When you are in trouble

Error massage; Failed to create Cairo backend! is shown at run time of Hierarchical Clustering Analysis or Principal Component Analysis.

Try to do either of the following ways.

1. Use a PC in which user name doesn't include double-byte character set.
2. Make a new directry which doesn't include double-byte characters, Environmental variables TMP and TEMP are rewrited as so.

The more detailed procedure of the above mentioned No.2 is as follows.

1. make C:\Tmpdirectry.
2. open Control Panel > Environmental Variables, and find TMP and TEMP in User Environmental Variables, and reprace those by C:\Tmp.

Error happens at plot.new() showing figure margins too large at run time of Principal Component Analysis..

adjust image plotting size or change label letter size.

ImportError: No module named '_pywrap_tensorflow_internal' is shown at run time of Deep Learning.

Your PC can not run Tensorflow. Use a newest PC to run Deep Learning.