when i use matplotlib in jupyter notebook,it always raise “ matplotlib is currently using a non-GUI backend” error?

Question

import matplotlib.pyplot as pl
%matplot inline
def learning_curves(X_train, y_train, X_test, y_test):
\"\"\" Calculates the performance of several models with varyin         


        

Answer 1

The error "matplotlib is currently using a non-GUI backend” also occurred when I was trying to display a plot using the command fig.show(). I found that in a Jupyter Notebook, the command fig, ax = plt.subplots() and a plot command need to be in the same cell in order for the plot to be rendered.

For example, the following code will successfully show a bar plot in Out[5]:

In [3]:

import matplotlib.pyplot as plt
%matplotlib inline

In [4]:

x = 'A B C D E F G H'.split()
y = range(1, 9)

In [5]:

fig, ax = plt.subplots()
ax.bar(x, y)

Out[5]: (Container object of 8 artists)

A successful bar plot output

On the other hand, the following code will not show the plot,

In [5]:

fig, ax = plt.subplots()

Out[5]:

An empty plot with only a frame

In [6]:

ax.bar(x, y)

Out[6]: (Container object of 8 artists)

In Out[6] there is only a statement of "Container object of 8 artists" but no bar plot is shown.