如何解决与PlaidML相比,张量流精度非常低
我编写了脚本来检查tensorflow.keras和PlaidML
tensorflow 2.3.1
plaidml-keras 0.7.0
plaidml 0.7.0
Python 3.8.5
对于isGPU = True
(PlaidML)
Epoch 1/1
60000/60000 [==============================] - 21s 358us/step - loss: 0.2637 - acc: 0.9186 - val_loss: 0.0590 - val_acc: 0.9817
对于isGPU = False
(张量流)
469/469 [==============================] - 33s 71ms/step - loss: 2.2862 - accuracy: 0.1291 - val_loss: 2.2572 - val_accuracy: 0.3704
有一些区别。
但是,
- 精度是完全不同的。
为什么会发生?
我认为两者的学习方式都与60000个样本,128个batch_size和1个纪元相同。
为什么会有差异?
有人帮忙吗?
isGPU = True ## or False
if isGPU:
os.environ["KERAS_BACKEND"] = "plaidml.keras.backend"
import keras as myKeras
from keras.datasets import mnist
from keras.models import Sequential
from keras.layers import Dense,Dropout,Flatten
from keras.layers import Conv2D,MaxPooling2D
from keras import backend as K
else:
import tensorflow
import tensorflow.keras as myKeras
from tensorflow.keras.datasets import mnist
from tensorflow.keras.models import Sequential
from tensorflow.keras.layers import Dense,Flatten
from tensorflow.keras.layers import Conv2D,MaxPooling2D
from tensorflow.keras import backend as K
start = time.time()
num_classes = 10
img_rows,img_cols = 28,28
# the data,split between train and test sets
(x_train,y_train),(x_test,y_test) = mnist.load_data()
if K.image_data_format() == 'channels_first':
x_train = x_train.reshape(x_train.shape[0],1,img_rows,img_cols)
x_test = x_test.reshape(x_test.shape[0],img_cols)
input_shape = (1,img_cols)
else:
x_train = x_train.reshape(x_train.shape[0],img_cols,1)
x_test = x_test.reshape(x_test.shape[0],1)
input_shape = (img_rows,1)
x_train = x_train.astype('float32')
x_test = x_test.astype('float32')
x_train /= 255
x_test /= 255
print('x_train shape:',x_train.shape)
print('y_train shape:',y_train.shape)
print(x_train.shape[0],'train samples')
print(x_test.shape[0],'test samples')
y_train = myKeras.utils.to_categorical(y_train,num_classes)
y_test = myKeras.utils.to_categorical(y_test,num_classes)
model = Sequential()
model.add(Conv2D(32,kernel_size=(3,3),activation='relu',input_shape=input_shape))
model.add(Conv2D(64,(3,activation='relu'))
model.add(MaxPooling2D(pool_size=(2,2)))
model.add(Dropout(0.25))
model.add(Flatten())
model.add(Dense(128,activation='relu'))
model.add(Dropout(0.5))
model.add(Dense(num_classes,activation='softmax'))
model.compile(loss=myKeras.losses.categorical_crossentropy,optimizer=myKeras.optimizers.Adadelta(),metrics=['accuracy'])
model.fit(x_train,y_train,batch_size=128,epochs=1,verbose=1,validation_data=(x_test,y_test))
score = model.evaluate(x_test,y_test,verbose=0)
print('Test loss:',score[0])
print('Test accuracy:',score[1])
elapsed_time = time.time() - start
print("elapsed time:{0}".format(elapsed_time))
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