我是Python初学者 我使用Keras和Tensorflow创建ML模型。当我有4个类时,它工作得很好,但是添加了更多的类,它得到了这个错误。我们已经增加了10门课。 我使用python 3.7、Keras 2.3.1和Tensorflow 1.14。 我在这个链接中遵循教程 here。 我已经浪费了三天时间来解决这个问题,但我不能 谢谢
Classification.py文件
import os as os
from keras.models import load_model
from keras.utils import np_utils
import model as md
import preparation as prep
import visualization as vis
from keras.utils import to_categorical
from keras import metrics
# ----------- dataset settings -----------
# number of instances per class used for train and test in total:
# should be smaller or equal than generated subset
INSTANCES_PER_CLASS = 5000
NUM_CLASS_LIMIT = 345 # limit of classes
# path of the dataset seperated in train and test
DATA_PATH = os.path.join(os.getcwd(), "../Draw/dataset/train_test_20k/")
# path for all created files
MODEL_PATH = os.path.join(os.getcwd(), "models/" + str(NUM_CLASS_LIMIT) + "/" + str(INSTANCES_PER_CLASS) + "/")
# ----------- model settings -----------
MODEL_NAME = 'model.h5' # name for the freezed model
# input size
IMG_WIDTH = 28
IMG_HEIGHT = 28
IMG_SIZE = IMG_WIDTH * IMG_HEIGHT
IMG_DIM = 1
# training settings
EPOCHS = 10
BATCH_SIZE = 256
if __name__ == "__main__":
# create new directories if required
if not os.path.isdir(MODEL_PATH):
os.makedirs(MODEL_PATH)
# get the dataset
num_classes, x_train, x_test, y_train, y_test, classes_dict = prep.collect_data(NUM_CLASS_LIMIT)
print("trainingsset instances {}".format(x_train.shape))
print("trainingsset labels {}".format(y_train.shape))
# plot first test images
#vis.plot_first_n_images(x_test, y_test, classes_dict, 100)
# class representation as "binary" vector
y_train = np_utils.to_categorical(y_train, num_classes=num_classes)
y_test = np_utils.to_categorical(y_test, num_classes=num_classes)
# create or load keras model
if not os.path.isfile(MODEL_PATH + MODEL_NAME):
print("create model...")
model = md.build_model(input_shape=x_train.shape[1:], num_classes=num_classes)
else:
print("load existing model...")
model = load_model(MODEL_PATH + MODEL_NAME)
# score trained model using validation set
scores = model.evaluate(x_test, y_test, verbose=1)
print('test loss:', scores[0])
print('test accuracy:', scores[1])
model.compile(loss='categorical_crossentropy',
optimizer='adam',
metrics=['acc'])
# print model information if desired
print(model.summary())
# model training from scratch or retrain by existing model
hist = model.fit(x_train, y_train, batch_size=BATCH_SIZE,
epochs=EPOCHS,
validation_data=[x_test, y_test],
shuffle=True)
#from keras.utils import plot_model
#plot_model(model, to_file=MODEL_PATH + 'model.png')
# evaluation process
print("evaluate model...")
# summarize history during training phase
# plot training and validation set accuracy
vis.plot_training_history_accuracy(hist)
# test set evaluation
scores = model.evaluate(x_test, y_test, verbose=1)
print(scores)
print('test loss:', scores[0])
print('test accuracy:', scores[1])
# create and plot confusion matrix
#y_pred = model.predict(x_test)
#vis.plot_confusion_matrix(y_pred, y_test, classes=list(classes_dict.values()))
# freeze the model (architecture and weights)
model.save(os.path.join(MODEL_PATH, MODEL_NAME))
print('saved trained model at {}'.format(os.path.join(MODEL_PATH, MODEL_NAME)))
模型代码Model.py
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from keras.models import Model
from keras.layers import Input, Dense, Dropout, Flatten
from keras.layers import Conv2D, MaxPooling2D
def build_model(input_shape, num_classes):
"""
Builds the model architecture based on MNIST CNN
https://www.tensorflow.org/tutorials/estimators/cnn
Args:
input_spape: Input shape of the model
num_classes: Number of classes
Returns:
keras.models.Model: The created model
"""
inputs = Input(shape=input_shape)
x = Conv2D(32, (5,5), activation='relu')(inputs)
x = MaxPooling2D(pool_size=(2, 2))(x)
x = Conv2D(128, (3, 3), activation='relu')(x)
x = MaxPooling2D(pool_size=(2, 2))(x)
x = Dropout(0.2)(x)
x = Flatten()(x)
x = Dense(512, activation='relu')(x)
x = Dense(256, activation='relu')(x)
predictions = Dense(num_classes, activation='softmax')(x)
print("SHOW DESEN", num_classes)
return Model(inputs=inputs, outputs=predictions)
我认为错误来自这一步:
对“target”的引用表示“y_train”数组。您可能希望通过在拟合之前检查y_train.shape来确认尝试拟合的y_列与实际model.summary()匹配。这可能是因为设计用于4个等级的旧型号正在使用,即使新的10级y_列车正在传递给model.fit()
诊断代码示例(已注释掉model.fit):
我希望这有帮助
相关问题 更多 >
编程相关推荐