RuntimeError: For ’Optimizer’, the argument group params must not be empty.

from mindspore import nn

net = Net()
conv_params = list(filter(lambda x: 'conv' in x.name, net.trainable_params()))
no_conv_params = list(filter(lambda x: 'conv' not in x.name, net.trainable_params()))
group_params = [{'params': conv_params, 'lr': 0.05},{'params': no_conv_params, 'lr': 0.01}]
optim = nn.Momentum(group_params, learning_rate=0.1, momentum=0.9, weight_decay=0.0)
conv_lr = optim.get_lr_parameter(conv_params)
print(conv_lr[0].asnumpy())