我正在尝试将一些CIFAR10图像数据处理为图像块,以便在黑色画布上使用PIL进行打印。在从一个经过训练的模型中提取特征时,我成功地做到了这一点,但在使用Image.fromarray时,我一直得到IndexError: Tuple Index out of range
我的特征被塑造成形状(10000372)的测试数据。数据为32x32x3图像。 我加载cifar10数据,然后将数据展平,但仍会出现此错误
这是我的密码。其中一些是从https://medium.com/@pslinge144/representation-learning-cifar-10-23b0d9833c40借来的
import numpy as np
from sklearn.manifold import TSNE
from time import time
from pathlib import Path
from PIL import Image
from time import time
from keras.datasets import cifar10
# Load the raw CIFAR-10 data
_, (X_test, y_test) = cifar10.load_data()
# normalize the xtest data
X_test = X_test.astype('float32')
X_test /= 255.0
features = X_test # this is (10000, 32, 32, 3) numpy array
features = np.reshape(features, (10000, 3072)) # flatten to 2d array
print(features.shape)
perplexities = [5, 30, 50, 100]
for perplexity in perplexities:
print("Starting t-SNE on images now!")
tsne = TSNE(n_components = 2, init = 'random', random_state = 0, perplexity = perplexity, learning_rate = 200).fit_transform(features)
tx, ty = tsne[:,0], tsne[:,1] # grab tsne first and 2nd dimensions
# min max normalize for plotting
tx = (tx-np.min(tx)) / (np.max(tx) - np.min(tx))
ty = (ty-np.min(ty)) / (np.max(ty) - np.min(ty))
width = 4000
height = 3000
max_dim = 100
full_image = Image.new('RGB', (width, height))
for idx, x in enumerate(features):
tile = Image.fromarray(np.uint8(x * 255), 'RGB') # rescale pixel values to [0,255] scale
rs = max(1, tile.width / max_dim, tile.height / max_dim)
tile = tile.resize((int(tile.width / rs),int(tile.height / rs)),Image.ANTIALIAS)
full_image.paste(tile, (int((width-max_dim) * tx[idx]),int((height-max_dim) * ty[idx])))
plots_output_path = Path('../data/processed/tSNE_plots').resolve()
filename = "tsne_perplex%d_plot.png" % (perplexity)
fullpath = plots_output_path.joinpath(filename).resolve()
full_image.save(str(fullpath))
以下是错误:
Traceback (most recent call last):
File "tSNE_image_thumbnail.py", line 80, in <module>
tSNE_image(x_test, 1000, 200, plots_output_path, 2)
File "tSNE_image_thumbnail.py", line 56, in tSNE_image
tile = Image.fromarray(np.uint8(x * 255), 'RGB')
File "/home/zw/src/image_classification_ML/venv/lib/python3.8/site-packages/PIL/Image.py", line 2728, in fromarray
size = shape[1], shape[0]
IndexError: tuple index out of range
同样,当从CNN模型中提取特征并将其用于形状(10000512)密集层时,此代码工作正常。不知道为什么这会给我带来麻烦。有什么想法吗?提前谢谢
您的产品线中提供了长度为“3072”的阵列
只需对x调用
np.uint8(x * 255).shape
进行验证,该x返回(3072,)
但对于“RGB”图像,您需要3维,而不仅仅是1维
因此,您会得到错误
tuple index out of range
,因为需要一个包含三个条目而不是一个条目的数组这意味着需要一个包含三个条目的元组,而不是(3072),例如(8,96,4),它将3072个值的一维数组映射到
8 x 96 x 4
(=3072)个值的矩阵因此,您可以将代码中的行更改为
但最后,您应该根据图像尺寸定义形状
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