ImportError: No module named 'texar.tf'

There is an error when using tx.modules.TransformerEncoder to pass hparams!How to deal with it?

Traceback (most recent call last):
File "/home/twjing/PycharmProjects/infilling/Text_Infilling-master/seq2seq.py", line 34, in
import seq2seq_hyperparams
File "/home/twjing/PycharmProjects/infilling/Text_Infilling-master/seq2seq_hyperparams.py", line 10, in
from texar.tf.modules import default_transformer_poswise_net_hparams
ImportError: No module named 'texar.tf'

Start with the imports in seq2seq.py and seq2seq_hyperparams.py, especially the texar.tf.modules import and the TransformerEncoder hparams usage. Reproduce the ImportError in the reported environment and check the installed Texar package and version. Done means the import works and TransformerEncoder can receive the requested hparams without this error.

Written by the indexing model from the issue text.