Add refactor of iam lines

1 files changed, 6 insertions, 154 deletions

diff --git a/text_recognizer/data/transforms.py b/text_recognizer/data/transforms.py
index b6a48f5..2291eec 100644
--- a/text_recognizer/data/transforms.py
+++ b/text_recognizer/data/transforms.py
@@ -1,148 +1,15 @@
 """Transforms for PyTorch datasets."""
 from abc import abstractmethod
 from pathlib import Path
-import random
 from typing import Any, Optional, Union
 
 from loguru import logger
-import numpy as np
-from PIL import Image
 import torch
 from torch import Tensor
-import torch.nn.functional as F
-from torchvision import transforms
-from torchvision.transforms import (
-    ColorJitter,
-    Compose,
-    Normalize,
-    RandomAffine,
-    RandomHorizontalFlip,
-    RandomRotation,
-    ToPILImage,
-    ToTensor,
-)
 
 from text_recognizer.datasets.iam_preprocessor import Preprocessor
-from text_recognizer.datasets.util import EmnistMapper
-
-
-class RandomResizeCrop:
-    """Image transform with random resize and crop applied.
-
-    Stolen from
-
-    https://github.com/facebookresearch/gtn_applications/blob/master/datasets/iamdb.py
-
-    """
-
-    def __init__(self, jitter: int = 10, ratio: float = 0.5) -> None:
-        self.jitter = jitter
-        self.ratio = ratio
-
-    def __call__(self, img: np.ndarray) -> np.ndarray:
-        """Applies random crop and rotation to an image."""
-        w, h = img.size
-
-        # pad with white:
-        img = transforms.functional.pad(img, self.jitter, fill=255)
-
-        # crop at random (x, y):
-        x = self.jitter + random.randint(-self.jitter, self.jitter)
-        y = self.jitter + random.randint(-self.jitter, self.jitter)
-
-        # randomize aspect ratio:
-        size_w = w * random.uniform(1 - self.ratio, 1 + self.ratio)
-        size = (h, int(size_w))
-        img = transforms.functional.resized_crop(img, y, x, h, w, size)
-        return img
-
-
-class Transpose:
-    """Transposes the EMNIST image to the correct orientation."""
-
-    def __call__(self, image: Image) -> np.ndarray:
-        """Swaps axis."""
-        return np.array(image).swapaxes(0, 1)
-
-
-class Resize:
-    """Resizes a tensor to a specified width."""
-
-    def __init__(self, width: int = 952) -> None:
-        # The default is 952 because of the IAM dataset.
-        self.width = width
-
-    def __call__(self, image: Tensor) -> Tensor:
-        """Resize tensor in the last dimension."""
-        return F.interpolate(image, size=self.width, mode="nearest")
-
-
-class AddTokens:
-    """Adds start of sequence and end of sequence tokens to target tensor."""
-
-    def __init__(self, pad_token: str, eos_token: str, init_token: str = None) -> None:
-        self.init_token = init_token
-        self.pad_token = pad_token
-        self.eos_token = eos_token
-        if self.init_token is not None:
-            self.emnist_mapper = EmnistMapper(
-                init_token=self.init_token,
-                pad_token=self.pad_token,
-                eos_token=self.eos_token,
-            )
-        else:
-            self.emnist_mapper = EmnistMapper(
-                pad_token=self.pad_token, eos_token=self.eos_token,
-            )
-        self.pad_value = self.emnist_mapper(self.pad_token)
-        self.eos_value = self.emnist_mapper(self.eos_token)
-
-    def __call__(self, target: Tensor) -> Tensor:
-        """Adds a sos token to the begining and a eos token to the end of a target sequence."""
-        dtype, device = target.dtype, target.device
-
-        # Find the where padding starts.
-        pad_index = torch.nonzero(target == self.pad_value, as_tuple=False)[0].item()
-
-        target[pad_index] = self.eos_value
-
-        if self.init_token is not None:
-            self.sos_value = self.emnist_mapper(self.init_token)
-            sos = torch.tensor([self.sos_value], dtype=dtype, device=device)
-            target = torch.cat([sos, target], dim=0)
-
-        return target
-
-
-class ApplyContrast:
-    """Sets everything below a threshold to zero, i.e. increase contrast."""
-
-    def __init__(self, low: float = 0.0, high: float = 0.25) -> None:
-        self.low = low
-        self.high = high
-
-    def __call__(self, x: Tensor) -> Tensor:
-        """Apply mask binary mask to input tensor."""
-        mask = x > np.random.RandomState().uniform(low=self.low, high=self.high)
-        return x * mask
-
-
-class Unsqueeze:
-    """Add a dimension to the tensor."""
-
-    def __call__(self, x: Tensor) -> Tensor:
-        """Adds dim."""
-        return x.unsqueeze(0)
-
-
-class Squeeze:
-    """Removes the first dimension of a tensor."""
-
-    def __call__(self, x: Tensor) -> Tensor:
-        """Removes first dim."""
-        return x.squeeze(0)
-
-
+from text_recognizer.data.emnist import emnist_mapping
+       
 class ToLower:
     """Converts target to lower case."""
 
@@ -155,29 +22,14 @@ class ToLower:
 class ToCharcters:
     """Converts integers to characters."""
 
-    def __init__(
-        self, pad_token: str, eos_token: str, init_token: str = None, lower: bool = True
-    ) -> None:
-        self.init_token = init_token
-        self.pad_token = pad_token
-        self.eos_token = eos_token
-        if self.init_token is not None:
-            self.emnist_mapper = EmnistMapper(
-                init_token=self.init_token,
-                pad_token=self.pad_token,
-                eos_token=self.eos_token,
-                lower=lower,
-            )
-        else:
-            self.emnist_mapper = EmnistMapper(
-                pad_token=self.pad_token, eos_token=self.eos_token, lower=lower
-            )
+    def __init__(self) -> None:
+        self.mapping, _, _ = emnist_mapping() 
 
     def __call__(self, y: Tensor) -> str:
         """Converts a Tensor to a str."""
         return (
-            "".join([self.emnist_mapper(int(i)) for i in y])
-            .strip("_")
+            "".join([self.mapping(int(i)) for i in y])
+            .strip("<p>")
             .replace(" ", "▁")
         )