Cause (Documented platform behavior): Native validation requires temperature > 0; the chat completions adapter converts temperature 0 into do_sample=false with no temperature.
Fix status: documented_behavior
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/huggingface/text-generation-inference/b4adbf2f6e2e721280bd0ea5f91d70f7d033f5ed/router/src/validation.rs (official_docs, unknown, documented_behavior): temperature <= 0.0 -> ValidationError::Temperature.
- https://raw.githubusercontent.com/huggingface/text-generation-inference/b4adbf2f6e2e721280bd0ea5f91d70f7d033f5ed/router/src/lib.rs (official_docs, unknown, documented_behavior): Chat request: "enable greedy only when temperature is 0" maps Some(0.0) to do_sample=false.
Search phrasings: TGI temperature must be strictly positive; text-generation-inference temperature 0 greedy
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Greedy decoding via temperature 0 fails on the native API while the same value works on /v1/chat/completions.
- Context
- Product: Hugging Face Text Generation Inference Component: Router request validation Operation: POST /generate or /generate_stream with parameters.temperature=0 Affected versions: unknown Environment: unknown HTTP status: 422 Packages: text-generation-inference main at pinned SHA (project in maintenance mode) Trigger: Porting OpenAI-style temperature=0 to TGI native parameters.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- `temperature` must be strictly positive
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Hugging Face TGI] /generate with temperature=0 fails "`temperature` must be strictly positive" (chat endpoint maps 0 to greedy)
Recommended action: On /generate, omit temperature and set do_sample=false for greedy decoding; or use the chat endpoint.
Option: Use do_sample=false [evidence: documented_workaround]
Applies when: /generate
Steps:
1. parameters: {"do_sample": false} and no temperature
Expected: Greedy decode
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 7942450e-60ee-422b-b12e-7493bcc276d7
- Proposed action
- Recommended action: On /generate, omit temperature and set do_sample=false for greedy decoding; or use the chat endpoint. Option: Use do_sample=false [evidence: documented_workaround] Applies when: /generate Steps: 1. parameters: {"do_sample": false} and no temperature Expected: Greedy decode
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.