TypeError: The added layer must be an instance of class Layer. Found: <keras.engine.training.Model object at XXXXXXXX>

エラー内容

コード

from keras.applications.resnet50 import ResNet50
from tensorflow.keras.models import Sequential

resnet = ResNet50(include_top=False, pooling='avg', weights='imagenet')
my_new_model = Sequential()
my_new_model.add(resnet)

エラー

TypeError: The added layer must be an instance of class Layer. Found: <keras.engine.training.Model object at XXXXXXXX>

原因

kerasとtensorflow.kerasを同時に使っていたからだと思う。

解決

from tensorflow.keras.applications.resnet50 import ResNet50
from tensorflow.keras.models import Sequential

resnet = ResNet50(include_top=False, pooling='avg', weights='imagenet')
my_new_model = Sequential()
my_new_model.add(resnet)