torch::TensorOptions()
+                     .dtype(b_q_weight.dtype())
+                     .device(b_q_weight.device());
+  torch::Tensor out = torch::empty(
+      {size_k / gptq_marlin::tile_size,
+       size_n * gptq_marlin::tile_size / gptq_marlin::pack_factor_4bit},
+      options);
+
+  // Detect if there is act_order
+  bool has_perm = perm.size(0) != 0;
+
+  // Get ptrs
+  uint32_t const *b_q_weight_ptr =
+      reinterpret_cast<uint32_t const *>(b_q_weight.data_ptr());
+  uint32_t const *perm_ptr =
+      reinterpret_cast<uint32_t const *>(perm.data_ptr());
+  uint32_t *out_ptr = reinterpret_cast<uint32_t *>(out.data_ptr());
+
+  // Get dev info
+  int dev = b_q_weight.get_device();
+  cudaStream_t stream = at::cuda::getCurrentCUDAStream(dev);
+  int blocks;
+  cudaDeviceGetAttribute(&blocks, cudaDevAttrMultiProcessorCount, dev);
+
+  int max_shared_mem = 0;
+  cudaDeviceGetAttribute(&max_shared_mem,
+                         cudaDevAttrMaxSharedMemoryPerBlockOptin, dev);
+  TORCH_CHECK(max_shared_mem > 0);
+
+  if (has_perm) {
+    cudaFuncSetAttribute(
+        gptq_marlin::marlin_repack_kernel<gptq_marlin::repack_threads, true>,
+        cudaFuncAttributeMaxDynamicSharedMemorySize,
+        max_shared_mem);
+    gptq_marlin::marlin_repack_kernel<gptq_marlin::repack_threads, true>
+        <<<blocks, gptq_marlin::repack_threads, max_shared_mem,
+           stream>>>(b_q_weight_ptr, perm_ptr, out_ptr, size_k, size_n);
+
+  } else {
+    cudaFuncSetAttribute(
+        gptq_marlin::marlin_repack_kernel<gptq_marlin::repack_threads, false>,
+        cudaFuncAttributeMaxDynamicSharedMemorySize,
+        max_shared_mem);
+    gptq_marlin::marlin_repack_kernel<gptq_marlin::repack_threads, false>
+        <<<blocks, gptq_marlin::repack_threads, max_shared_mem,
+           stream>>>(b_q_weight_ptr, perm_ptr, out_ptr, size_k, size_n);
+  }
+
+  return out;
+}
+
+#endif

tests/models/test_gptq_marlin.py

@@ -0,0 +1,93 @@
+"""Compares the outputs of gptq vs gptq_marlin 
+Note: GPTQ and Marlin do not have bitwise correctness.
+As a result, in this test, we just confirm that the top selected tokens of the
+Marlin/GPTQ models are in the top 3 selections of each other.
+Note: Marlin internally uses locks to synchronize the threads. This can
+result in very slight nondeterminism for Marlin. As a result, we re-run the test
+up to 3 times to see if we pass.
+Note: This test currently fails running with --forked with the following:
+    RuntimeError: Cannot re-initialize CUDA in forked subprocess.
+    To use CUDA with multiprocessing, you must use the 'spawn' start method
+Run `pytest tests/models/test_gptq_marlin.py`.
+"""
+import os
+
+import pytest
+import torch
+
+from tests.models.utils import check_logprobs_close
+from vllm.model_executor.layers.quantization import QUANTIZATION_METHODS
+
+os.environ["TOKENIZERS_PARALLELISM"] = "true"
+
+MAX_MODEL_LEN = 1024
+
+capability = torch.cuda.get_device_capability()
+capability = capability[0] * 10 + capability[1]
+gptq_marlin_not_supported = (
+    capability < QUANTIZATION_METHODS["gptq_marlin"].get_min_capability())
+
+MODELS = [
+    # act_order==False, group_size=channelwise
+    ("robertgshaw2/zephyr-7b-beta-channelwise-gptq", "main"),
+    # act_order==False, group_size=128
+    ("TheBloke/Llama-2-7B-GPTQ", "main"),
+
+    # act_order==True, group_size=128
+    ("TheBloke/TinyLlama-1.1B-Chat-v1.0-GPTQ", "main"),
+    # act_order==True, group_size=64
+    ("TheBloke/TinyLlama-1.1B-Chat-v1.0-GPTQ", "gptq-4bit-64g-actorder_True"),
+    # act_order==True, group_size=32
+    ("TheBloke/TinyLlama-1.1B-Chat-v1.0-GPTQ", "gptq-4bit-32g-actorder_True"),
+]
+
+
+@pytest.mark.flaky(reruns=2)
+@pytest.mark.skipif(gptq_marlin_not_supported,
+                    reason="gptq_marlin is not supported on this GPU type.")
+@pytest.mark.parametrize("model", MODELS)
+@pytest.mark.parametrize("dtype", ["half"])
+@pytest.mark.parametrize("max_tokens", [32])
+@pytest.mark.parametrize("num_logprobs", [5])
+def test_models(
+    vllm_runner,
+    example_prompts,
+    model,
+    dtype: str,
+    max_tokens: int,
+    num_logprobs: int,
+) -> None:
+    model_name, revision = model
+
+    # Run marlin.
+    gptq_marlin_model = vllm_runner(model_name=model_name,
+                                    revision=revision,
+                                    dtype=dtype,
+                                    quantization="marlin",
+                                    max_model_len=MAX_MODEL_LEN,
+                                    tensor_parallel_size=1,
+                                    disable_custom_all_reduce=True)
+
+    gptq_marlin_outputs = gptq_marlin_model.generate_greedy_logprobs(
+        example_prompts, max_tokens, num_logprobs)
+    del gptq_marlin_model
+
+    # Run gptq.
+    gptq_model = vllm_runner(model_name=model_name,
+                             revision=revision,
+                             dtype=dtype,
+                             quantization="gptq",
+                             max_model_len=MAX_MODEL_LEN,
+                             tensor_parallel_size=1,
+                             disable_custom_all_reduce=True)
+    gptq_outputs = gptq_model.generate_greedy_logprobs(example_prompts,
+                                                       max_tokens,
+                                                       num_logprobs)
+    del gptq_model
+
+    check_logprobs_close(
+        outputs_0_lst=gptq_outputs,
+        outputs_1_lst=gptq_marlin_outputs,
+        name_0="gptq",
+        name_1="gptq_marlin",
+    )

