Create image_rot90

Author: celisun

image_processing/image_rot90

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+
+def image_rot90(images):
+    """
+    One technique of data augmentation
+    rotate all images by 90 degree
+    """
+    images = tf.reshape(images, [-1, 32, 32, 3])
+    distorted_image = tf.map_fn(lambda img: tf.image.rot90(img), images)
+    distorted_image = tf.reshape(distorted_image, [-1, 32*32*3])
+    return distorted_image
+