我正在做一个张量流项目。但我遇到了无法解决的错误。
当我改变损失函数时
来自
def custom_loss(y_true,y_pred):
L1_loss = keras.mean(keras.abs(y_true - y_pred), axis=-1)
ssim_loss = 1 - (tf.reduce_mean(tf.image.ssim(y_true, y_pred, max_val=1.0, filter_size=5)))
loss = L1_loss + 2.0 * SSIM_loss
return loss
到
def custom_loss(deltaT1):
def total_loss(y_true,y_pred):
L1_loss = keras.mean(keras.abs(y_true - y_pred), axis=-1)
ssim_loss = 1 - (tf.reduce_mean(tf.image.ssim(y_true, y_pred, max_val=1.0, filter_size=5)))
mask_loss = keras.mean(keras.abs(y_true-y_pred)*deltaT1,axis=-1)
loss = 1.0 * L1_loss + 5.0 * ssim_loss + 1.0 * mask_loss
return loss
return total_loss
我会看到此错误消息
`类型错误:在用户代码中:
File "/usr/local/lib/python3.10/dist-packages/keras/engine/training.py", line 1284, in train_function *
return step_function(self, iterator)
File "/usr/local/lib/python3.10/dist-packages/keras/engine/training.py", line 1268, in step_function **
outputs = model.distribute_strategy.run(run_step, args=(data,))
File "/usr/local/lib/python3.10/dist-packages/keras/engine/training.py", line 1249, in run_step **
outputs = model.train_step(data)
File "/usr/local/lib/python3.10/dist-packages/keras/engine/training.py", line 1051, in train_step
loss = self.compute_loss(x, y, y_pred, sample_weight)
File "/usr/local/lib/python3.10/dist-packages/keras/engine/training.py", line 1109, in compute_loss
return self.compiled_loss(
File "/usr/local/lib/python3.10/dist-packages/keras/engine/compile_utils.py", line 317, in __call__
self._total_loss_mean.update_state(
File "/usr/local/lib/python3.10/dist-packages/keras/utils/metrics_utils.py", line 77, in decorated
update_op = update_state_fn(*args, **kwargs)
File "/usr/local/lib/python3.10/dist-packages/keras/metrics/base_metric.py", line 140, in update_state_fn
return ag_update_state(*args, **kwargs)
File "/usr/local/lib/python3.10/dist-packages/keras/metrics/base_metric.py", line 477, in update_state **
sample_weight = tf.__internal__.ops.broadcast_weights(
File "/usr/local/lib/python3.10/dist-packages/keras/engine/keras_tensor.py", line 283, in __array__
raise TypeError(
TypeError: You are passing KerasTensor(type_spec=TensorSpec(shape=(), dtype=tf.float32, name=None), name='Placeholder:0', description="created by layer 'tf.cast_5'"), an intermediate Keras symbolic input/output, to a TF API that does not allow registering custom dispatchers, such as `tf.cond`, `tf.function`, gradient tapes, or `tf.map_fn`. Keras Functional model construction only supports TF API calls that *do* support dispatching, such as `tf.math.add` or `tf.reshape`. Other APIs cannot be called directly on symbolic Kerasinputs/outputs. You can work around this limitation by putting the operation in a custom Keras layer `call` and calling that layer on this symbolic input/output.`
这是我的模型。贴合功能
model.compile(optimizer=optimizer, loss=custom_loss(mask), metrics=metrics)
....
with tf.device('/gpu:0'):
history = model.fit(train_img_datagen,
steps_per_epoch=steps_per_epoch,
epochs=epochs,
verbose=1,
validation_data=val_img_datagen,
validation_steps=val_steps_per_epoch,
callbacks=[callbacks])
你能帮我吗?
这是TensorFlow版本导致的问题吗?因为在我添加 deltaT1 后出错了,我模仿这个存储库的第 41 行编写了它。 https://github.com/chenchao666/Contrast-enhanced-MRI-Synthesis/blob/master/HRNet(3D)/utils.py
当模型的输出与您正在使用的损失函数之间不匹配时,错误消息“TypeError:您正在传递 KerasTensor”通常会出现在深度学习模型中。当您更改损失函数并且计算中涉及的张量的形状或类型不再兼容时,通常会出现此错误。
以下是您可能遇到此错误的一些常见原因以及解决方法:
输出和损失函数不匹配:
损失函数参数:
模型架构:
数据预处理:
标签格式:
调试与打印:
以下是在更改 Keras 模型中的损失函数时如何调整代码的示例:
# Example: Changing loss function from mean squared error to categorical cross-entropy
# Original model with MSE loss
model = Sequential()
model.add(Dense(10, input_shape=(input_dim,)))
model.compile(optimizer='adam', loss='mean_squared_error')
# Updated model with categorical cross-entropy loss
model = Sequential()
model.add(Dense(10, input_shape=(input_dim,), activation='softmax')) # Adjust the output layer
model.compile(optimizer='adam', loss='categorical_crossentropy')
# Ensure your data preprocessing and labels match the new loss function.
通过仔细检查和调整模型的架构、数据预处理和目标标签以匹配新损失函数的要求,您应该能够解决“TypeError”问题。