Pass port in from cmd. If not passed, default to 5000 (it's the Flask default)

[Olivia-liu]

Tested both cases work:

Specify a port

(torchchat-april-18) (torchchat) olivialpx@olivialpx-mbp torchchat % python torchchat.py browser --device cpu --checkpoint-path ${MODEL_PATH} --temperature 0 --num-samples 10 --port 5001
 * Serving Flask app 'chat_in_browser:create_app("--device", "cpu", "--checkpoint-path", "checkpoints/stories15M/stories15M.pt", "--temperature", "0", "--num-samples", "10", "--chat")'
 * Debug mode: off
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
 * Running on http://127.0.0.1:5001

Use default port

(torchchat-april-18) (torchchat) olivialpx@olivialpx-mbp torchchat % python torchchat.py browser --device cpu --checkpoint-path ${MODEL_PATH} --temperature 0 --num-samples 10
 * Serving Flask app 'chat_in_browser:create_app("--device", "cpu", "--checkpoint-path", "checkpoints/stories15M/stories15M.pt", "--temperature", "0", "--num-samples", "10", "--chat")'
 * Debug mode: off
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
 * Running on http://127.0.0.1:5000

[mikekgfb]

Thank you!