[A Weird Bug] caused by the name of Python script

I attempt to run a Python LDA module after 'pip install lda'. But there always occurs a weird bug: lda.py line 3 -- "no module named datasets". First, I thought the package of LDA are not installed correctly. So I looked at the code in the lda.py located in
the site-packages and found nothing about the module named datasets. But finally I found a lda.py written by me under my current working directory......