Remove PiecewiseAffine augmentation transform

Closes #125 (closed)

docs/usage/train/parameters.md

@@ -97,17 +97,7 @@ transforms = SomeOf(
         GaussianBlur(sigma_limit=2.5),
         GaussNoise(var_limit=50**2),
         ColorJitter(contrast=0.2, brightness=0.2, saturation=0.2, hue=0.2),
-        OneOf(
-            [
-                ElasticTransform(
-                    alpha=20.0,
-                    sigma=5.0,
-                    alpha_affine=1.0,
-                    border_mode=0,
-                ),
-                PiecewiseAffine(scale=(0.01, 0.04), nb_rows=1, nb_cols=4),
-            ]
-        ),
+        ElasticTransform(alpha=20.0, sigma=5.0, alpha_affine=1.0, border_mode=0),
         Sharpen(alpha=(0.0, 1.0)),
         ErosionDilation(min_kernel=1, max_kernel=4, iterations=1),
         Affine(shear={"x": (-20, 20), "y": (0, 0)}),