Node.js Incorrect output name mapping when using run() with a single output in fetches

[uasan]

Incorrect output name mapping when using run() with a single output in fetches

Description

When calling InferenceSession.run() with a single output specified in fetches, the returned output map contains incorrect keys.

Instead of returning the requested output name, the data is returned under a different output name, and the requested key is missing.

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Expected behavior

session.run(feeds, ['sentence_embedding'])

The result should contain:

• key: sentence_embedding
• value: pooled embedding tensor with shape [B, 768]

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Actual behavior

const res = await session.run(feeds, ['sentence_embedding']);

Returned result:

• keys: ['last_hidden_state']
• last_hidden_state.dims → [B, 768]
• sentence_embedding → undefined

The data for sentence_embedding is incorrectly returned under last_hidden_state.

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Control case (works correctly)

const res = await session.run(feeds);

Returned result:

• last_hidden_state.dims → [B, L, 768]
• sentence_embedding.dims → [B, 768]

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Notes

• Reproducible across multiple Node.js versions
• Reproducible across multiple onnxruntime-node versions
• Occurs when fetches is provided both as an array and as an object map