message: Update README.md
  Fix the wrong indentation of the example Python code.
diff: @@ -133,6 +133,7 @@ If you'd like to quickly train a model using the Python interface, follow these
  if __name__ == "__main__":
  json_config_file = sys.argv[1]
  train(json_config_file)
  +
  ```
  **NOTE**: Update the vvgpu (the active GPUs), batchsize, and batchsize_eval parameters according to your GPU system.
  