[environment] cudatoolkit cudnn and python3.6

[Zachary4biz]

I have found something might be useful while preparing the environment (conda)

my environment: gcc4.8.5 centos7.5.1804

change python=3.7.3 to python=3.6.8 in environment_linux_gpu.yml and remove all =py37...

• with python3.7, there might be an error of glibc as libm.so.6: version GLIBC_2.23' not found` if working on some ancient machine.

conda install cudatoolkit=10.0 & conda install cudnn=7.6.0

• get libcublas.so.10.0 not found when import tensorflow

edit line7 of keras_contrib/utils/test_utils.py if come across syntax error of this line.

• mostly some error of spacing

[mnicnc404]

Compatibility between tensorflow and cuda / cudnn has always been an issue (On the other hand, pytorch has done a relatively nice job). We have to apologize for not providing cuda / cudnn installing instructions. We've also noticed that there are some compatibility issues of ancient nvidia gpus, drivers and cuda. Currently we don't have time to handle gpu / cuda / cudnn compatibility issues since we contribute to this repo in our spare time.

Thank you again for your information.