InvalidArgumentError: 矩阵大小不兼容: In[0]: [32,21], In[1]: [128,1]

Question

以下是我的代码可以请帮助我

import tensorflow as tf
from keras.preprocessing.image import ImageDataGenerator
import numpy as np

train_datagen = ImageDataGenerator(
        rescale=1./255,
        shear_range=0.2,
        zoom_range=0.2,
        horizontal_flip=True)

training_set = train_datagen.flow_from_directory(
        'gopi_cnn_training_data',
        target_size=(100, 100),
        batch_size=32)
    

test_datagen = ImageDataGenerator(rescale=1./255)
test_set = test_datagen.flow_from_directory(
        'gopi_cnn_test_data',
        target_size=(100,100),
        batch_size=32)


cnn = tf.keras.models.Sequential()


cnn.add(tf.keras.layers.Conv2D(filters=32, kernel_size=3, activation='relu', input_shape=[100,100,3]))


cnn.add(tf.keras.layers.MaxPool2D(pool_size=2, strides=2))

cnn.add(tf.keras.layers.Conv2D(filters=32, kernel_size=3, activation='relu'))
cnn.add(tf.keras.layers.MaxPool2D(pool_size=2, strides=2))


cnn.add(tf.keras.layers.Flatten())

cnn.add(tf.keras.layers.Dense(units=128, activation='relu'))


cnn.add(tf.keras.layers.Dense(units=1, activation='softmax'))
 
cnn.compile(optimizer='adam', loss = 'categorical_crossentropy', metrics = ['accuracy'])

cnn.fit(x = training_set, validation_data = test_set, epochs = 25) 

我收到以下错误 InvalidArgumentError: Matrix size-incompatible: In[0]: [32,21], In[1]: [128,1] [[node MatMul (defined at C:\\Users\\THUMMAGO\\AppData\\ Local\\Continuum\\anaconda3\\lib\\site-packages\\tensorflow_core\\python\\framework\\ops.py:1751)]] [Op:__inference_distributed_function_5318]

函数调用栈：distributed_function

Answer 1

我使用二进制类数据集复制了这个问题。

对于解决方案，您可能需要在代码中提供正确的激活函数和损失函数，如下所示：

cnn.add(tf.keras.layers.Dense(units=1, activation='sigmoid')) #for binary classes
cnn.compile(optimizer='adam', loss = 'binary_crossentropy', metrics = ['accuracy'])

或者在模型的最后一层定义units=no_of_classes ，并选择合适的激活函数和损失函数来实现代码。