granite4_vision: support standard granite MLP backbone for 4.1-4b#1104
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The granite-4.0-3b-vision uses a GraniteMoeHybrid backbone with a fused SharedMLP (input_linear/output_linear), while granite-vision-4.1-4b uses a standard Granite backbone with separate gate_proj/up_proj/down_proj weights. Add an MLP class for the standard variant and select between the two in TransformerBlock based on text_config.model_type. Co-Authored-By: Claude Sonnet 4.6 (1M context) <[email protected]>
…and unit tests for MLP and LanguageModel.
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The granite-4.0-3b-vision uses a GraniteMoeHybrid backbone with a fused SharedMLP (input_linear/output_linear), while granite-vision-4.1-4b uses a standard Granite backbone with separate gate_proj/up_proj/down_proj weights. Add an MLP class for the standard variant and select between the two in TransformerBlock based on text_config.model_type.