tests/models/test_marlin.py

@@ -10,12 +10,12 @@ up to 3 times to see if we pass.
 
 Run `pytest tests/models/test_marlin.py`.
 """
-
 from dataclasses import dataclass
 
 import pytest
 import torch
 
+from tests.models.utils import check_logprobs_close
 from vllm.model_executor.layers.quantization import QUANTIZATION_METHODS
 
 capability = torch.cuda.get_device_capability()
@@ -55,43 +55,24 @@ def test_models(
     max_tokens: int,
     num_logprobs: int,
 ) -> None:
-    marlin_model = vllm_runner(model_pair.model_marlin, dtype=dtype)
+    marlin_model = vllm_runner(model_pair.model_marlin,
+                               dtype=dtype,
+                               quantization="marlin")
     marlin_outputs = marlin_model.generate_greedy_logprobs(
         example_prompts, max_tokens, num_logprobs)
-
-    # Note: not sure why, but deleting just the model on Ada Lovelace
-    #   does not free the GPU memory. On Ampere, deleting the just model
-    #   frees the memory.
     del marlin_model
 
-    gptq_model = vllm_runner(model_pair.model_gptq, dtype=dtype)
+    gptq_model = vllm_runner(model_pair.model_gptq,
+                             dtype=dtype,
+                             quantization="gptq")
     gptq_outputs = gptq_model.generate_greedy_logprobs(example_prompts,
                                                        max_tokens,
                                                        num_logprobs)
-
-    # Note: not sure why, but deleting just the model on Ada Lovelace
-    #   does not free the GPU memory. On Ampere, deleting the just model
-    #   frees the memory.
     del gptq_model
 
-    # loop through the prompts
+    check_logprobs_close(
-    for prompt_idx in range(len(example_prompts)):
+        outputs_0_lst=gptq_outputs,
-        gptq_output_ids, gptq_output_str, gptq_logprobs = gptq_outputs[
+        outputs_1_lst=marlin_outputs,
-            prompt_idx]
+        name_0="gptq",
-        marlin_output_ids, marlin_output_str, marlin_logprobs = marlin_outputs[
+        name_1="marlin",
-            prompt_idx]
+    )
-
-        for idx, (gptq_output_id, marlin_output_id) in enumerate(
-                zip(gptq_output_ids, marlin_output_ids)):
-            # If sequence is not an exact match,
-            if marlin_output_id != gptq_output_id:
-                # Each predicted token must be in top 5 of the other's
-                assert gptq_output_id in marlin_logprobs[idx], (
-                    f"Test{prompt_idx}:\nGPTQ:\t{gptq_output_str!r}\n"
-                    f"Marlin:\t{marlin_output_str!r}")
-                assert marlin_output_id in gptq_logprobs[idx], (
-                    f"Test{prompt_idx}:\nGPTQ:\t{gptq_output_str!r}\n"
-                    f"Marlin:\t{marlin_output_str!r}")
-
-                # Break out since sequences will now diverge.
-                break

