我是深度学习和 TFF 的新手。我需要使用 CNN 对来自 EMNIST 的图像进行分类。我在 GitHub 上看到了名为 Federated Learning for Image Classification 的教程。我创建了一个名为 CNN 的网络,然后我使用 forward_pass 函数来实例化一个 cnn 模型来计算预测。但是 TFF 需要将模型变量作为可训练变量传递给 tff.learning.Model。我打印 CNN model.variables。我不知道如何命名,所以我使用 cnn_conv2d_kernel 来表示 cnn/conv2d/kernel。这是我的代码:
打印的model.variables:
variables: [<tf.Variable 'cnn/conv2d/kernel:0' shape=(5, 5, 1, 32) dtype=float32>, <tf.Variable 'cnn/conv2d/bias:0' shape=(32,) dtype=float32>, <tf.Variable 'cnn/conv2d_1/kernel:0' shape=(5, 5, 32, 64) dtype=float32>, <tf.Variable 'cnn/conv2d_1/bias:0' shape=(64,) dtype=float32>, <tf.Variable 'cnn/dense/kernel:0' shape=(3136, 1024) dtype=float32>, <tf.Variable 'cnn/dense/bias:0' shape=(1024,) dtype=float32>, <tf.Variable 'cnn/dense_1/kernel:0' shape=(1024, 10) dtype=float32>, <tf.Variable 'cnn/dense_1/bias:0' shape=(10,) dtype=float32>]
我创建的变量是为了将可训练和不可训练变量传递给 tff.learning.Model:
MnistVariables = collections.namedtuple(
'MnistVariables','cnn_conv2d_kernel cnn_conv2d_bias cnn_conv2d_1_kernel cnn_conv2d_1_bias cnn_dense_kernel cnn_dense_bias cnn_dense_1_kernel cnn_dense_1_bias num_examples loss_sum accuracy_sum'
)
def create_mnist_variables():
return MnistVariables(
# weights=tf.Variable(
# # lambda: tf.zeros(dtype=tf.float32, shape=(784,10)),
# lambda: tf.zeros(dtype=tf.float32, shape=(28,28,10)),
# name='weights',
# trainable=True),
# bias=tf.Variable(
# lambda: tf.zeros(dtype=tf.float32, shape=(10)),
# name='bias',
# trainable=True),
cnn_conv2d_kernel=tf.Variable(
# lambda: tf.zeros(dtype=tf.float32, shape=(784,10)),
lambda: tf.zeros(dtype=tf.float32, shape=(5,5,1,32)),
name='cnn_conv2d_kernel',
trainable=True),
cnn_conv2d_bias=tf.Variable(
# lambda: tf.zeros(dtype=tf.float32, shape=(784,10)),
lambda: tf.zeros(dtype=tf.float32, shape=(32,)),
name='cnn_conv2d_bias',
trainable=True),
cnn_conv2d_1_kernel=tf.Variable(
# lambda: tf.zeros(dtype=tf.float32, shape=(784,10)),
lambda: tf.zeros(dtype=tf.float32, shape=(5,5,32,64)),
name='cnn_conv2d_1_kernel',
trainable=True),
cnn_conv2d_1_bias=tf.Variable(
# lambda: tf.zeros(dtype=tf.float32, shape=(784,10)),
lambda: tf.zeros(dtype=tf.float32, shape=(64,)),
name='cnn_conv2d_1_bias',
trainable=True),
cnn_dense_kernel=tf.Variable(
# lambda: tf.zeros(dtype=tf.float32, shape=(784,10)),
lambda: tf.zeros(dtype=tf.float32, shape=(3136,1024)),
name='cnn_dense_kernel',
trainable=True),
cnn_dense_bias=tf.Variable(
# lambda: tf.zeros(dtype=tf.float32, shape=(784,10)),
lambda: tf.zeros(dtype=tf.float32, shape=(1024,)),
name='cnn_dense_bias',
trainable=True),
cnn_dense_1_kernel=tf.Variable(
# lambda: tf.zeros(dtype=tf.float32, shape=(784,10)),
lambda: tf.zeros(dtype=tf.float32, shape=(1024,10)),
name='cnn_dense_1_kernel',
trainable=True),
cnn_dense_1_bias=tf.Variable(
# lambda: tf.zeros(dtype=tf.float32, shape=(784,10)),
lambda: tf.zeros(dtype=tf.float32, shape=(10,)),
name='cnn_dense_1_bias',
trainable=True),
num_examples=tf.Variable(0.0, name='num_examples', trainable=False),
loss_sum=tf.Variable(0.0, name='loss_sum', trainable=False),
accuracy_sum=tf.Variable(0.0, name='accuracy_sum', trainable=False)
)
我的部分 tff.learning.Model 代码:
class MnistModel(tff.learning.Model):
def __init__(self):
self._variables = create_mnist_variables()
#所有的“tf.Variables”都应该在“__init__”中引入
@property
def trainable_variables(self):
#return [self._variables.weights, self._variables.bias]
return [self._variables.cnn_conv2d_kernel,
self._variables.cnn_conv2d_bias,
self._variables.cnn_conv2d_1_kernel,
self._variables.cnn_conv2d_1_bias,
self._variables.cnn_dense_kernel,
self._variables.cnn_dense_bias,
self._variables.cnn_dense_1_kernel,
self._variables.cnn_dense_1_bias
]
请原谅我糟糕的英语并请帮助我。(请)
现在,我有一个新问题:
ValueError: No gradients provided for any variable: ['cnn_conv2d_kernel:0', 'cnn_conv2d_bias:0', 'cnn_conv2d_1_kernel:0', 'cnn_conv2d_1_bias:0', 'cnn_dense_kernel:0', 'cnn_dense_bias:0', 'cnn_dense_1_kernel:0', 'cnn_dense_1_bias:0'].