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Support s1 #53

@EndlessReform

Description

@EndlessReform

Add support for FishOpenAudio's new s1-mini model. Fortunately, most of the changes seem to be on the data and post-training side.

Architectural changes since Fish 1.5:

  • New DAC codec: .This will probably be most of the work for the PR. Fortunately there's an existing candle.rs DAC implementation, so hopefully this shouldn't be too hard. Unfortunately this codec is still non-causal, so generation will still be blocking
  • No changes to RQTransformer.

Work to do:

  • Convert checkpoint to .safetensors format
  • Port DAC codec

PR might take a bit longer since the repo is badly in need of cleanup.

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