tests/models/utils.py

@@ -0,0 +1,29 @@
+def check_logprobs_close(outputs_0_lst, outputs_1_lst, name_0, name_1):
+    """Compare the logprobs of two sequences generated by different models, 
+    which should be similar but not necessarily equal.
+    """
+    # Loop through responses to each prompt.
+    for prompt_idx, (outputs_0,
+                     outputs_1) in enumerate(zip(outputs_0_lst,
+                                                 outputs_1_lst)):
+        output_ids_0, output_str_0, logprobs_0 = outputs_0
+        output_ids_1, output_str_1, logprobs_1 = outputs_1
+
+        # Loop through generated tokens.
+        for idx, (output_id_0,
+                  output_id_1) in enumerate(zip(output_ids_0, output_ids_1)):
+
+            # If generated tokens don't match, then
+            if output_id_0 != output_id_1:
+                # Each predicted token must be in top N logprobs of the other
+                assert output_id_0 in logprobs_1[idx], (
+                    f"Test{prompt_idx}:"
+                    f"\n{name_0}:\t{output_str_0!r}"
+                    f"\n{name_1}:\t{output_str_1!r}")
+                assert output_id_1 in logprobs_0[idx], (
+                    f"Test{prompt_idx}:"
+                    f"\n{name_0}:\t{output_str_0!r}"
+                    f"\n{name_1}:\t{output_str_1!r}")
+
+                # Break out since sequences will now diverge.
+                break

tests/quantization/test_autogptq_marlin_configs.py

@@ -1,64 +0,0 @@
-"""Tests whether Marlin models can be loaded from the autogptq config.
-
-Run `pytest tests/quantization/test_autogptq_marlin_configs.py --forked`.
-"""
-
-from dataclasses import dataclass
-
-import pytest
-
-from vllm.config import ModelConfig
-
-
-@dataclass
-class ModelPair:
-    model_marlin: str
-    model_gptq: str
-
-
-# Model Id // Expected Kernel
-MODELS_QUANT_TYPE = [
-    # compat: autogptq <=0.7.1 is_marlin_format: bool
-    ("neuralmagic/TinyLlama-1.1B-Chat-v1.0-marlin", "marlin"),
-    ("TheBloke/Llama-2-7B-Chat-GPTQ", "gptq"),
-    # compat: autogptq >=0.8.0 use checkpoint_format: str
-    ("LnL-AI/TinyLlama-1.1B-Chat-v1.0-GPTQ-Marlin-4bit", "marlin"),
-    ("LnL-AI/TinyLlama-1.1B-Chat-v1.0-GPTQ-4bit", "gptq")
-]
-
-
-@pytest.mark.parametrize("model_quant_type", MODELS_QUANT_TYPE)
-def test_auto_gptq(model_quant_type: str, ) -> None:
-    model_path, quant_type = model_quant_type
-
-    model_config_no_quant_arg = ModelConfig(
-        model_path,
-        model_path,
-        tokenizer_mode="auto",
-        trust_remote_code=False,
-        seed=0,
-        dtype="float16",
-        revision=None,
-        quantization=None  # case 1
-    )
-
-    model_config_quant_arg = ModelConfig(
-        model_path,
-        model_path,
-        tokenizer_mode="auto",
-        trust_remote_code=False,
-        seed=0,
-        dtype="float16",
-        revision=None,
-        quantization="gptq"  # case 2
-    )
-
-    assert model_config_no_quant_arg.quantization == quant_type, (
-        f"Expected quant_type == {quant_type} for {model_path}, "
-        f"but found {model_config_no_quant_arg.quantization} "
-        "for no --quantization None case")
-
-    assert model_config_quant_arg.quantization == quant_type, (
-        f"Expected quant_type == {quant_type} for {model_path}, "
-        f"but found {model_config_quant_arg.quantization} "
-        "for --quantization gptq case")

