Revert "update utils"

This reverts commit 270b87b.

Author: gcanlin

tests/e2e/model_utils.py

@@ -17,7 +17,6 @@
 # Adapted from vllm-project/vllm/blob/main/tests/models/utils.py
 #
 
-from difflib import SequenceMatcher
 from typing import Dict, List, Optional, Sequence, Tuple, Union
 
 from vllm.logprobs import PromptLogprobs, SampleLogprobs
@@ -53,36 +52,6 @@ def check_outputs_equal(
         assert output_ids_0 == output_ids_1, fail_msg
 
 
-def check_outputs_similar(
-    *,
-    outputs_0_lst: Sequence[TokensText],
-    outputs_1_lst: Sequence[TokensText],
-    name_0: str,
-    name_1: str,
-    similarity_threshold: float = 0.75,
-):
-    """
-    Compare two sequences allowing for minor differences due to numerical precision.
-    Uses text similarity ratio instead of exact matching.
-    """
-    assert len(outputs_0_lst) == len(outputs_1_lst)
-
-    for prompt_idx, (outputs_0,
-                     outputs_1) in enumerate(zip(outputs_0_lst,
-                                                 outputs_1_lst)):
-        output_ids_0, output_str_0 = outputs_0
-        output_ids_1, output_str_1 = outputs_1
-
-        similarity = SequenceMatcher(None, output_str_0, output_str_1).ratio()
-
-        fail_msg = (
-            f"Test{prompt_idx}: Similarity {similarity:.2%} < {similarity_threshold:.0%}\n"
-            f"{name_0}:\t{output_str_0!r}\n"
-            f"{name_1}:\t{output_str_1!r}")
-
-        assert similarity >= similarity_threshold, fail_msg
-
-
 # Representation of generated sequence as a tuple of
 # * Token ID list
 # * String