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Transformers Model Integration Contracts

Tool Nov 3, 2026

Hugging Face's proposed testing format combining small frozen model fixtures, executable Markdown usage paths and human-reviewed output baselines.

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Hugging Face's MIC diagram separates small fixture checks on pull requests from real checkpoint tests and labels model-to-contract discovery and Transformers.js CI triggers as proposed or undefined.
Project-supplied MIC overview. The model-to-contract discovery link is proposed, and Transformers.js CI triggers remain to be defined; the diagram does not establish those integrations are shipped. Source: Hugging Face / transformers-mic contributors
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A Model Integration Contract packages a fixture built by shrinking a real checkpoint’s configuration, a runnable usage example and reviewed expected outputs. Tokenizer and processor files are preserved unchanged. The aim is a cheap regression signal on CPU before a change merges, while full checkpoints remain necessary for integration testing.

The tmic CLI can draft contracts through an LLM, build fixtures and record baselines for human review. The documented local-only workflow stops before upload, but drafting uses Hugging Face Inference Providers billed to the user’s account. As documented on November 2, 2026, Transformers’ contracts job reports failures without blocking pull requests. Passing a small fixture does not certify the real model.