tests/quantization/test_configs.py

@@ -0,0 +1,73 @@
+"""Tests whether Marlin models can be loaded from the autogptq config.
+
+Run `pytest tests/quantization/test_configs.py --forked`.
+"""
+
+from dataclasses import dataclass
+
+import pytest
+
+from vllm.config import ModelConfig
+
+
+@dataclass
+class ModelPair:
+    model_marlin: str
+    model_gptq: str
+
+
+# Model Id // Quantization Arg // Expected Type
+MODEL_ARG_EXPTYPES = [
+    # AUTOGPTQ
+    # compat: autogptq <=0.7.1 is_marlin_format: bool
+    # Model Serialized in Marlin Format should always use Marlin kernel.
+    ("neuralmagic/TinyLlama-1.1B-Chat-v1.0-marlin", None, "marlin"),
+    ("neuralmagic/TinyLlama-1.1B-Chat-v1.0-marlin", "marlin", "marlin"),
+    ("neuralmagic/TinyLlama-1.1B-Chat-v1.0-marlin", "gptq", "marlin"),
+    ("neuralmagic/TinyLlama-1.1B-Chat-v1.0-marlin", "awq", "ERROR"),
+    # Model Serialized in Exllama Format.
+    ("TheBloke/Llama-2-7B-Chat-GPTQ", None, "gptq_marlin"),
+    ("TheBloke/Llama-2-7B-Chat-GPTQ", "marlin", "gptq_marlin"),
+    ("TheBloke/Llama-2-7B-Chat-GPTQ", "gptq", "gptq"),
+    ("TheBloke/Llama-2-7B-Chat-GPTQ", "awq", "ERROR"),
+    # compat: autogptq >=0.8.0 use checkpoint_format: str
+    # Model Serialized in Marlin Format should always use Marlin kernel.
+    ("LnL-AI/TinyLlama-1.1B-Chat-v1.0-GPTQ-Marlin-4bit", None, "marlin"),
+    ("LnL-AI/TinyLlama-1.1B-Chat-v1.0-GPTQ-Marlin-4bit", "marlin", "marlin"),
+    ("LnL-AI/TinyLlama-1.1B-Chat-v1.0-GPTQ-Marlin-4bit", "gptq", "marlin"),
+    ("LnL-AI/TinyLlama-1.1B-Chat-v1.0-GPTQ-Marlin-4bit", "awq", "ERROR"),
+    # Model Serialized in Exllama Format.
+    ("LnL-AI/TinyLlama-1.1B-Chat-v1.0-GPTQ-4bit", None, "gptq_marlin"),
+    ("LnL-AI/TinyLlama-1.1B-Chat-v1.0-GPTQ-4bit", "marlin", "gptq_marlin"),
+    ("LnL-AI/TinyLlama-1.1B-Chat-v1.0-GPTQ-4bit", "gptq", "gptq"),
+    ("LnL-AI/TinyLlama-1.1B-Chat-v1.0-GPTQ-4bit", "awq", "ERROR"),
+
+    # AUTOAWQ
+    ("TheBloke/OpenHermes-2.5-Mistral-7B-AWQ", None, "awq"),
+    ("TheBloke/OpenHermes-2.5-Mistral-7B-AWQ", "awq", "awq"),
+    ("TheBloke/OpenHermes-2.5-Mistral-7B-AWQ", "marlin", "ERROR"),
+    ("TheBloke/OpenHermes-2.5-Mistral-7B-AWQ", "gptq", "ERROR"),
+]
+
+
+@pytest.mark.parametrize("model_arg_exptype", MODEL_ARG_EXPTYPES)
+def test_auto_gptq(model_arg_exptype: str) -> None:
+    model_path, quantization_arg, expected_type = model_arg_exptype
+
+    try:
+        model_config = ModelConfig(model_path,
+                                   model_path,
+                                   tokenizer_mode="auto",
+                                   trust_remote_code=False,
+                                   seed=0,
+                                   dtype="float16",
+                                   revision=None,
+                                   quantization=quantization_arg)
+        found_quantization_type = model_config.quantization
+    except ValueError:
+        found_quantization_type = "ERROR"
+
+    assert found_quantization_type == expected_type, (
+        f"Expected quant_type == {expected_type} for {model_path}, "
+        f"but found {found_quantization_type} "
+        f"for no --quantization {quantization_arg} case")

vllm/config.py

@@ -9,11 +9,14 @@ from packaging.version import Version
 from transformers import PretrainedConfig
 
 from vllm.logger import init_logger
-from vllm.model_executor.layers.quantization import QUANTIZATION_METHODS
+from vllm.model_executor.layers.quantization import (QUANTIZATION_METHODS,
+                                                     get_quantization_config)
 from vllm.transformers_utils.config import get_config, get_hf_text_config
 from vllm.utils import (get_cpu_memory, get_nvcc_cuda_version, is_cpu, is_hip,
                         is_neuron)
 
+GPTQMarlinConfig = get_quantization_config("gptq_marlin")
+
 if TYPE_CHECKING:
     from ray.util.placement_group import PlacementGroup
 
@@ -138,14 +141,34 @@ class ModelConfig:
             is_format_marlin = (quant_cfg.get("checkpoint_format") == "marlin"
                                 or quant_cfg.get("is_marlin_format", False))
 
-            # Use marlin if the GPTQ model is serialized in marlin format.
+            # Check which LinearMethod the GPTQ model should use.
-            if quant_method == "gptq" and is_format_marlin:
+            if quant_method == "gptq":
-                logger.info("The model is serialized in Marlin format. "
+                # If serialized in Marlin format, use MarlinLinearMethod.
-                            "Using Marlin kernel.")
+                # TODO (@robertgshaw): migrate under GPTQMarlinLinearMethod.
-                quant_method = "marlin"
+                if is_format_marlin:
-                if self.quantization == "gptq":
+                    logger.info("The model is serialized in Marlin format. "
-                    self.quantization = quant_method
+                                "Using Marlin kernel.")
+                    quant_method = "marlin"
+                    if self.quantization == "gptq":
+                        self.quantization = quant_method
 
