37efc63b64
Signed-off-by: Reza Barazesh <rezabarazesh@meta.com> Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com> Co-authored-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
83 lines
2.9 KiB
Python
83 lines
2.9 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
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import sys
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from contextlib import nullcontext
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from vllm_test_utils import BlameResult, blame
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from vllm import LLM, SamplingParams
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from vllm.distributed import cleanup_dist_env_and_memory
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from vllm.sampling_params import GuidedDecodingParams
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def run_normal():
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prompts = [
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"Hello, my name is",
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"The president of the United States is",
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"The capital of France is",
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"The future of AI is",
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]
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sampling_params = SamplingParams(temperature=0.8, top_p=0.95)
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# Create an LLM without guided decoding as a baseline.
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llm = LLM(model="distilbert/distilgpt2",
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enforce_eager=True,
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gpu_memory_utilization=0.3)
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outputs = llm.generate(prompts, sampling_params)
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for output in outputs:
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prompt = output.prompt
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generated_text = output.outputs[0].text
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print(f"Prompt: {prompt!r}, Generated text: {generated_text!r}")
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# Destroy the LLM object and free up the GPU memory.
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del llm
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cleanup_dist_env_and_memory()
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def run_xgrammar(sample_regex):
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# Create an LLM with guided decoding enabled.
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llm = LLM(model="distilbert/distilgpt2",
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enforce_eager=True,
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guided_decoding_backend="xgrammar",
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gpu_memory_utilization=0.3)
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prompt = f"Give an example IPv4 address with this regex: {sample_regex}"
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guided_decoding = GuidedDecodingParams(regex=sample_regex)
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sampling_params = SamplingParams(temperature=0.8,
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top_p=0.95,
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guided_decoding=guided_decoding)
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outputs = llm.generate(
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prompts=[prompt] * 2,
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sampling_params=sampling_params,
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use_tqdm=True,
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)
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for output in outputs:
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prompt = output.prompt
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generated_text = output.outputs[0].text
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print(f"Prompt: {prompt!r}, Generated text: {generated_text!r}")
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def test_lazy_outlines(sample_regex):
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"""If users don't use guided decoding, outlines should not be imported.
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"""
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# make sure outlines is not imported
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module_name = "outlines"
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# In CI, we only check finally if the module is imported.
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# If it is indeed imported, we can rerun the test with `use_blame=True`,
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# which will trace every function call to find the first import location,
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# and help find the root cause.
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# We don't run it in CI by default because it is slow.
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use_blame = False
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context = blame(
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lambda: module_name in sys.modules) if use_blame else nullcontext()
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with context as result:
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run_normal()
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run_xgrammar(sample_regex)
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if use_blame:
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assert isinstance(result, BlameResult)
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print(f"the first import location is:\n{result.trace_stack}")
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assert module_name not in sys.modules, (
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f"Module {module_name} is imported. To see the first"
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f" import location, run the test with `use_blame=True`.")
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