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What is the EXP_PATH in qlib/trade/main.py?

🐛 Bug Description

When I am running the qlib/examples/trade/main.py file to Line 64, which is EXP_PATH = os.environ['EXP_PATH'], it triggers an error saying '*** KeyError: 'EXP_PATH''. And when I call to see os.environ.keys(), it clearly has no key named 'EXP_PATH'. So what is this path? Do I need to do some preparations before running the main code? Thank you very much.

To Reproduce

Steps to reproduce the behavior:

  1. Run the qlib/examples/trade/main.py code to Line 64.

Environment

  • Qlib version: 0.6.1.99
  • Python version: 3.7.4 64-bit
  • OS (Windows, Linux, MacOS): Windows