+                # If convertible to Marlin format, use GPTQMarlinLinearMethod
+                # unless the user explicitly specified GPTQLinearMethod.
+                elif GPTQMarlinConfig.is_marlin_compatible(quant_cfg):
+                    if self.quantization == "gptq":
+                        logger.warning(
+                            "The model is convertible to Marlin format, but "
+                            "you specified quantization=gptq. Use "
+                            "quantization=marlin for faster inference.")
+                    else:
+                        logger.info(
+                            "The model is convertible to Marlin format. "
+                            "Using Marlin kernel.")
+                        quant_method = "gptq_marlin"
+                        if self.quantization == "marlin":
+                            self.quantization = quant_method
+
+            # Verify quantization configurations.
             if self.quantization is None:
                 self.quantization = quant_method
             elif self.quantization != quant_method:
@@ -165,7 +188,7 @@ class ModelConfig:
                 raise ValueError(
                     f"{self.quantization} quantization is currently not "
                     f"supported in ROCm.")
-            if self.quantization != "marlin":
+            if (self.quantization not in ["marlin", "gptq_marlin"]):
                 logger.warning(
                     "%s quantization is not fully "
                     "optimized yet. The speed can be slower than "

vllm/model_executor/layers/quantization/__init__.py

@@ -6,6 +6,8 @@ from vllm.model_executor.layers.quantization.base_config import (
     QuantizationConfig)
 from vllm.model_executor.layers.quantization.fp8 import Fp8Config
 from vllm.model_executor.layers.quantization.gptq import GPTQConfig
+from vllm.model_executor.layers.quantization.gptq_marlin import (
+    GPTQMarlinConfig)
 from vllm.model_executor.layers.quantization.marlin import MarlinConfig
 from vllm.model_executor.layers.quantization.squeezellm import SqueezeLLMConfig
 
@@ -15,6 +17,7 @@ QUANTIZATION_METHODS: Dict[str, Type[QuantizationConfig]] = {
     "fp8": Fp8Config,
     "gptq": GPTQConfig,
     "squeezellm": SqueezeLLMConfig,
+    "gptq_marlin": GPTQMarlinConfig,
     "marlin": MarlinConfig,
 }
 

