[Bugfix] fix IntermediateTensors equal method (#23027)

Signed-off-by: Andy Xie <andy.xning@gmail.com>

tests/test_sequence.py

@@ -2,10 +2,11 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import pytest
+import torch
 
 from vllm.model_executor.layers.sampler import SamplerOutput
-from vllm.sequence import (CompletionSequenceGroupOutput, SequenceData,
-                           SequenceOutput)
+from vllm.sequence import (CompletionSequenceGroupOutput, IntermediateTensors,
+                           SequenceData, SequenceOutput)
 
 from .core.utils import create_dummy_prompt
 
@@ -98,3 +99,38 @@ def test_sequence_group_stage():
     assert seq_group.is_prefill() is True
     seq_group.update_num_computed_tokens(1)
     assert seq_group.is_prefill() is False
+
+
+def test_sequence_intermediate_tensors_equal():
+
+    class AnotherIntermediateTensors(IntermediateTensors):
+        pass
+
+    intermediate_tensors = IntermediateTensors({})
+    another_intermediate_tensors = AnotherIntermediateTensors({})
+    assert intermediate_tensors != another_intermediate_tensors
+
+    empty_intermediate_tensors_1 = IntermediateTensors({})
+    empty_intermediate_tensors_2 = IntermediateTensors({})
+    assert empty_intermediate_tensors_1 == empty_intermediate_tensors_2
+
+    different_key_intermediate_tensors_1 = IntermediateTensors(
+        {"1": torch.zeros([2, 4], dtype=torch.int32)})
+    difference_key_intermediate_tensors_2 = IntermediateTensors(
+        {"2": torch.zeros([2, 4], dtype=torch.int32)})
+    assert (different_key_intermediate_tensors_1
+            != difference_key_intermediate_tensors_2)
+
+    same_key_different_value_intermediate_tensors_1 = IntermediateTensors(
+        {"1": torch.zeros([2, 4], dtype=torch.int32)})
+    same_key_different_value_intermediate_tensors_2 = IntermediateTensors(
+        {"1": torch.zeros([2, 5], dtype=torch.int32)})
+    assert (same_key_different_value_intermediate_tensors_1
+            != same_key_different_value_intermediate_tensors_2)
+
+    same_key_same_value_intermediate_tensors_1 = IntermediateTensors(
+        {"1": torch.zeros([2, 4], dtype=torch.int32)})
+    same_key_same_value_intermediate_tensors_2 = IntermediateTensors(
+        {"1": torch.zeros([2, 4], dtype=torch.int32)})
+    assert (same_key_same_value_intermediate_tensors_1 ==
+            same_key_same_value_intermediate_tensors_2)

vllm/sequence.py

@@ -1163,7 +1163,13 @@ class IntermediateTensors:
         return len(self.tensors)
 
     def __eq__(self, other: object):
-        return isinstance(other, self.__class__) and self
+        if not isinstance(other, self.__class__):
+            return False
+        if self.tensors.keys() != other.tensors.keys():
+            return False
+        return all(
+            torch.equal(self.tensors[k], other.tensors[k])
+            for k in self.tensors)
 
     def __repr__(self) -> str:
         return f"IntermediateTensors(tensors={self.tensors})"