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[Misc] Update Fused MoE weight loading (#7334)

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Dipika Sikka 2024-08-13 14:57:45 -04:00 committed by GitHub
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6 changed files with 269 additions and 206 deletions
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330
vllm/model_executor/layers/fused_moe/layer.py
View File

@ -24,15 +24,9 @@ class FusedMoEMethodBase(QuantizeMethodBase):
raise NotImplementedError
@abstractmethod
def apply(self,
layer: torch.nn.Module,
x: torch.Tensor,
router_logits: torch.Tensor,
top_k: int,
renormalize: bool = True,
use_grouped_topk: bool = False,
num_expert_group: Optional[int] = None,
topk_group: Optional[int] = None) -> torch.Tensor:
def apply(self, layer: torch.nn.Module, x: torch.Tensor,
router_logits: torch.Tensor, top_k: int, renormalize: bool,
use_grouped_topk: bool) -> torch.Tensor:
raise NotImplementedError
@ -61,66 +55,78 @@ class UnquantizedFusedMoEMethod(FusedMoEMethodBase, CustomOp):
layer.register_parameter("w2_weight", w2_weight)
set_weight_attrs(w2_weight, extra_weight_attrs)
def apply(
self,
layer: torch.nn.Module,
x: torch.Tensor,
router_logits: torch.Tensor,
top_k: int,
renormalize: bool = True,
use_grouped_topk: bool = False,
num_expert_group: Optional[int] = None,
topk_group: Optional[int] = None,
) -> torch.Tensor:
return self.forward(x, layer.w13_weight, layer.w2_weight,
router_logits, top_k, renormalize,
use_grouped_topk, num_expert_group, topk_group)
def apply(self,
layer: torch.nn.Module,
x: torch.Tensor,
router_logits: torch.Tensor,
top_k: int,
renormalize: bool,
use_grouped_topk: bool,
topk_group: Optional[int] = None,
num_expert_group: Optional[int] = None) -> torch.Tensor:
def forward_cuda(
self,
x: torch.Tensor,
w1: torch.Tensor,
w2: torch.Tensor,
router_logits: torch.Tensor,
top_k: int,
renormalize: bool,
use_grouped_topk: bool,
num_expert_group: Optional[int],
topk_group: Optional[int],
) -> torch.Tensor:
from vllm.model_executor.layers.fused_moe.fused_moe import fused_moe
return fused_moe(x,
w1,
w2,
router_logits,
top_k,
renormalize=renormalize,
inplace=True,
use_grouped_topk=use_grouped_topk,
num_expert_group=num_expert_group,
topk_group=topk_group)
return self.forward(x=x,
layer=layer,
router_logits=router_logits,
top_k=top_k,
renormalize=renormalize,
use_grouped_topk=use_grouped_topk,
topk_group=topk_group,
num_expert_group=num_expert_group)
def forward_cuda(self,
layer: torch.nn.Module,
x: torch.Tensor,
use_grouped_topk: bool,
top_k: int,
router_logits: torch.Tensor,
renormalize: bool,
topk_group: Optional[int] = None,
num_expert_group: Optional[int] = None) -> torch.Tensor:
from vllm.model_executor.layers.fused_moe.fused_moe import (
fused_experts)
topk_weights, topk_ids = FusedMoE.select_experts(
hidden_states=x,
router_logits=router_logits,
use_grouped_topk=use_grouped_topk,
top_k=top_k,
renormalize=renormalize,
topk_group=topk_group,
num_expert_group=num_expert_group)
return fused_experts(hidden_states=x,
w1=layer.w13_weight,
w2=layer.w2_weight,
topk_weights=topk_weights,
topk_ids=topk_ids,
inplace=True)
def forward_cpu(self, *args, **kwargs):
raise NotImplementedError(
"The CPU backend currently does not support MoE.")
def forward_tpu(
self,
x: torch.Tensor,
w1: torch.Tensor,
w2: torch.Tensor,
router_logits: torch.Tensor,
top_k: int,
renormalize: bool,
use_grouped_topk: bool,
num_expert_group: Optional[int],
topk_group: Optional[int],
) -> torch.Tensor:
def forward_tpu(self,
layer: torch.nn.Module,
x: torch.Tensor,
use_grouped_topk: bool,
top_k: int,
router_logits: torch.Tensor,
renormalize: bool,
topk_group: Optional[int] = None,
num_expert_group: Optional[int] = None) -> torch.Tensor:
