AttributeError: 'AxesSubplot' object has no attribute 'xlabel'

Question

l have to plot to save after a for loop where l get all the values . Here is my code . However l get an error at the line: fig1, ax1 = plt.subplots():

g_i= []
g_train_loss= []
g_valid_loss=[]
g_train_accuracy=[]
g_valid_accuracy=[]
for epoch in range(niter):
        #other computations
        g_i = np.append(g_i, epoch)
        g_train_loss = np.append(g_train_loss, loss_avg.val())
        g_train_accuracy = np.append(g_train_accuracy,accuracy_train)
        g_valid_loss = np.append(g_valid_loss, cost_val)
        g_valid_accuracy = np.append(g_valid_accuracy, accuracy_valid)
fig1, ax1 = plt.subplots()
fig2, ax2 = plt.subplots()
ax1.plot(g_i,g_train_loss,label='train_loss')
ax1.plot(g_i,g_valid_loss,label='valid_loss')
ax1.xlabel("epoch")
ax1.ylabel("loss")
f1=ax1.figure()
f1.savefig('loss.png', bbox_inches='tight')
ax2.plot(g_i,g_train_accuracy,label='train_acc')
ax2.plot(g_i,g_train_accuracy,label='valid_acc')
ax2.xlabel("epoch")
ax2.ylabel("accuracy")
f2=ax2.figure()
f2.savefig('acc.png', bbox_inches='tight')

l get the following error at

fig1, ax1 = plt.subplots()

which is :

/python2.7/site-packages/matplotlib/backends/backend_qt5.py", line 144, in _create_qApp
    raise RuntimeError('Invalid DISPLAY variable')
RuntimeError: Invalid DISPLAY variable

Edit1 : l'm usisng ubuntu 16.04 aws amazon server l did the following :

import matplotlib
matplotlib.use('agg')
import matplotlib.pyplot as plt

then l get the following new error : ax1.xlabel("epoch") AttributeError: 'AxesSubplot' object has no attribute 'xlabel'

You need to tell us what your OS is, how you installed matplotlib, if you have an X server running (assuming you're on a real Ubuntu machine), if you run in a docker environment, and generally read the guidelines on how to ask questions on this site. https://stackoverflow.com/help/how-to-ask — BoboDarph, Aug 22 '17 at 16:14
Sorry, @BoboDarph, please see my edit. l run it on aws server — helene, Aug 22 '17 at 16:31
Can you try: plt.switch_backend('agg') instead of matplotlib.use('agg'). Sauce: https://github.com/matplotlib/matplotlib/issues/3466 — BoboDarph, Aug 22 '17 at 16:35
import matplotlib import matplotlib.pyplot as plt plt.switch_backend('agg') @BoboDarph is this what you mean ? — helene, Aug 22 '17 at 16:39
Try to read through the whole link I posted, the situation described seems to be very similar to yours. Also note that if no display or virtual display is attached to that machine, your plot will most likely fail with the error you described. — BoboDarph, Aug 22 '17 at 16:42
@BoboDarph, you talk about this error ax1.xlabel("epoch") AttributeError: 'AxesSubplot' object has no attribute 'xlabel' ? — helene, Aug 22 '17 at 16:43
There are two ways to set the xlabel: `ax.set_xlabel("epoch")`, or `plt.xlabel("epoch")`, but not `ax.xlabel("epoch")`. — tmdavison, Aug 22 '17 at 16:44
@helene. You get a similar message sometimes if you try to run graphical applications as root on the newer X servers. — Mad Physicist, Aug 22 '17 at 16:53
@BoboDarph, the original problem l solved it as l did in my edit — helene, Aug 22 '17 at 17:35

AttributeError: 'AxesSubplot' object has no attribute 'xlabel'

0 Answers0