Add Gemma 4 Orbax checkpoint loading support to Tunix.#1553
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- New params.py loader that normalizes upstream Orbax checkpoint keys (both semi-flat and nested formats) to the Tunix NNX parameter layout, with multimodal parameter pruning and shape validation. - Comprehensive unit tests for key mapping, gating_einsum handling, and format parity. - Patch model.py __call__ to accept **kwargs for segment_ids compatibility with the RL sequence packing pipeline. - Register Gemma 4 in automodel.py. PiperOrigin-RevId: 924575535
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Add Gemma 4 Orbax checkpoint loading support to Tunix.
(both semi-flat and nested formats) to the Tunix NNX parameter layout,
with multimodal parameter pruning and shape validation.
format parity.
with the RL sequence packing pipeline.