ModuleNotFoundError: No module named 'texar'

hi,
when I try to run the prepare_data.py in the directory of text_style_transfer, I met the following error. can you help me?

Traceback (most recent call last):
File "prepare_data.py", line 16, in
import texar.tf as tx
ModuleNotFoundError: No module named 'texar'

Start with text_style_transfer/prepare_data.py and inspect the import at line 16, then check the repository's documented setup instructions for the required Texar dependency. The work is done when prepare_data.py starts without the reported ModuleNotFoundError.

Written by the indexing model from the issue text.