vllm/model_executor/layers/quantization/gptq_marlin.py

@@ -0,0 +1,444 @@
+import enum
+from enum import Enum
+from typing import Any, Dict, List, Optional
+
+import numpy
+import torch
+from torch.nn.parameter import Parameter
+
+from vllm._C import ops
+from vllm.model_executor.layers.linear import (LinearBase, LinearMethodBase,
+                                               set_weight_attrs)
+from vllm.model_executor.layers.quantization.base_config import (
+    QuantizationConfig)
+
+GPTQ_MARLIN_TILE = 16
+GPTQ_MARLIN_MIN_THREAD_N = 64
+GPTQ_MARLIN_MIN_THREAD_K = 128
+GPTQ_MARLIN_MAX_PARALLEL = 16
+
+GPTQ_MARLIN_SUPPORTED_NUM_BITS = [4]
+GPTQ_MARLIN_SUPPORTED_GROUP_SIZES = [-1, 32, 64, 128]
+GPTQ_MARLIN_SUPPORTED_SYM = [True]
+
+
+# Precompute permutations for Marlin weight and scale shuffling
+#
+# Marlin works on [16,64] tiles. The goal of the permutations
+# is to reorder the weight data so that it is compatible
+# with the tensor-core format that is described here:
+# https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#matrix-fragments-for-mma-m16n8k16-with-floating-point-type # noqa: E501
+#
+# As a result of this reordering, the vector loads inside the
+# kernel will get the data as it is needed for tensor-core
+# (without the need to use ldmatrix instructions)
+def _get_perms():
+    perm = []
+    for i in range(32):
+        perm1 = []
+        col = i // 4
+        for block in [0, 1]:
+            for row in [
+                    2 * (i % 4),
+                    2 * (i % 4) + 1,
+                    2 * (i % 4 + 4),
+                    2 * (i % 4 + 4) + 1,
+            ]:
+                perm1.append(16 * row + col + 8 * block)
+        for j in range(4):
+            perm.extend([p + 256 * j for p in perm1])
+
+    perm = numpy.array(perm)
+    interleave = numpy.array([0, 2, 4, 6, 1, 3, 5, 7])
+    perm = perm.reshape((-1, 8))[:, interleave].ravel()  # type: ignore
+    perm = torch.from_numpy(perm)
+    scale_perm = []
+    for i in range(8):
+        scale_perm.extend([i + 8 * j for j in range(8)])
+    scale_perm_single = []
+    for i in range(4):
+        scale_perm_single.extend(
+            [2 * i + j for j in [0, 1, 8, 9, 16, 17, 24, 25]])
+    return perm, scale_perm, scale_perm_single
+
+
+_perm, _scale_perm, _scale_perm_single = _get_perms()
+
+
+def get_pack_factor(num_bits):
+    assert num_bits in GPTQ_MARLIN_SUPPORTED_NUM_BITS, (
+        f"Unsupported num_bits = {num_bits}")
+    return 32 // num_bits
+
+
+def marlin_permute_scales(s, size_k, size_n, group_size):
+    if group_size < size_k and group_size != -1:
+        s = s.reshape((-1, len(_scale_perm)))[:, _scale_perm]
+    else:
+        s = s.reshape((-1, len(_scale_perm_single)))[:, _scale_perm_single]
+    s = s.reshape((-1, size_n)).contiguous()
+
+    return s
+
+
+class GPTQMarlinConfig(QuantizationConfig):
+    """Config class for GPTQ Marlin"""
+
+    def __init__(self, weight_bits: int, group_size: int, desc_act: bool,
+                 is_sym: bool) -> None:
+        if desc_act and group_size == -1:
+            # In this case, act_order == True is the same as act_order == False
+            # (since we have only one group per output channel)
+            desc_act = False
+
+        self.weight_bits = weight_bits
+        self.group_size = group_size
+        self.desc_act = desc_act
+        self.is_sym = is_sym
+
+        # Verify
+        if self.weight_bits not in GPTQ_MARLIN_SUPPORTED_NUM_BITS:
+            raise ValueError(
+                f"Marlin does not support weight_bits = {self.weight_bits}. "
+                f"Only weight_bits = {GPTQ_MARLIN_SUPPORTED_NUM_BITS} "
+                "are supported.")
+        if self.group_size not in GPTQ_MARLIN_SUPPORTED_GROUP_SIZES:
+            raise ValueError(
+                f"Marlin does not support group_size = {self.group_size}. "
+                f"Only group_sizes = {GPTQ_MARLIN_SUPPORTED_GROUP_SIZES} "
+                "are supported.")
+        if self.is_sym not in GPTQ_MARLIN_SUPPORTED_SYM:
+            raise ValueError(
+                f"Marlin does not support is_sym = {self.is_sym}. "
+                f"Only sym = {GPTQ_MARLIN_SUPPORTED_SYM} are supported.")
+
+        # Init
+        self.pack_factor = get_pack_factor(weight_bits)
+        self.tile_size = GPTQ_MARLIN_TILE
+        self.min_thread_n = GPTQ_MARLIN_MIN_THREAD_N
+        self.min_thread_k = GPTQ_MARLIN_MIN_THREAD_K
+        self.max_parallel = GPTQ_MARLIN_MAX_PARALLEL
+
+    def __repr__(self) -> str:
+        return (f"GPTQMarlinConfig(weight_bits={self.weight_bits}, "
+                f"group_size={self.group_size}, "
+                f"desc_act={self.desc_act})")
+
+    @classmethod
+    def get_name(cls) -> str:
+        return "gptq_marlin"
+
+    @classmethod
+    def get_supported_act_dtypes(cls) -> List[torch.dtype]:
+        return [torch.half]
+
+    @classmethod
+    def get_min_capability(cls) -> int:
+        return 80
+
+    @classmethod
+    def get_config_filenames(cls) -> List[str]:
+        return ["quantize_config.json"]
+
+    @classmethod
+    def from_config(cls, config: Dict[str, Any]) -> "GPTQMarlinConfig":
+        weight_bits = cls.get_from_keys(config, ["bits"])
+        group_size = cls.get_from_keys(config, ["group_size"])
+        desc_act = cls.get_from_keys(config, ["desc_act"])
+        is_sym = cls.get_from_keys(config, ["sym"])
+        return cls(weight_bits, group_size, desc_act, is_sym)
