mindspore.nn.probability.bnn_layers.DenseReparam
- class mindspore.nn.probability.bnn_layers.DenseReparam(in_channels, out_channels, activation=None, has_bias=True, weight_prior_fn=NormalPrior, weight_posterior_fn=<lambda name, shape: NormalPosterior(name=name, shape=shape)>, bias_prior_fn=NormalPrior, bias_posterior_fn=<lambda name, shape: NormalPosterior(name=name, shape=shape)>)[source]
Dense variational layers with Reparameterization.
For more details, refer to the paper Auto-Encoding Variational Bayes.
Applies dense-connected layer to the input. This layer implements the operation as:
\[\text{outputs} = \text{activation}(\text{inputs} * \text{weight} + \text{bias}),\]where \(\text{activation}\) is the activation function passed as the activation argument (if passed in), \(\text{activation}\) is a weight matrix with the same data type as the inputs created by the layer, \(\text{weight}\) is a weight matrix sampling from posterior distribution of weight, and \(\text{bias}\) is a bias vector with the same data type as the inputs created by the layer (only if has_bias is True). The bias vector is sampling from posterior distribution of \(\text{bias}\).
- Parameters
in_channels (int) – The number of input channel.
out_channels (int) – The number of output channel .
has_bias (bool) – Specifies whether the layer uses a bias vector. Default: False.
activation (str, Cell) – A regularization function applied to the output of the layer. The type of activation can be a string (eg. ‘relu’) or a Cell (eg. nn.ReLU()). Note that if the type of activation is Cell, it must be instantiated beforehand. Default: None.
weight_prior_fn – The prior distribution for weight. It must return a mindspore distribution instance. Default: NormalPrior. (which creates an instance of standard normal distribution). The current version only supports normal distribution.
weight_posterior_fn – The posterior distribution for sampling weight. It must be a function handle which returns a mindspore distribution instance. Default: lambda name, shape: NormalPosterior(name=name, shape=shape). The current version only supports normal distribution.
bias_prior_fn – The prior distribution for bias vector. It must return a mindspore distribution. Default: NormalPrior(which creates an instance of standard normal distribution). The current version only supports normal distribution.
bias_posterior_fn – The posterior distribution for sampling bias vector. It must be a function handle which returns a mindspore distribution instance. Default: lambda name, shape: NormalPosterior(name=name, shape=shape). The current version only supports normal distribution.
- Inputs:
input (Tensor) - The shape of the tensor is \((N, in\_channels)\).
- Outputs:
Tensor, the shape of the tensor is \((N, out\_channels)\).
- Supported Platforms:
Ascend
GPU
Examples
>>> net = DenseReparam(3, 4) >>> input = Tensor(np.random.randint(0, 255, [2, 3]), mindspore.float32) >>> output = net(input).shape >>> print(output) (2, 4)