add bnn_layers to nn.probability
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bingyaweng
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# Copyright 2020 Huawei Technologies Co., Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ============================================================================
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"""
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Bayesian Layer.
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The high-level components(Cells) used to construct the bayesian neural network.
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"""
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from . import conv_variational, dense_variational, layer_distribution, bnn_cell_wrapper
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from .conv_variational import ConvReparam
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from .dense_variational import DenseReparam
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from .layer_distribution import NormalPrior, NormalPosterior
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from .bnn_cell_wrapper import WithBNNLossCell
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__all__ = []
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__all__.extend(conv_variational.__all__)
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__all__.extend(dense_variational.__all__)
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__all__.extend(layer_distribution.__all__)
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__all__.extend(bnn_cell_wrapper.__all__)
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# Copyright 2020 Huawei Technologies Co., Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ============================================================================
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"""Generate WithLossCell suitable for BNN."""
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from .conv_variational import _ConvVariational
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from .dense_variational import _DenseVariational
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from ..transforms.bnn_loss.generate_kl_loss import gain_bnn_with_loss
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__all__ = ['WithBNNLossCell']
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class ClassWrap:
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"""Decorator of WithBNNLossCell"""
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def __init__(self, cls):
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self._cls = cls
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self.bnn_loss_file = None
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def __call__(self, backbone, loss_fn, backbone_factor, kl_factor):
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obj = self._cls(backbone, loss_fn, backbone_factor, kl_factor)
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bnn_with_loss = obj()
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self.bnn_loss_file = obj.bnn_loss_file
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return bnn_with_loss
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@ClassWrap
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class WithBNNLossCell:
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r"""
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Generate WithLossCell suitable for BNN.
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Args:
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backbone (Cell): The target network.
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loss_fn (Cell): The loss function used to compute loss.
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dnn_factor(int, float): The coefficient of backbone's loss, which is computed by loss functin. Default: 1.
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bnn_factor(int, float): The coefficient of kl loss, which is kl divergence of Bayesian layer. Default: 1.
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Inputs:
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- **data** (Tensor) - Tensor of shape :math:`(N, \ldots)`.
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- **label** (Tensor) - Tensor of shape :math:`(N, \ldots)`.
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Outputs:
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Tensor, a scalar tensor with shape :math:`()`.
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Examples:
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>>> net = Net()
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>>> loss_fn = nn.SoftmaxCrossEntropyWithLogits(is_grad=False, sparse=True)
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>>> net_with_criterion_object = WithBNNLossCell(net, loss_fn)
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>>> net_with_criterion = net_with_criterion_object()
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>>>
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>>> batch_size = 2
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>>> data = Tensor(np.ones([batch_size, 3, 64, 64]).astype(np.float32) * 0.01)
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>>> label = Tensor(np.ones([batch_size, 1, 1, 1]).astype(np.int32))
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>>>
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>>> net_with_criterion(data, label)
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"""
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def __init__(self, backbone, loss_fn, dnn_factor=1, bnn_factor=1):
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self.backbone = backbone
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self.loss_fn = loss_fn
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self.dnn_factor = dnn_factor
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self.bnn_factor = bnn_factor
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self.bnn_loss_file = None
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def _generate_loss_cell(self):
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"""Generate WithBNNLossCell by ast."""
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layer_count = self._kl_loss_count(self.backbone)
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bnn_with_loss, self.bnn_loss_file = gain_bnn_with_loss(layer_count, self.backbone, self.loss_fn,
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self.dnn_factor, self.bnn_factor)
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return bnn_with_loss
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def _kl_loss_count(self, net):
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""" Calculate the number of Bayesian layers."""
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count = 0
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for (_, layer) in net.name_cells().items():
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if isinstance(layer, (_DenseVariational, _ConvVariational)):
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count += 1
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else:
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count += self._kl_loss_count(layer)
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return count
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def __call__(self):
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return self._generate_loss_cell()
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# Copyright 2020 Huawei Technologies Co., Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ============================================================================
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"""Convolutional variational layers."""
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from mindspore.ops import operations as P
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from mindspore._checkparam import twice
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from ...layer.conv import _Conv
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from ...cell import Cell
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from .layer_distribution import NormalPrior, NormalPosterior
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__all__ = ['ConvReparam']
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class _ConvVariational(_Conv):
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"""
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Base class for all convolutional variational layers.
