Fix augmix variable name scope overlap, default non-blended mode

timm/data/auto_augment.py

@@ -691,7 +691,7 @@ class AugMixAugment:
         self.alpha = alpha
         self.width = width
         self.depth = depth
-        self.blended = True
+        self.blended = False
 
     def _calc_blended_weights(self, ws, m):
         ws = ws * m
@@ -703,13 +703,13 @@ class AugMixAugment:
             rws.append(alpha)
         return np.array(rws[::-1], dtype=np.float32)
 
-    def _apply_blended(self, img, ws, m):
+    def _apply_blended(self, img, mixing_weights, m):
         # This is my first crack and implementing a slightly faster mixed augmentation. Instead
         # of accumulating the mix for each chain in a Numpy array and then blending with original,
         # it recomputes the blending coefficients and applies one PIL image blend per chain.
         # TODO I've verified the results are in the right ballpark but they differ by more than rounding.
         img_orig = img.copy()
-        ws = self._calc_blended_weights(ws, m)
+        ws = self._calc_blended_weights(mixing_weights, m)
         for w in ws:
             depth = self.depth if self.depth > 0 else np.random.randint(1, 4)
             ops = np.random.choice(self.ops, depth, replace=True)
@@ -719,21 +719,19 @@ class AugMixAugment:
             img = Image.blend(img, img_aug, w)
         return img
 
-    def _apply_basic(self, img, ws, m):
+    def _apply_basic(self, img, mixing_weights, m):
         # This is a literal adaptation of the paper/official implementation without normalizations and
         # PIL <-> Numpy conversions between every op. It is still quite CPU compute heavy compared to the
         # typical augmentation transforms, could use a GPU / Kornia implementation.
-        w, h = img.size
-        c = len(img.getbands())
-        mixed = np.zeros((w, h, c), dtype=np.float32)
-        for w in ws:
+        img_shape = img.size[0], img.size[1], len(img.getbands())
+        mixed = np.zeros(img_shape, dtype=np.float32)
+        for mw in mixing_weights:
             depth = self.depth if self.depth > 0 else np.random.randint(1, 4)
             ops = np.random.choice(self.ops, depth, replace=True)
             img_aug = img  # no ops are in-place, deep copy not necessary
             for op in ops:
                 img_aug = op(img_aug)
-            img_aug = np.asarray(img_aug, dtype=np.float32)
-            mixed += w * img_aug
+            mixed += mw * np.asarray(img_aug, dtype=np.float32)
         np.clip(mixed, 0, 255., out=mixed)
         mixed = Image.fromarray(mixed.astype(np.uint8))
         return Image.blend(img, mixed, m)