Fix pre-norm weight conversion for nmt #1723
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Hi @Pzzzzz5142 thanks for you contributing, we'll evaluate your changes internal firstly. |
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hi @Pzzzzz5142 ， thanks for your contribution, this PR has been merged and will upstream to main branch next week, |
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For nmt model, if it uses pre-norm architecture, then it will have final layernorm. (Ref: fairseq encoder init, forward and fairseq decoder init, forward).
We don't need to modify the rest of the script since fairseq will use the original
final_layer_normbefore ffn despite they call itfinal_layer_norm. (Ref: https://github.com/facebookresearch/fairseq/blob/main/fairseq/modules/transformer_layer.py#L212)