implement group-norm#790
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| BlockType = Literal["conv_next_block", "conv_block"] | ||
| ActivationType = Literal["relu", "gelu", "capped_gelu"] | ||
| NormType = Literal["batch", "instance", "layer"] | ||
| NormType = Literal["batch", "instance", "group", "nonorm", "layer"] |
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When a config sets core_block.block_type: "conv_block" with the newly accepted norm: "group" or "nonorm", validation now succeeds, but the BlockConfig.build conv_block branch still constructs ConvBlock without passing self.norm, and ConvBlock hard-codes BatchNorm2d. That silently runs experiments with batch norm despite the YAML requesting group/no normalization, so either reject these values for conv_block or thread the norm setting through that block too.
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implement group and layer normalization with tests. Change norm selection to use build_norm_layer that is more extensible than old if/elif logic.