[1]install termux
[2]enter termux
[3]install proot-distro with to execute command of
'''apt install proot-distro'''
[4]install a distro with using proot-distro 
[5]login the distro
[6]install a kind of conda such as miniconda and enter conda environment
[7]create a conda virtual environment and activate it
[8]install pytorch from binary
'''conda install pytorch torchvision torchaudio cpuonly -c pytorch'''
[9]install pytorch from source
[9.1]enable the option of android located in [setting>> developer options>> disable child process restrictiona]
[9.2]