from vllm.model_executor.layers.fused_moe.moe_pallas import fused_moe
assert not use_grouped_topk
assert num_expert_group is None
assert topk_group is None
return fused_moe(x, w1, w2, router_logits, top_k, renormalize)
return fused_moe(hidden_states=x,
w1=layer.w13_weight,
w2=layer.w2_weight,
topk=top_k,
gating_output=router_logits,
renormalize=renormalize)
class FusedMoE(torch.nn.Module):
@ -195,7 +201,126 @@ class FusedMoE(torch.nn.Module):
def weight_loader(self, param: torch.nn.Parameter,
loaded_weight: torch.Tensor, weight_name: str,
shard_id: int, expert_id: int):
shard_id: str, expert_id: int) -> None:
if shard_id not in ("w1", "w2", "w3"):
raise ValueError(f"shard_id must be ['w1','w2','w3'] but "
f"got {shard_id}.")
# Special case for fp8 scales.
if getattr(param, "is_fp8_scale", False):
self._load_fp8_scale(param.data, loaded_weight, weight_name,
shard_id, expert_id)
return
expert_data = param.data[expert_id]
tp_rank = get_tensor_model_parallel_rank()
# If transposed, weight is saved as [input_dim, output_dim]
# Otherwise, weight is saved as [output_dim, input_dim]
# Default is not transposed/input dim is dim 1
input_dim = getattr(param, "input_dim", 1)
output_dim = getattr(param, "output_dim", 0)
# Index the loaded weight for tp sharding.
# down_proj: "RowParallel" so tp sharding on input_dim
if shard_id == "w2":
shard_dim = input_dim
shard_size = expert_data.shape[shard_dim]
# gate_up_proj: "MergedColumnParallel", so tp sharding on output_dim
elif shard_id in ("w1", "w3"):
shard_dim = output_dim
shard_size = expert_data.shape[output_dim] // 2
offset = shard_size * tp_rank
loaded_weight = loaded_weight.narrow(shard_dim, offset, shard_size)
# Narrow parameter and load.
# w1, gate_proj: Load into first logical weight of w13.
if shard_id == "w1":
expert_data = expert_data.narrow(shard_dim, 0, shard_size)
expert_data.copy_(loaded_weight)
# w3, up_proj: Load into second logical weight of w13.
elif shard_id == "w3":
expert_data = expert_data.narrow(shard_dim, shard_size, shard_size)
expert_data.copy_(loaded_weight)
# w2, down_proj: Load into only logical weight of w2.
elif shard_id == "w2":
expert_data.copy_(loaded_weight)
else:
raise ValueError(
f"Expected shard_id w1,w2 or w3 but got {shard_id}")
@staticmethod
def select_experts(hidden_states: torch.Tensor,
router_logits: torch.Tensor,
top_k: int,
use_grouped_topk: bool,
renormalize: bool,
topk_group: Optional[int] = None,
num_expert_group: Optional[int] = None):
from vllm.model_executor.layers.fused_moe.fused_moe import (
fused_topk, grouped_topk)
# DeekSeekv2 uses grouped_top_k
if use_grouped_topk:
assert topk_group is not None
assert num_expert_group is not None
topk_weights, topk_ids = grouped_topk(
hidden_states=hidden_states,
gating_output=router_logits,
topk=top_k,
renormalize=renormalize,
num_expert_group=num_expert_group,
topk_group=topk_group)
else:
topk_weights, topk_ids = fused_topk(hidden_states=hidden_states,
gating_output=router_logits,
topk=top_k,
renormalize=renormalize)
return topk_weights, topk_ids
def forward(self, hidden_states: torch.Tensor,
router_logits: torch.Tensor):
assert self.quant_method is not None
# Matrix multiply.
final_hidden_states = self.quant_method.apply(
layer=self,
x=hidden_states,
router_logits=router_logits,
top_k=self.top_k,
renormalize=self.renormalize,
use_grouped_topk=self.use_grouped_topk,
topk_group=self.topk_group,
num_expert_group=self.num_expert_group)
if self.reduce_results and self.tp_size > 1:
final_hidden_states = tensor_model_parallel_all_reduce(
final_hidden_states)
return final_hidden_states
@classmethod
def make_expert_params_mapping(
cls, ckpt_gate_proj_name: str, ckpt_down_proj_name: str,
ckpt_up_proj_name: str,
num_experts: int) -> List[Tuple[str, str, int, str]]:
