MusicGen Stereo Large — MLX conversion

Upstream model by Jade Copet, Felix Kreuk, Itai Gat, Tal Remez, David Kant,
Gabriel Synnaeve, Yossi Adi and Alexandre Défossez.
Copyright (c) Meta Platforms, Inc. and affiliates

Licensed under the Creative Commons Attribution-NonCommercial 4.0 International
(CC-BY-NC-4.0).
Licence text: LICENSE (also at https://creativecommons.org/licenses/by-nc/4.0/)
Upstream: https://huggingface.co/facebook/musicgen-stereo-large

NON-COMMERCIAL LICENCE
----------------------
These weights may NOT be used for commercial purposes. The licence permits use
that is not primarily intended for or directed towards commercial advantage or
monetary compensation. Converting the weights to MLX does not change that: this
mirror carries the same restriction as upstream.

Modifications
-------------
These weights are a modified version of the upstream checkpoint, converted to
the MLX array format for inference on Apple silicon. Specifically: convolution
weights are transposed where MLX's layout differs from PyTorch's, tensors are
re-serialised as safetensors, weight keys are remapped to match this project's
module names, and the text encoder is split into a separate file. The model is
re-implemented against MLX rather than PyTorch.

No weights are retrained or fine-tuned.

Tensor precision is unchanged: the upstream checkpoint already stores float16
and so does this conversion. No weight value is altered by rounding — the
float16 storage is upstream's choice, not a reduction introduced here.

Bundled third-party components
------------------------------
This repository also redistributes the following, each under its own terms:

* T5 text encoder
    Upstream: https://huggingface.co/google-t5/t5-base
    Licence:  Apache-2.0
    Holder:   Google LLC
    Files:    t5.safetensors, t5_config.json, tokenizer.json, tokenizer_config.json
    Licence text: LICENSE.t5-apache-2.0

Where component licences differ, the most restrictive term governs the
repository as a whole. That is CC-BY-NC-4.0 here.

This conversion is distributed by the mlx-audiogen project
(https://github.com/jasonvassallo/mlx-audiogen), which is itself Apache-2.0.
That licence covers the conversion code only — these weights remain governed by
the Creative Commons Attribution-NonCommercial 4.0 International above.