Failed to create png image on non graphic node

#1

Hello,
Plot image (.png) creation failed on Linux machine which is a non graphic node, is it expected? what are the Linux system requirements? sample code is as follows

fname='test_file'
import matplotlib.pyplot as plt
fig, ax = plt.subplots( nrows=1, ncols=1 )
ax.plot([10,11,12], [101,19,12])	
fname_img=fname+'.png'
fig.savefig(fname_img)
plt.close(fig)

Thanks,
Srinivas

#2

No that is not expected. Can you be more clear by what you mean “creation failed”?

#3

I mean, “test_file.png” file is not created on disk. But when I executed the same script on graphic node, it created the “test_file.png” file on disk. Issue noticed when executed on NON graphic node.

#4

Ok but there must be an error emitted.

#5

Perhaps just put

import matplotlib
matplotlib.use('agg')

at the top of your script.