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author | Gustaf Rydholm <gustaf.rydholm@gmail.com> | 2022-09-13 18:46:09 +0200 |
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committer | Gustaf Rydholm <gustaf.rydholm@gmail.com> | 2022-09-13 18:46:09 +0200 |
commit | 143d37636c4533a74c558ca5afb8a579af38de97 (patch) | |
tree | b6740ab7bb954ceea4a2e5e19b7f8553b0039e3c /text_recognizer/networks/transformer/axial_attention/self_attention.py | |
parent | fd9b1570c568d9ce8f1ac7258f05f9977a5cc9c8 (diff) |
Remove axial encoder
Diffstat (limited to 'text_recognizer/networks/transformer/axial_attention/self_attention.py')
-rw-r--r-- | text_recognizer/networks/transformer/axial_attention/self_attention.py | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/text_recognizer/networks/transformer/axial_attention/self_attention.py b/text_recognizer/networks/transformer/axial_attention/self_attention.py deleted file mode 100644 index b5e4142..0000000 --- a/text_recognizer/networks/transformer/axial_attention/self_attention.py +++ /dev/null @@ -1,40 +0,0 @@ -"""Axial self attention module.""" - -import torch -from torch import nn -from torch import Tensor - - -class SelfAttention(nn.Module): - """Axial self attention module.""" - - def __init__( - self, - dim: int, - dim_head: int, - heads: int, - ) -> None: - super().__init__() - self.dim_hidden = heads * dim_head - self.heads = heads - self.dim_head = dim_head - self.to_q = nn.Linear(dim, self.dim_hidden, bias=False) - self.to_kv = nn.Linear(dim, 2 * self.dim_hidden, bias=False) - self.to_out = nn.Linear(self.dim_hidden, dim) - - def forward(self, x: Tensor) -> Tensor: - """Applies self attention.""" - q, k, v = (self.to_q(x), *self.to_kv(x).chunk(2, dim=-1)) - b, _, d, h, e = *q.shape, self.heads, self.dim_head - - merge_heads = ( - lambda x: x.reshape(b, -1, h, e).transpose(1, 2).reshape(b * h, -1, e) - ) - q, k, v = map(merge_heads, (q, k, v)) - - energy = torch.einsum("bie,bje->bij", q, k) * (e ** -0.5) - energy = energy.softmax(dim=-1) - attn = torch.einsum("bij,bje->bie", energy, v) - - out = attn.reshape(b, h, -1, e).transpose(1, 2).reshape(b, -1, d) - return self.to_out(out) |