{"record":{"id":"96148bd20e176e71","repo":"sgl-project/sglang","slug":"min-p-must-be-in-0-1-got-self-min-p","errorCode":null,"errorMessage":"min_p must be in [0, 1], got {self.min_p}.","messagePattern":"min_p must be in \\[0, 1\\], got (.+?)\\.","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"python/sglang/srt/sampling/sampling_params.py","lineNumber":164,"sourceCode":"        # Process some special cases\n        if 0 <= self.temperature < _SAMPLING_EPS:\n            # top_k = 1 means greedy sampling\n            self.temperature = 1.0\n            self.top_k = 1\n        if self.top_k == -1:\n            self.top_k = TOP_K_ALL  # whole vocabulary\n\n    def verify(self, vocab_size):\n        if self.beam_width is not None and self.beam_width < 1:\n            raise ValueError(f\"beam_width must be at least 1, got {self.beam_width}.\")\n        if not math.isfinite(self.temperature) or self.temperature < 0.0:\n            raise ValueError(\n                f\"temperature must be a non-negative finite number, got {self.temperature}.\"\n            )\n        if not 0.0 < self.top_p <= 1.0:\n            raise ValueError(f\"top_p must be in (0, 1], got {self.top_p}.\")\n        if not 0.0 <= self.min_p <= 1.0:\n            raise ValueError(f\"min_p must be in [0, 1], got {self.min_p}.\")\n        if self.top_k < 1 or self.top_k == -1:\n            raise ValueError(\n                f\"top_k must be -1 (disable) or at least 1, got {self.top_k}.\"\n            )\n        if not -2.0 <= self.frequency_penalty <= 2.0:\n            raise ValueError(\n                \"frequency_penalty must be in [-2, 2], got \"\n                f\"{self.frequency_penalty}.\"\n            )\n        if not -2.0 <= self.presence_penalty <= 2.0:\n            raise ValueError(\n                \"presence_penalty must be in [-2, 2], got \" f\"{self.presence_penalty}.\"\n            )\n        if not 0.0 < self.repetition_penalty <= 2.0:\n            raise ValueError(\n                \"repetition_penalty must be in (0, 2] (1.0 = no penalty), \"\n                f\"got {self.repetition_penalty}.\"\n            )","sourceCodeStart":146,"sourceCodeEnd":182,"githubUrl":"https://github.com/sgl-project/sglang/blob/0132848349585cfe6aae51c4941cbae872505f8a/python/sglang/srt/sampling/sampling_params.py#L146-L182","documentation":"SamplingParams.verify() requires min_p to lie in [0, 1]. min_p is a minimum-probability threshold (relative to the top token's probability); values outside the unit interval are meaningless and raise this ValueError during normalize()/verify().","triggerScenarios":"Passing SamplingParams(min_p=-0.1) or min_p=1.2; verify() runs via normalize() on every request containing min_p.","commonSituations":"Tuning min_p from papers/blogs that use different scales (e.g. percent 0-100 instead of 0-1); arithmetic on min_p overshooting 1; confusing min_p with min_tokens or presence_penalty ranges.","solutions":["Keep min_p in [0, 1]; typical useful range is 0.0-0.3","If your value is a percentage, divide by 100 before passing","Set min_p=0.0 (or omit) to disable the filter"],"exampleFix":"# before\nparams = SamplingParams(min_p=15)  # percent scale, invalid\n# after\nparams = SamplingParams(min_p=0.15)","handlingStrategy":"validation","validationCode":"min_p = min_p if isinstance(min_p,(int,float)) and 0.0 <= min_p <= 1.0 else 0.0\nparams = SamplingParams(min_p=min_p)","typeGuard":"def valid_min_p(p):\n    return isinstance(p,(int,float)) and 0.0 <= p <= 1.0","tryCatchPattern":"try:\n    llm.generate(prompts, SamplingParams(min_p=p))\nexcept ValueError as e:\n    if 'min_p' in str(e):\n        p = 0.0\n    else:\n        raise","preventionTips":["Remember min_p uses a 0-1 scale, not percent","Default min_p to 0.0 (disabled) in configs"],"tags":["sampling-params","min-p","validation","sglang"],"backgroundTag":"sampling-parameter-validation-failed","analyzedSha":"0132848349585cfe6aae51c4941cbae872505f8a","analyzedAt":"2026-08-28T05:10:05.995Z","schemaVersion":2},"datasetVersion":"2026-08-28T06:17:29.519Z"}