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"""Transformer decoder module."""
from copy import deepcopy
from typing import Optional
from torch import Tensor, nn
from text_recognizer.networks.transformer.decoder_block import DecoderBlock
from text_recognizer.networks.transformer.embeddings.rotary import RotaryEmbedding
class Decoder(nn.Module):
"""Decoder Network."""
def __init__(
self,
depth: int,
dim: int,
block: DecoderBlock,
rotary_embedding: RotaryEmbedding,
) -> None:
super().__init__()
self.depth = depth
self.rotary_embedding = rotary_embedding
self.blocks = nn.ModuleList([deepcopy(block) for _ in range(self.depth)])
self.ln = nn.LayerNorm(dim)
def forward(
self,
x: Tensor,
context: Optional[Tensor] = None,
mask: Optional[Tensor] = None,
) -> Tensor:
"""Applies the network to the signals."""
for block in self.blocks:
x = block(
x=x,
context=context,
mask=mask,
rotary_embedding=self.rotary_embedding,
)
return self.ln(x)
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