将分类器添加到 MobileNet 模型时出现检索错误答案

【问题标题】：Issue retrieving error when adding a classifier to a MobileNet model将分类器添加到 MobileNet 模型时出现检索错误
【发布时间】：2021-05-29 16:20:32
【问题描述】：

我有以下代码，当我尝试添加自己的分类器时出现错误。

import keras
from keras import layers,Model
from keras.layers import Input,GlobalAveragePooling2D,Flatten,Dense
MobileNetV2_model= tf.keras.applications.MobileNetV2(input_shape=None, alpha=1.0, include_top=False, 
weights='imagenet')
#MobileNetV2_model.summary()
x= MobileNetV2_model.output
x = layers.GlobalAveragePooling2D()(x)
final_output=layers.Dense(2, activation='sigmoid')(x)
model = keras.Model(inputs=MobileNetV2.input, outputs = final_output)
model.compile(optimizer="adam", loss='BinaryCrossentropy', metrics=['accuracy'],loss_weights=0.1)

错误

   TypeError: Cannot convert a symbolic Keras input/output to a numpy array. This error may indicate that 
   you're trying to pass a symbolic value to a NumPy call, which is not supported. Or, you may be trying 
   to pass Keras symbolic inputs/outputs to a TF API that does not register dispatching, preventing Keras from automatically converting the API call to a lambda layer in the Functional Model.

【问题讨论】：

这可能因为你正在混合keras和tf.keras。

标签： tensorflow machine-learning keras conv-neural-network

【解决方案1】：

您不应该混合使用 keras 和 tf.keras。您可以参考如下所示的工作代码

import tensorflow as tf
from tensorflow.keras import layers, Model

MobileNetV2_model= tf.keras.applications.MobileNetV2(input_shape=(224,224,3), alpha=1.0, include_top=False, weights='imagenet')

#MobileNetV2_model.summary()
x= MobileNetV2_model.output
x = layers.GlobalAveragePooling2D()(x)
final_output=layers.Dense(2, activation='sigmoid')(x)

model = Model(inputs=MobileNetV2_model.input, outputs = final_output)
model.compile(optimizer="adam", loss='BinaryCrossentropy', metrics=['accuracy'],loss_weights=0.1)

【讨论】：