return [
# (param_name, weight_name, expert_id, shard_id)
("experts.w13_" if weight_name
in [ckpt_gate_proj_name, ckpt_up_proj_name] else "experts.w2_",
f"experts.{expert_id}.{weight_name}.", expert_id, shard_id)
for expert_id in range(num_experts) for shard_id, weight_name in [
("w1", ckpt_gate_proj_name),
("w2", ckpt_down_proj_name),
("w3", ckpt_up_proj_name),
]
]
def _load_fp8_scale(self, param: torch.nn.Parameter,
loaded_weight: torch.Tensor, weight_name: str,
shard_id: str, expert_id: int) -> None:
param_data = param.data
# Input scales can be loaded directly and should be equal.
@ -210,92 +335,11 @@ class FusedMoE(torch.nn.Module):
# Weight scales
elif "weight_scale" in weight_name:
# If we are in merged column case (gate_up_proj)
# shard_id 0 == gate_proj / w1
# shard_id 2 == up_proj / w3
if shard_id == 0 or shard_id == 2:
if shard_id in ("w1", "w3"):
# We have to keep the weight scales of w1 and w3 because
# we need to re-quantize w1/w3 weights after weight loading.
idx = 0 if shard_id == 0 else 1
idx = 0 if shard_id == "w1" else 1
param_data[expert_id][idx] = loaded_weight
# If we are in the row parallel case (down_proj)
# shard_id 1 == down_proj / w2
else:
param_data[expert_id] = loaded_weight
# Weights
else:
tp_rank = get_tensor_model_parallel_rank()
shard_size = self.intermediate_size_per_partition
shard = slice(tp_rank * shard_size, (tp_rank + 1) * shard_size)
# w1, gate_proj case: Load into first shard of w13.
if shard_id == 0:
param_data[expert_id,
0:shard_size, :] = loaded_weight[shard, :]
# w3, up_proj case: Load into second shard of w13.
elif shard_id == 2:
param_data[expert_id, shard_size:2 *
shard_size, :] = loaded_weight[shard, :]
# w2, down_proj case: Load into only shard of w2.
elif shard_id == 1:
param_data[expert_id, :, :] = loaded_weight[:, shard]
else:
raise ValueError(
f"Shard id must be in [0,1,2] but got {shard_id}")
def forward(self, hidden_states: torch.Tensor,
router_logits: torch.Tensor):
assert self.quant_method is not None
# Matrix multiply.
final_hidden_states = self.quant_method.apply(
self,
x=hidden_states,
router_logits=router_logits,
top_k=self.top_k,
renormalize=self.renormalize,
use_grouped_topk=self.use_grouped_topk,
num_expert_group=self.num_expert_group,
topk_group=self.topk_group)
if self.reduce_results and self.tp_size > 1:
final_hidden_states = tensor_model_parallel_all_reduce(
final_hidden_states)
return final_hidden_states
@classmethod
def make_expert_params_mapping(
cls, ckpt_gate_proj_name: str, ckpt_down_proj_name: str,
ckpt_up_proj_name: str,
num_experts: int) -> List[Tuple[str, str, int, int]]:
gate_up = [ckpt_gate_proj_name, ckpt_up_proj_name]
gate_down_up = [
ckpt_gate_proj_name, ckpt_down_proj_name, ckpt_up_proj_name
]
return [
# These are the weight scales for the experts
# (param_name, weight_name, expert_id, shard_id)
("experts.w13_scale"
if weight_name in gate_up else "experts.w2_scale",
f"experts.{expert_id}.{weight_name}.weight_scale", expert_id,
shard_id) for expert_id in range(num_experts)
for shard_id, weight_name in enumerate(gate_down_up)
] + [
# These are the weights for the experts
# (param_name, weight_name, expert_id, shard_id)
("experts.w13_weight"
if weight_name in gate_up else "experts.w2_weight",
f"experts.{expert_id}.{weight_name}.weight", expert_id, shard_id)
for expert_id in range(num_experts)
for shard_id, weight_name in enumerate(gate_down_up)
] + [
# These are the weight scales for the experts
# (param_name, weight_name, expert_id, shard_id)
("experts.a13_scale"
if weight_name in gate_up else "experts.a2_scale",
f"experts.{expert_id}.{weight_name}.input_scale", expert_id,
shard_id) for expert_id in range(num_experts)
for shard_id, weight_name in enumerate(gate_down_up)
]

