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Anush008 / fastembed-rs

Library for generating vector embeddings, reranking in Rust
https://docs.rs/fastembed
Apache License 2.0
285 stars 41 forks source link

refactor: Use hardcoding of `last_hidden_state` only if multiple output nodes exist #82

Closed lawrenceadams closed 4 months ago

lawrenceadams commented 4 months ago

This PR changes the behaviour of the get_model_info function to try to use the only output node available. If there are multiple, then default to last_hidden_state as per previous behaviour.

Allows easier use of the library with ONNX models from disparate sources.

Resolves #81

Summary by CodeRabbit

coderabbitai[bot] commented 4 months ago

Walkthrough

The TextEmbedding module in src/text_embedding.rs has been enhanced to support models exported by Optimum by dynamically selecting the output key. If multiple keys are present, it defaults to last_hidden_state. This modification ensures compatibility with ONNX models that use different output layers, such as logits.

Changes

Files Change Summary
src/text_embedding.rs Modified impl TextEmbedding to support dynamic key retrieval, defaulting to last_hidden_state when multiple output keys are present.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant TextEmbedding
    participant ONNXModel

    User ->> TextEmbedding: Request embedding
    TextEmbedding ->> ONNXModel: Run inference
    ONNXModel -->> TextEmbedding: Output with multiple keys
    TextEmbedding ->> TextEmbedding: Check for multiple keys
    alt Multiple keys
        TextEmbedding ->> TextEmbedding: Default to `last_hidden_state`
    end
    TextEmbedding ->> User: Return embedding

Assessment against linked issues

Objective Addressed Explanation
Unable to use ONNX model exported by Optimum (#81) ✅
Support for models with different last layer names (e.g., logits) ✅

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github-actions[bot] commented 4 months ago

:tada: This issue has been resolved in version 3.9.1 :tada:

The release is available on:

Your semantic-release bot :package::rocket: