1 files changed, 0 insertions, 109 deletions
diff --git a/text_recognizer/networks/transformer/attention.py b/text_recognizer/networks/transformer/attention.py
deleted file mode 100644
index 85f513e..0000000
--- a/text_recognizer/networks/transformer/attention.py
+++ /dev/null
@@ -1,109 +0,0 @@
-"""Implementes the attention module for the transformer."""
-from typing import Optional
-
-import torch
-import torch.nn.functional as F
-from einops import rearrange
-from torch import Tensor, einsum, nn
-
-from text_recognizer.networks.transformer.embeddings.rotary import (
-    RotaryEmbedding,
-)
-
-
-class Attention(nn.Module):
-    """Standard attention."""
-
-    def __init__(
-        self,
-        dim: int,
-        num_heads: int,
-        causal: bool = False,
-        dim_head: int = 64,
-        dropout_rate: float = 0.0,
-    ) -> None:
-        super().__init__()
-        self.dim = dim
-        self.scale = self.dim**-0.5
-        self.num_heads = num_heads
-        self.dim_head = dim_head
-
-        self.causal = causal
-        self.dropout_rate = dropout_rate
-
-        # Single key/value head
-        k_dim = dim_head
-        v_dim = dim_head
-
-        out_dim = self.num_heads * self.dim_head
-
-        self.to_q = nn.Linear(self.dim, out_dim, bias=False)
-        self.to_k = nn.Linear(self.dim, k_dim, bias=False)
-        self.to_v = nn.Linear(self.dim, v_dim, bias=False)
-
-        self.dropout = nn.Dropout(p=self.dropout_rate)
-
-        # Feedforward
-        self.fc = nn.Linear(out_dim, self.dim)
-
-    def forward(
-        self,
-        x: Tensor,
-        context: Optional[Tensor] = None,
-        mask: Optional[Tensor] = None,
-        rotary_embedding: Optional[RotaryEmbedding] = None,
-    ) -> Tensor:
-        """Computes the attention."""
-        b, device = x.shape[0], x.device
-
-        q = self.to_q(x)
-        q = rearrange(q, "b n (h d) -> b h n d", h=self.num_heads)
-        k = self.to_k(context) if context is not None else self.to_k(x)
-        v = self.to_v(context) if context is not None else self.to_v(x)
-
-        if rotary_embedding is not None:
-            q, k, v = map(lambda t: rotary_embedding.rotate(t), (q, k, v))
-
-        energy = einsum("b h i d, b j d -> b h i j", q, k) * self.scale
-        mask_value = -torch.finfo(energy.dtype).max
-        energy = apply_input_mask(b, k, energy, mask, mask_value, device)
-        if self.causal:
-            energy = apply_causal_mask(energy, mask, mask_value, device)
-
-        attn = F.softmax(energy, dim=-1)
-        attn = self.dropout(attn)
-        out = einsum("b h i j, b j d -> b h i d", attn, v)
-        out = rearrange(out, "b h n d -> b n (h d)")
-        out = self.fc(out)
-        return out
-
-
-def apply_input_mask(
-    b: int,
-    k: Tensor,
-    energy: Tensor,
-    mask: Optional[Tensor],
-    mask_value: Tensor,
-    device: str,
-) -> Tensor:
-    """Applies an input mask."""
-    if mask is not None:
-        k_mask = torch.ones((b, k.shape[-2]), device=device).bool()
-        q_mask = rearrange(mask, "b i -> b () i ()")
-        k_mask = rearrange(k_mask, "b j -> b () () j")
-        input_mask = q_mask * k_mask
-
-        energy = energy.masked_fill_(~input_mask, mask_value)
-    return energy
-
-
-def apply_causal_mask(
-    energy: Tensor, mask: Tensor, mask_value: Tensor, device: str
-) -> Tensor:
-    """Applies a causal mask to the energy tensor."""
-    i, j = energy.shape[-2:]
-    r = torch.arange(i, device=device)
-    mask = rearrange(r, "i -> () () i ()") < rearrange(r, "j -> () () () j")
-    mask = F.pad(mask, (j - i, 0), value=False)
-    energy.masked_fill_(mask, mask_value)
-    return energy