137
vllm/model_executor/layers/quantization/fp8.py
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@ -290,23 +290,29 @@ class Fp8MoEMethod(FusedMoEMethodBase):
# WEIGHT_SCALES
# Allocate 2 scales for w1 and w3 respectively.
# They will be combined to a single scale after weight loading.
w13_scale = torch.nn.Parameter(torch.ones(num_experts,
2,
dtype=torch.float32),
requires_grad=False)
layer.register_parameter("w13_scale", w13_scale)
w13_weight_scale = torch.nn.Parameter(torch.ones(num_experts,
2,
dtype=torch.float32),
requires_grad=False)
layer.register_parameter("w13_weight_scale", w13_weight_scale)
w2_scale = torch.nn.Parameter(torch.ones(num_experts,
dtype=torch.float32),
requires_grad=False)
layer.register_parameter("w2_scale", w2_scale)
w2_weight_scale = torch.nn.Parameter(torch.ones(num_experts,
dtype=torch.float32),
requires_grad=False)
layer.register_parameter("w2_weight_scale", w2_weight_scale)
# If loading fp8 checkpoint, pass the weight loaders.
# If loading an fp16 checkpoint, do not (we will quantize in
# process_weights_after_loading()
if self.quant_config.is_checkpoint_fp8_serialized:
set_weight_attrs(w13_scale, extra_weight_attrs)
set_weight_attrs(w2_scale, extra_weight_attrs)
set_weight_attrs(w13_weight_scale, {
"is_fp8_scale": True,
**extra_weight_attrs
})
set_weight_attrs(w2_weight_scale, {
"is_fp8_scale": True,
**extra_weight_attrs
})
# INPUT_SCALES
if self.quant_config.activation_scheme == "static":
@ -315,20 +321,26 @@ class Fp8MoEMethod(FusedMoEMethodBase):
"Found static activation scheme for checkpoint that "
"was not serialized fp8.")
a13_scale = torch.nn.Parameter(torch.ones(num_experts,
dtype=torch.float32),
requires_grad=False)
layer.register_parameter("a13_scale", a13_scale)
set_weight_attrs(a13_scale, extra_weight_attrs)
w13_input_scale = torch.nn.Parameter(torch.ones(
num_experts, dtype=torch.float32),
requires_grad=False)
layer.register_parameter("w13_input_scale", w13_input_scale)
set_weight_attrs(w13_input_scale, {
"is_fp8_scale": True,
**extra_weight_attrs
})
a2_scale = torch.nn.Parameter(torch.ones(num_experts,
dtype=torch.float32),
requires_grad=False)
layer.register_parameter("a2_scale", a2_scale)
set_weight_attrs(a2_scale, extra_weight_attrs)
w2_input_scale = torch.nn.Parameter(torch.ones(
num_experts, dtype=torch.float32),
requires_grad=False)
layer.register_parameter("w2_input_scale", w2_input_scale)
set_weight_attrs(w2_input_scale, {
"is_fp8_scale": True,
**extra_weight_attrs
})
else:
layer.a13_scale = None
layer.a2_scale = None
layer.w13_input_scale = None
layer.w2_input_scale = None
def process_weights_after_loading(self, layer: Module) -> None:
@ -341,16 +353,16 @@ class Fp8MoEMethod(FusedMoEMethodBase):
# Re-initialize w13_scale because we directly quantize
# merged w13 weights and generate a single scaling factor.
layer.w13_scale = torch.nn.Parameter(torch.ones(
layer.w13_weight_scale = torch.nn.Parameter(torch.ones(
layer.num_experts,
dtype=torch.float32,
device=w13_weight.device),
requires_grad=False)
requires_grad=False)
for expert in range(layer.num_experts):
w13_weight[expert, :, :], layer.w13_scale[
w13_weight[expert, :, :], layer.w13_weight_scale[
expert] = ops.scaled_fp8_quant(
layer.w13_weight.data[expert, :, :])
w2_weight[expert, :, :], layer.w2_scale[
w2_weight[expert, :, :], layer.w2_weight_scale[
expert] = ops.scaled_fp8_quant(
layer.w2_weight.data[expert, :, :])
layer.w13_weight = torch.nn.Parameter(w13_weight,
@ -366,40 +378,41 @@ class Fp8MoEMethod(FusedMoEMethodBase):
# Fp8 moe kernels require a single activation scale.
# We take the max of all the scales in case they differ.
if self.quant_config.activation_scheme == "static":
if layer.a13_scale is None or layer.a2_scale is None:
if (layer.w13_input_scale is None
or layer.w2_input_scale is None):
raise ValueError(
"QuantConfig has static quantization, but found "
"activation scales are None.")
if (not all_close_1d(layer.a13_scale)
