如何在keras中为某些层加载多个权重？

from keras.models import Model
from keras.layers import Dense, Input

input_layer = Input(shape=(input_shape,))
hidden_layer = Dense(hidden_units, activation='relu')(input_layer)
output_layer = Dense(output_units, activation='softmax')(hidden_layer)

model = Model(inputs=input_layer, outputs=output_layer)

model.load_weights('path_to_weights_file1.h5', by_name=True)

layer_names = ['layer1', 'layer2', 'layer3']

for layer_name in layer_names:
    layer = model.get_layer(layer_name)
    layer.load_weights('path_to_weights_file2.h5', by_name=True)