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Error in model, scaling only q matrix not qK.T dot product (qk.T/sqrt(dim_per_head)) #357

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BenoitDalFerro
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As per Vaswani et al, 2017 p.4
Is torch.matmul(q, k.transpose(2, 3)) / math.sqrt(dim_per_head) not q / math.sqrt(dim_per_head) https://arxiv.org/pdf/1912.05372.pdf

…(dim_per_head)

As per Vaswani et al, 2017 p.4
Is torch.matmul(q, k.transpose(2, 3)) / math.sqrt(dim_per_head) not q / math.sqrt(dim_per_head)
https://arxiv.org/pdf/1912.05372.pdf
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BenoitDalFerro added a commit to BenoitDalFerro/transformers that referenced this pull request Feb 14, 2023
…t qk.T dot product (qk.T/sqrt(dim_per_head))

As per Vaswani et al, 2017 p.4 - https://arxiv.org/pdf/1912.05372.pdf
Is torch.matmul(q, k.transpose(2, 3)) / math.sqrt(dim_per_head) not q / math.sqrt(dim_per_head) 
This effectively scales queries only and not the queries-keys dot product as should be

Mentioned in
- original facebookresearch/XLM#357
- dependent original FlauBERT getalp/Flaubert@6d17688
- dependent Huggingface FlauBERT huggingface#21627
@facebook-github-bot facebook-github-bot added the CLA Signed Do not delete this pull request or issue due to inactivity. label Feb 14, 2023
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