使用keras + tf训练神经网络时出现错误，没有报错直接退出程序
import keras
from keras.optimizers import adam_v2
from keras.models import Sequential
from keras.layers import Dense
from keras.layers import Convolution2D
from keras.layers import Flatten
from keras.layers import MaxPooling2D
from keras.preprocessing.image import ImageDataGenerator
from keras.models import Sequential
from keras.layers import Conv2D
from keras.layers import MaxPooling2D
from keras.layers import Flatten
from keras.layers import Dense
from keras.layers import Input, Conv2D, Dense, concatenate,MaxPooling2D,Dropout
from keras.models import Model
from tensorflow.keras.callbacks import ModelCheckpoint, EarlyStopping
from collections import Counter
from keras.callbacks import EarlyStopping
import tensorflow as tf
train_loc ='D:/Lung_sound_classification-main/Feature_extraction/picture_for_cnn/train/'
validation_loc = 'D:/Lung_sound_classification-main/Feature_extraction/picture_for_cnn/validation/'
trdata = ImageDataGenerator(rescale=1 / 255.0)
traindata = trdata.flow_from_directory(directory=train_loc, target_size=(224,224),batch_size=5,shuffle=False)
valdata = ImageDataGenerator(rescale=1 / 255.0)
validationdata = valdata.flow_from_directory(directory=validation_loc, target_size=(224,224),batch_size=5,shuffle=False)
img_inputs = Input(shape=(224,224, 3))
classifier=Conv2D(64, (5, 5), activation = 'relu')(img_inputs)
classifier=MaxPooling2D(pool_size = (2, 2))(classifier)
classifier=Conv2D(64, (3, 3), activation = 'relu')(classifier)
classifier=MaxPooling2D(pool_size = (2, 2))(classifier)
classifier=Conv2D(96, (3, 3), activation = 'relu')(classifier)
classifier=MaxPooling2D(pool_size = (2, 2))(classifier)
classifier=Conv2D(96, (3, 3), activation = 'relu')(classifier)
classifier=MaxPooling2D(pool_size = (2, 2))(classifier)
classifier=Flatten()(classifier)
classifier=Dense(units = 256, activation = 'relu')(classifier)
classifier=Dropout(0.6)(classifier)
classifier=Dense(units = 128, activation = 'relu')(classifier)
classifier=Dropout(0.3)(classifier)
classifier=Dense(units = 64, activation = 'relu')(classifier)
classifier=Dropout(0.15)(classifier)
classifier=Dense(units = 32, activation = 'relu')(classifier)
classifier=Dropout(0.075)(classifier)
classifier=Dense(units = 16, activation = 'relu')(classifier)
classifier=Dropout(0.0325)(classifier)
classifier=Dense(units = 8, activation = 'relu')(classifier)
outputs=Dense(units = 5, activation = 'softmax')(classifier)
model = Model(inputs=img_inputs, outputs=outputs, name="LS_model")
opt = adam_v2.Adam(learning_rate=0.00001)
print(opt)
model.compile(optimizer = opt, loss = 'categorical_crossentropy', metrics = ['accuracy'])
STEP_SIZE_TRAIN=traindata.n//traindata.batch_size
STEP_SIZE_VALID=validationdata.n//validationdata.batch_size
checkpoint = ModelCheckpoint("working/best_model.h5", monitor='val_accuracy', verbose=1,
save_best_only=True, save_weights_only=False, mode='auto')
early = EarlyStopping(monitor='val_accuracy', min_delta=0, patience=20, verbose=1, mode='auto')
model.summary()
histore = model.fit(traindata,epochs=600,steps_per_epoch=STEP_SIZE_TRAIN,validation_data=validationdata,validation_steps=STEP_SIZE_VALID,callbacks=[checkpoint,early])
