How do I check the number of parameters of a model?

you can see it here: How does one make sure that the custom NN has parameters?

class NN(torch.nn.Module):
    def __init__(self, D_layers,act,w_inits,b_inits,bias=True):
        super(type(self), self).__init__()
        # actiaction func
        self.act = act
        #create linear layers
        self.linear_layers = [None]
        for d in range(1,len(D_layers)):
            linear_layer = torch.nn.Linear(D_layers[d-1], D_layers[d],bias=bias)
            self.linear_layers.append(linear_layer)
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