Update app.py

app.py

@@ -134,7 +134,7 @@ class InferenceModel(object):
         self.restore_from_checkpoint(checkpoint_path)
 
     @property
-	def input_shapes(self):
+    def input_shapes(self):
 		return {
 			'encoder_input_tokens': (self.batch_size, self.inputs_length),
 			'decoder_input_tokens': (self.batch_size, self.outputs_length)