fix style image scale (#445)

magenta/models/image_stylization/image_stylization_create_dataset.py

@@ -81,7 +81,7 @@ def main(unused_argv):
 
       with tf.Graph().as_default():
         style_end_points = learning.precompute_gram_matrices(
-            tf.expand_dims(tf.to_float(style_image) / 255.0, 0),
+            tf.expand_dims(tf.to_float(style_image), 0),
             # We use 'pool5' instead of 'fc8' because a) fully-connected layers
             # are already too deep in the network to be useful for style and b)
             # they're quite expensive to store.