UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figur

当出现报错时：

除了网上说的：
将

matplotlib.use('Agg')

更换为

matplotlib.use('TkAgg')

之外
如果发现这样改后还是无效，则是因为你没有把下面的程序语句放在所有包的最后面

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

修改后：

from captioning.data.dataloaderraw import *
import cv2
import argparse
from captioning.utils.resnet_utils import myResnet
from captioning.utils import resnet
import captioning.utils.opts as opts
import torch

import numpy as np
from visualize import visualize_grid_attention_v2

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

这样就不会警告，而且能显示图像了