Notes on installing Merlion

• reference: github
• according to the github page,using pip install salesforce-merlion should be sufficient to have the Merlion package installed.
• however, on Windows machine, an error can occur due to Merlion's dependency package fbprophet.
• in order to have merlion package be installed successfully, we need to first install fbprophet package. This stack overflow page provides useful tricks to fix issues with installing fbprophet package on Windows machine.
• what did not work for me: first run pip install pystan==2.18.0.0, then run pip install fbprophet.
• what worked for me:
  • first run pip install pystan==2.17.1.0. This step will uninstall whatever version of pystan package on the machine and isntall the version specified in the pip command.
  • then run pip install fbprophet. This step will retrieve the latest pystan version, uninstall the version installed from previous step and install the latest version. The successfuly installation message Successfully installed cmdstanpy-0.9.68 prophet-1.0.1 pystan-2.19.1.1.