+
+    def get_quant_method(
+            self,
+            layer: torch.nn.Module) -> Optional["GPTQMarlinLinearMethod"]:
+        if isinstance(layer, LinearBase):
+            return GPTQMarlinLinearMethod(self)
+        return None
+
+    def get_scaled_act_names(self) -> List[str]:
+        return []
+
+    @classmethod
+    def is_marlin_compatible(cls, quant_config: Dict[str, Any]):
+        # Extract data from quant config.
+        num_bits = quant_config.get("bits", None)
+        group_size = quant_config.get("group_size", None)
+        sym = quant_config.get("sym", None)
+        desc_act = quant_config.get("desc_act", None)
+
+        # If we cannot find the info needed in the config, cannot convert.
+        if (num_bits is None or group_size is None or sym is None
+                or desc_act is None):
+            return False
+
+        # If the capability of the device is too low, cannot convert.
+        major, minor = torch.cuda.get_device_capability()
+        device_capability = major * 10 + minor
+        if device_capability < cls.get_min_capability():
+            return False
+
+        # Otherwise, can convert if model satisfies marlin constraints.
+        return (num_bits in GPTQ_MARLIN_SUPPORTED_NUM_BITS
+                and group_size in GPTQ_MARLIN_SUPPORTED_GROUP_SIZES
+                and sym in GPTQ_MARLIN_SUPPORTED_SYM)
+
+
+class GPTQMarlinState(Enum):
+    REPACK = enum.auto()
+    READY = enum.auto()
+
+
+class GPTQMarlinLinearMethod(LinearMethodBase):
+    """Linear method for GPTQ Marlin.
+
+    Args:
+        quant_config: The GPTQ Marlin quantization config.
+    """
+
+    def __init__(self, quant_config: GPTQMarlinConfig) -> None:
+        self.quant_config = quant_config
+
+    def create_weights(
+        self,
+        layer: torch.nn.Module,
+        input_size_per_partition: int,
+        output_partition_sizes: List[int],
+        input_size: int,
+        output_size: int,
+        params_dtype: torch.dtype,
+        **extra_weight_attrs,
+    ) -> None:
+        del output_size
+
+        # Normalize group_size
+        if self.quant_config.group_size != -1:
+            group_size = self.quant_config.group_size
+        else:
+            group_size = input_size
+
+        # Validate dtype
+        if params_dtype != torch.float16:
+            raise ValueError(
+                f"The params dtype must be float16, but got {params_dtype}")
+
+        # Validate output_size_per_partition
+        output_size_per_partition = sum(output_partition_sizes)
+        if output_size_per_partition % self.quant_config.min_thread_n != 0:
+            raise ValueError(
+                f"Weight output_size_per_partition = "
+                f"{output_size_per_partition} is not divisible by "
+                f" min_thread_n = {self.quant_config.min_thread_n}.")
+
+        # Validate input_size_per_partition
+        if input_size_per_partition % self.quant_config.min_thread_k != 0:
+            raise ValueError(
+                f"Weight input_size_per_partition = "
+                f"{input_size_per_partition} is not divisible "
+                f"by min_thread_k = {self.quant_config.min_thread_k}.")
+
+        if (group_size < input_size
+                and input_size_per_partition % group_size != 0):
+            raise ValueError(
+                f"Weight input_size_per_partition = {input_size_per_partition}"
+                f" is not divisible by group_size = {group_size}.")
+
+        # Detect sharding of scales/zp
+
+        # By default, no sharding over "input dim"
+        scales_and_zp_size = input_size // group_size
+        scales_and_zp_input_dim = None
+
+        if self.quant_config.desc_act:
+            # Act-order case
+            assert self.quant_config.group_size != -1
+
+            is_k_full = input_size_per_partition == input_size
+
+        else:
+            # No act-order case
+
+            # K is always full due to full alignment with
+            # group-size and shard of scales/zp
+            is_k_full = True
+
+            # If this is a row-parallel case, then shard scales/zp
+            if (input_size != input_size_per_partition
+                    and self.quant_config.group_size != -1):
+                scales_and_zp_size = input_size_per_partition // group_size
+                scales_and_zp_input_dim = 0
+
+        # Init buffers
+
+        # Quantized weights
+        qweight = Parameter(
+            torch.empty(
+                input_size_per_partition // self.quant_config.pack_factor,
+                output_size_per_partition,
+                dtype=torch.int32,
+            ),
+            requires_grad=False,
+        )
+        set_weight_attrs(
+            qweight, {
+                **extra_weight_attrs,
+                "input_dim": 0,
+                "output_dim": 1,
+                "packed_dim": 0,
+                "pack_factor": self.quant_config.pack_factor,
+            })
+
+        # Activation order
+        g_idx = Parameter(
+            torch.empty(
+                input_size_per_partition,
+                dtype=torch.int32,
+            ),
+            requires_grad=False,
+        )
+        # Ignore warning from fused linear layers such as QKVParallelLinear.
+        set_weight_attrs(g_idx, {
+            **extra_weight_attrs, "input_dim": 0,
+            "ignore_warning": True
+        })
+
+        g_idx_sort_indices = Parameter(
