[bugfix] fix qwen3_omni position_ids dtype

[Jintao-Huang]

#7176

[gemini-code-assist]

Summary of Changes

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This pull request addresses a bug in the Qwen3-Omni model's position_ids generation. The change ensures that the position_ids are always of an integer data type (torch.int64), which is critical for their correct interpretation and use within the model. This fix prevents potential runtime errors or incorrect behavior that could arise from position_ids being inadvertently represented as floating-point numbers.

Highlights

• Bugfix: Qwen3-Omni position_ids dtype: Corrected a potential issue where position_ids for the Qwen3-Omni model might be a floating-point type by explicitly converting them to torch.int64 if they are detected as floating-point.

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[gemini-code-assist]

Code Review

This pull request addresses a bug where position_ids might have an incorrect floating-point data type, leading to potential issues. The change correctly converts position_ids to torch.int64 if it is detected as a floating-point tensor, ensuring the correct data type for subsequent operations. This is a straightforward and necessary fix.