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"""PyTorch Lightning model for base Transformers."""
from typing import Tuple
import attr
from torch import Tensor
from text_recognizer.models.base import BaseLitModel
@attr.s(auto_attribs=True, eq=False)
class VQVAELitModel(BaseLitModel):
"""A PyTorch Lightning model for transformer networks."""
latent_loss_weight: float = attr.ib(default=0.25)
def forward(self, data: Tensor) -> Tensor:
"""Forward pass with the transformer network."""
return self.network(data)
def training_step(self, batch: Tuple[Tensor, Tensor], batch_idx: int) -> Tensor:
"""Training step."""
data, _ = batch
reconstructions, vq_loss = self(data)
loss = self.loss_fn(reconstructions, data)
loss = loss + self.latent_loss_weight * vq_loss
self.log("train/loss", loss)
return loss
def validation_step(self, batch: Tuple[Tensor, Tensor], batch_idx: int) -> None:
"""Validation step."""
data, _ = batch
reconstructions, vq_loss = self(data)
loss = self.loss_fn(reconstructions, data)
loss = loss + self.latent_loss_weight * vq_loss
self.log("val/loss", loss, prog_bar=True)
def test_step(self, batch: Tuple[Tensor, Tensor], batch_idx: int) -> None:
"""Test step."""
data, _ = batch
reconstructions, vq_loss = self(data)
loss = self.loss_fn(reconstructions, data)
loss = loss + self.latent_loss_weight * vq_loss
self.log("test/loss", loss)
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