+            torch.empty(
+                g_idx.shape,
+                dtype=torch.int32,
+            ),
+            requires_grad=False,
+        )
+        set_weight_attrs(g_idx_sort_indices, extra_weight_attrs)
+
+        # Scales
+        scales = Parameter(
+            torch.empty(
+                scales_and_zp_size,
+                output_size_per_partition,
+                dtype=params_dtype,
+            ),
+            requires_grad=False,
+        )
+        set_weight_attrs(
+            scales, {
+                **extra_weight_attrs,
+                "input_dim": scales_and_zp_input_dim,
+                "output_dim": 1,
+            })
+
+        # Quantized zero-points
+        qzeros = Parameter(
+            torch.empty(scales_and_zp_size,
+                        output_size_per_partition //
+                        self.quant_config.pack_factor,
+                        dtype=torch.int32,
+                        device="meta"),
+            requires_grad=False,
+        )
+        set_weight_attrs(
+            qzeros, {
+                **extra_weight_attrs,
+                "input_dim": scales_and_zp_input_dim,
+                "output_dim": 1,
+                "packed_dim": 1,
+                "pack_factor": self.quant_config.pack_factor,
+            })
+
+        # Allocate marlin workspace
+        max_workspace_size = (
+            output_size_per_partition //
+            self.quant_config.min_thread_n) * self.quant_config.max_parallel
+        workspace = torch.zeros(max_workspace_size,
+                                dtype=torch.int,
+                                requires_grad=False)
+
+        layer.register_parameter("qweight", qweight)
+        layer.register_parameter("g_idx", g_idx)
+        layer.register_parameter("g_idx_sort_indices", g_idx_sort_indices)
+        layer.register_parameter("scales", scales)
+        layer.register_parameter("qzeros", qzeros)
+        layer.workspace = workspace
+        layer.input_size_per_partition = input_size_per_partition
+        layer.output_size_per_partition = output_size_per_partition
+        layer.input_size = input_size
+        layer.is_k_full = is_k_full
+        layer.marlin_state = GPTQMarlinState.REPACK
+
+    def apply(
+        self,
+        layer: torch.nn.Module,
+        x: torch.Tensor,
+        bias: Optional[torch.Tensor] = None,
+    ) -> torch.Tensor:
+        reshaped_x = x.reshape(-1, x.shape[-1])
+
+        size_m = reshaped_x.shape[0]
+        part_size_n = layer.output_size_per_partition
+        part_size_k = layer.input_size_per_partition
+        full_size_k = layer.input_size
+
+        out_shape = x.shape[:-1] + (part_size_n, )
+
+        if layer.marlin_state == GPTQMarlinState.REPACK:
+            layer.marlin_state = GPTQMarlinState.READY
+
+            # Newly generated tensors need to replace existing tensors that are
+            # already registered as parameters by vLLM (and won't be freed)
+            def replace_tensor(name, new_t):
+                # It is important to use resize_() here since it ensures
+                # the same buffer is reused
+                getattr(layer, name).resize_(new_t.shape)
+                getattr(layer, name).copy_(new_t)
+                del new_t
+
+            cur_device = layer.qweight.device
+
+            # Process act_order
+            if self.quant_config.desc_act:
+                # Get sorting based on g_idx
+                g_idx_sort_indices = torch.argsort(layer.g_idx).to(torch.int)
+
+                sorted_g_idx = layer.g_idx[g_idx_sort_indices]
+
+                replace_tensor("g_idx", sorted_g_idx)
+                replace_tensor("g_idx_sort_indices", g_idx_sort_indices)
+
+            else:
+                # Reset g_idx related tensors
+                layer.g_idx = Parameter(torch.empty(0,
+                                                    dtype=torch.int,
+                                                    device=cur_device),
+                                        requires_grad=False)
+                layer.g_idx_sort_indices = Parameter(torch.empty(
+                    0, dtype=torch.int, device=cur_device),
+                                                     requires_grad=False)
+
+            # Repack weights
+            marlin_qweight = ops.gptq_marlin_repack(
+                layer.qweight,
+                layer.g_idx_sort_indices,
+                part_size_k,
+                part_size_n,
+            )
+            replace_tensor("qweight", marlin_qweight)
+
+            # Permute scales
+            scales_size_k = part_size_k
+            scales_size_n = part_size_n
+            if self.quant_config.desc_act:
+                scales_size_k = full_size_k
+
+            marlin_scales = marlin_permute_scales(layer.scales, scales_size_k,
+                                                  scales_size_n,
+                                                  self.quant_config.group_size)
+            replace_tensor("scales", marlin_scales)
+
+        output = ops.gptq_marlin_gemm(reshaped_x, layer.qweight, layer.scales,
+                                      layer.g_idx, layer.g_idx_sort_indices,
+                                      layer.workspace, size_m, part_size_n,
+                                      part_size_k, layer.is_k_full)
+
+        if bias is not None:
+            output.add_(bias)  # In-place add
+
+        return output.reshape(out_shape)