wehub-resource-sync
67 lines
2.6 KiB
Python
67 lines
2.6 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
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"""Unit tests for LogprobsProcessor.
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These tests exercise the truncation invariant that the MRV2 sampler relies
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on: when the sampler returns a row wider than a request's own
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`num_logprobs + 1` (because another request in the batch needed a wider
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row), the trailing positions are populated with sentinel values
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(`token_id=0`, `logprob=-inf`). LogprobsProcessor must read only the first
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`num_logprobs + 1` entries so those sentinels never reach the user.
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"""
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import numpy as np
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from vllm.logprobs import create_sample_logprobs
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from vllm.v1.engine.logprobs import LogprobsProcessor
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from vllm.v1.outputs import LogprobsLists
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def _make_processor(num_logprobs: int) -> LogprobsProcessor:
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return LogprobsProcessor(
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tokenizer=None,
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logprobs=create_sample_logprobs(flat_logprobs=False),
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prompt_logprobs=None,
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cumulative_logprob=0.0,
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num_logprobs=num_logprobs,
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num_prompt_logprobs=None,
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)
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def test_drops_trailing_sentinel_columns():
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"""A request that asked for 3 custom token logprobs but ended up in a
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batch padded to width 5 must not surface the trailing -inf entries."""
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processor = _make_processor(num_logprobs=3)
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sampled = 42
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# Layout: [sampled, custom_1, custom_2, custom_3, SENTINEL, SENTINEL]
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# Use float32-exact values so cumulative_logprob compares cleanly.
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token_ids = np.array([[sampled, 100, 200, 300, 0, 0]], dtype=np.int32)
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logprobs = np.array([[-0.5, -1.0, -2.0, -3.0, -np.inf, -np.inf]], dtype=np.float32)
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ranks = np.array([1], dtype=np.int32)
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processor._update_sample_logprobs(LogprobsLists(token_ids, logprobs, ranks))
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assert len(processor.logprobs) == 1
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pos = processor.logprobs[0]
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# Exactly sampled + 3 requested tokens; trailing sentinels dropped.
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assert set(pos.keys()) == {sampled, 100, 200, 300}
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assert 0 not in pos
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assert all(np.isfinite(lp.logprob) for lp in pos.values())
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# cumulative_logprob comes from the sampled token's logprob only.
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assert processor.cumulative_logprob == -0.5
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def test_accepts_exactly_sized_row():
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"""When the row is exactly num_logprobs+1, no truncation needed."""
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processor = _make_processor(num_logprobs=2)
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token_ids = np.array([[7, 11, 13]], dtype=np.int32)
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logprobs = np.array([[-0.5, -1.5, -2.5]], dtype=np.float32)
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ranks = np.array([1], dtype=np.int32)
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processor._update_sample_logprobs(LogprobsLists(token_ids, logprobs, ranks))
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pos = processor.logprobs[0]
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assert set(pos.keys()) == {7, 11, 13}
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