Do not normalize tensor for attention map visualization

Closes #141 (closed)

dan/predict/prediction.py

@@ -87,7 +87,7 @@ class DAN:
         """
         image = read_image(path)
         preprocessed_image = self.preprocessing_transforms(image)
-        return self.normalization(preprocessed_image)
+        return preprocessed_image, self.normalization(preprocessed_image)
 
     def predict(
         self,
@@ -264,16 +264,18 @@ def process_batch(
     threshold_method,
     threshold_value,
 ):
-    input_images, input_sizes = [], []
+    input_images, visu_images, input_sizes = [], [], []
     logger.info("Loading images...")
     for image_path in image_batch:
         # Load image and pre-process it
-        image = dan_model.preprocess(str(image_path))
-        input_images.append(image)
-        input_sizes.append(image.shape[1:])
+        visu_image, input_image = dan_model.preprocess(str(image_path))
+        input_images.append(input_image)
+        visu_images.append(visu_image)
+        input_sizes.append(input_image.shape[1:])
 
     # Convert to tensor of size (batch_size, channel, height, width) with batch_size=1
     input_tensor = pad_images(input_images).to(device)
+    visu_tensor = pad_images(visu_images).to(device)
 
     logger.info("Images preprocessed!")
 
@@ -350,7 +352,7 @@ def process_batch(
             logger.info(f"Creating attention GIF in {gif_filename}")
             # this returns polygons but unused for now.
             plot_attention(
-                image=input_tensor[idx],
+                image=visu_tensor[idx],
                 text=predicted_text,
                 weights=attentions,
                 level=attention_map_level,