TypeError: Failed to instantiate <class 'lasagne.layers.pool.MaxPool2DLayer'> with args {'name': 'pool1', 'ds': (2, 2), 'incoming': <lasagne.layers.conv.Conv2DLayer object at 0x7ff765fa29e8>}. Maybe parameter names have changed?

[HariGopal191]

from lasagne import layers
layers=[
('input', layers.InputLayer),
('conv1', layers.Conv2DLayer),
('pool1', layers.MaxPool2DLayer),
('conv2', layers.Conv2DLayer),
('pool2', layers.MaxPool2DLayer),
('conv3', layers.Conv2DLayer),
('pool3', layers.MaxPool2DLayer),
('hidden4', layers.DenseLayer),
('hidden5', layers.DenseLayer),
('output', layers.DenseLayer),
]

from nolearn.lasagne import NeuralNet
nnet = NeuralNet(layers=layers,input_shape=(None, 3, 32, 32),conv1_num_filters=32,
conv1_filter_size=(3, 3),
conv2_num_filters=64,
conv2_filter_size=(2, 2),
conv3_num_filters=128,
conv3_filter_size=(2, 2),
pool1_ds=(2,2),
pool2_ds=(2,2),
pool3_ds=(2,2),
hidden4_num_units=500,
hidden5_num_units=500,
output_num_units=10,
output_nonlinearity=softmax,
update_learning_rate=0.01,
update_momentum=0.9,
regression=True,
max_epochs=3,
verbose=1)

nnet.fit(X_train, y_train)

TypeError: Failed to instantiate <class 'lasagne.layers.pool.MaxPool2DLayer'> with args {'name': 'pool1', 'ds': (2, 2), 'incoming': <lasagne.layers.conv.Conv2DLayer object at 0x7ff765fa29e8>}. Maybe parameter names have changed?

i am dealing with this error. any help!!