WIP

keras_fsl/losses/yolo_loss.py

@@ -3,7 +3,6 @@
 
 def yolo_loss(anchors, threshold):
     """
-
     Args:
         anchors (pandas.DataFrame): dataframe of the anchors with width and height columns.
         threshold:
@@ -14,9 +13,19 @@ def yolo_loss(anchors, threshold):
     def _yolo_loss(y_true, y_pred):
         """
         y_true and y_pred are (batch_size, number of boxes, 4 (+ 1) + number of classes (+ anchor_id for y_pred)).
-        The number of boxes is determined by the network architecture as in single-shot detection one can only predict
+        The number of boxes is determined by the network architecture: as in single-shot detection one can only predict
         grid_width x grid_height boxes per anchor.
+        In all Yolo implementation, it is assumed that the input shape is squared. For simplicity we do the same here
+        @TODO: rewrite loss without assuming a squared input_shape
         """
+        batch_size = tf.shape(y_pred)
+        anchor_feature_maps = [tf.reshape(y_pred[y_pred[..., -1] == i], (batch_size, -1, tf.shape(y_pred)[-1])) for i in anchors.index]
+        anchor_feature_maps = [tf.reshape(map, (batch_size, tf.math.sqrt(tf.shape(map)[1]), -1, )) for map in anchor_feature_maps]
+        y_pred = [
+            tf.
+        ]
+        y_true = tf.reshape()
+
         loss_coordinates = tf.Variable(0.0)
         loss_box = tf.Variable(0.0)
         loss_objectness = tf.Variable(0.0)