[BugFix] Define __eq__ in SequenceGroupOutputs (#1389)

Author: WoosukKwon

vllm/sequence.py

@@ -401,6 +401,12 @@ def __repr__(self) -> str:
         return (f"SequenceGroupOutputs(samples={self.samples}, "
                 f"prompt_logprobs={self.prompt_logprobs})")
 
+    def __eq__(self, other: object) -> bool:
+        if not isinstance(other, SequenceGroupOutputs):
+            raise NotImplementedError()
+        return (self.samples == other.samples
+                and self.prompt_logprobs == other.prompt_logprobs)
+
 
 # For each sequence group, we generate a list of SequenceOutputs object,
 # each of which contains one possible candidate for the next token.