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mindspore.nn.probability.bnn_layers.WithBNNLossCell

class mindspore.nn.probability.bnn_layers.WithBNNLossCell(backbone, loss_fn, dnn_factor=1, bnn_factor=1)

Generate a suitable WithLossCell for BNN to wrap the bayesian network with loss function.

Parameters

• backbone (Cell) – The target network.

• loss_fn (Cell) – The loss function used to compute loss.

• dnn_factor (int, float) – The coefficient of backbone’s loss, which is computed by the loss function. Default: 1.

• bnn_factor (int, float) – The coefficient of KL loss, which is the KL divergence of Bayesian layer. Default: 1.

Inputs:

• data (Tensor) - Tensor of shape $(N,\dots )$.

• label (Tensor) - Tensor of shape $(N,\dots )$.

Outputs:

Tensor, a scalar tensor with shape $()$.

Supported Platforms:

Ascend GPU

Examples

>>> net = Net()
>>> loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=False)
>>> net_with_criterion = WithBNNLossCell(net, loss_fn)
>>>
>>> batch_size = 2
>>> data = Tensor(np.ones([batch_size, 16]).astype(np.float32) * 0.01)
>>> label = Tensor(np.ones([batch_size, 1]).astype(np.float32))
>>>
>>> net_with_criterion(data, label)

property backbone_network

Returns the backbone network.

Returns

Cell, the backbone network.