or not all_close_1d(layer.a2_scale)):
if (not all_close_1d(layer.w13_input_scale)
or not all_close_1d(layer.w2_input_scale)):
print_warning_once(
"Found input_scales that are not equal for "
"fp8 MoE layer. Using the maximum across experts "
"for each layer. ")
layer.a13_scale = torch.nn.Parameter(layer.a13_scale.max(),
requires_grad=False)
layer.a2_scale = torch.nn.Parameter(layer.a2_scale.max(),
requires_grad=False)
layer.w13_input_scale = torch.nn.Parameter(
layer.w13_input_scale.max(), requires_grad=False)
layer.w2_input_scale = torch.nn.Parameter(
layer.w2_input_scale.max(), requires_grad=False)
# Fp8 moe kernel needs single weight scale for w13 per expert.
# We take the max then dequant and requant each expert.
assert layer.w13_scale is not None
assert layer.w13_weight_scale is not None
shard_size = layer.intermediate_size_per_partition
max_w13_scales = layer.w13_scale.max(dim=1).values
max_w13_scales = layer.w13_weight_scale.max(dim=1).values
for expert_id in range(layer.num_experts):
start = 0
for shard_id in range(2):
dq_weight = per_tensor_dequantize(
layer.w13_weight[expert_id][start:start +
shard_size, :],
layer.w13_scale[expert_id][shard_id])
layer.w13_weight_scale[expert_id][shard_id])
layer.w13_weight[expert_id][
start:start + shard_size, :], _ = ops.scaled_fp8_quant(
dq_weight, max_w13_scales[expert_id])
start += shard_size
layer.w13_scale = torch.nn.Parameter(max_w13_scales,
requires_grad=False)
layer.w13_weight_scale = torch.nn.Parameter(max_w13_scales,
requires_grad=False)
return
def apply(self,
@ -407,27 +420,33 @@ class Fp8MoEMethod(FusedMoEMethodBase):
x: torch.Tensor,
router_logits: torch.Tensor,
top_k: int,
renormalize: bool = True,
use_grouped_topk: bool = False,
num_expert_group: Optional[int] = None,
topk_group: Optional[int] = None) -> torch.Tensor:
renormalize: bool,
use_grouped_topk: bool,
topk_group: Optional[int] = None,
num_expert_group: Optional[int] = None) -> torch.Tensor:
from vllm.model_executor.layers.fused_moe import fused_moe
return fused_moe(x,
layer.w13_weight,
layer.w2_weight,
router_logits,
top_k,
renormalize=renormalize,
inplace=True,
use_fp8=True,
w1_scale=layer.w13_scale,
w2_scale=layer.w2_scale,
a1_scale=layer.a13_scale,
a2_scale=layer.a2_scale,
use_grouped_topk=use_grouped_topk,
num_expert_group=num_expert_group,
topk_group=topk_group)
from vllm.model_executor.layers.fused_moe import fused_experts
topk_weights, topk_ids = FusedMoE.select_experts(
hidden_states=x,
router_logits=router_logits,
use_grouped_topk=use_grouped_topk,
top_k=top_k,
renormalize=renormalize,
topk_group=topk_group,
num_expert_group=num_expert_group)
return fused_experts(x,
layer.w13_weight,
layer.w2_weight,
topk_weights=topk_weights,
topk_ids=topk_ids,
inplace=True,
use_fp8=True,
w1_scale=layer.w13_weight_scale,
w2_scale=layer.w2_weight_scale,
a1_scale=layer.w13_input_scale,
a2_scale=layer.w2_input_scale)
class Fp8KVCacheMethod(BaseKVCacheMethod):

2
vllm/model_executor/models/deepseek_v2.py
View File

@ -593,7 +593,7 @@ class DeepseekV2ForCausalLM(nn.Module):
weight_loader = param.weight_loader
weight_loader(param,
loaded_weight,
weight_name,
name,
shard_id=shard_id,
expert_id=expert_id)
break

2
vllm/model_executor/models/jamba.py
View File

@ -930,7 +930,7 @@ class JambaForCausalLM(nn.Module, HasInnerState):
weight_loader = param.weight_loader
weight_loader(param,
loaded_weight,
weight_name,
name,
shard_id=shard_id,
expert_id=expert_id)
break

2
vllm/model_executor/models/mixtral.py
View File

@ -455,7 +455,7 @@ class MixtralForCausalLM(nn.Module, SupportsLoRA):
weight_loader = param.weight_loader
weight_loader(param,
loaded_weight,
weight_name,
name,
shard_id=shard_id,
expert_id=expert_id)
break

2
vllm/model_executor/models/qwen2_moe.py
View File

@ -492,7 +492,7 @@ class Qwen2MoeForCausalLM(nn.Module):
weight_loader = param.weight_loader
weight_loader(param,
loaded_weight,
weight_name,
name,
shard_id=shard_id,
expert_id=expert_id)
break