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"""
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def __init__(self,
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in_channels,
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out_channels,
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kernel_size,
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stride=1,
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pad_mode='same',
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padding=0,
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dilation=1,
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group=1,
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has_bias=False,
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weight_prior_fn=NormalPrior,
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weight_posterior_fn=lambda name, shape: NormalPosterior(name=name, shape=shape),
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bias_prior_fn=NormalPrior,
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bias_posterior_fn=lambda name, shape: NormalPosterior(name=name, shape=shape)):
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kernel_size = twice(kernel_size)
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stride = twice(stride)
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dilation = twice(dilation)
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super(_ConvVariational, self).__init__(
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in_channels,
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out_channels,
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kernel_size,
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stride,
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pad_mode,
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padding,
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dilation,
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group,
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has_bias,
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weight_init='normal',
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bias_init='zeros'
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)
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if pad_mode not in ('valid', 'same', 'pad'):
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raise ValueError('Attr \'pad_mode\' of \'Conv2d\' Op passed '
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+ str(pad_mode) + ', should be one of values in \'valid\', \'same\', \'pad\'.')
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# convolution args
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self.in_channels = in_channels
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self.out_channels = out_channels
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self.kernel_size = kernel_size
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self.stride = stride
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self.pad_mode = pad_mode
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self.padding = padding
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self.dilation = dilation
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self.group = group
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self.has_bias = has_bias
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# distribution trainable parameters
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self.shape = [self.out_channels,
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self.in_channels // self.group, *self.kernel_size]
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self.weight.requires_grad = False
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if isinstance(weight_prior_fn, Cell):
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self.weight_prior = weight_prior_fn
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else:
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self.weight_prior = weight_prior_fn()
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self.weight_posterior = weight_posterior_fn(shape=self.shape, name='bnn_weight')
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if self.has_bias:
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self.bias.requires_grad = False
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if isinstance(bias_prior_fn, Cell):
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self.bias_prior = bias_prior_fn
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else:
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self.bias_prior = bias_prior_fn()
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self.bias_posterior = bias_posterior_fn(shape=[self.out_channels], name='bnn_bias')
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# mindspore operations
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self.bias_add = P.BiasAdd()
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self.conv2d = P.Conv2D(out_channel=self.out_channels,
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kernel_size=self.kernel_size,
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mode=1,
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pad_mode=self.pad_mode,
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pad=self.padding,
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stride=self.stride,
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dilation=self.dilation,
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group=self.group)
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self.log = P.Log()
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self.sum = P.ReduceSum()
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def construct(self, inputs):
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outputs = self._apply_variational_weight(inputs)
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if self.has_bias:
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outputs = self._apply_variational_bias(outputs)
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return outputs
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def extend_repr(self):
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str_info = 'in_channels={}, out_channels={}, kernel_size={}, weight_mean={}, stride={}, pad_mode={}, ' \
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'padding={}, dilation={}, group={}, weight_std={}, has_bias={}'\
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.format(self.in_channels, self.out_channels, self.kernel_size, self.stride, self.pad_mode, self.padding,
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self.dilation, self.group, self.weight_posterior.mean, self.weight_posterior.untransformed_std,
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self.has_bias)
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if self.has_bias:
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str_info = str_info + ', bias_mean={}, bias_std={}'\
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.format(self.bias_posterior.mean, self.bias_posterior.untransformed_std)
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return str_info
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def _apply_variational_bias(self, inputs):
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bias_posterior_tensor = self.bias_posterior("sample")
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return self.bias_add(inputs, bias_posterior_tensor)
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def compute_kl_loss(self):
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"""Compute kl loss"""
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weight_post_mean = self.weight_posterior("mean")
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weight_post_sd = self.weight_posterior("sd")
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kl = self.weight_prior("kl_loss", "Normal",
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weight_post_mean, weight_post_sd)
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kl_loss = self.sum(kl)
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if self.has_bias:
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bias_post_mean = self.bias_posterior("mean")
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bias_post_sd = self.bias_posterior("sd")
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kl = self.bias_prior("kl_loss", "Normal",
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bias_post_mean, bias_post_sd)
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kl = self.sum(kl)
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kl_loss += kl
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return kl_loss
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class ConvReparam(_ConvVariational):
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r"""
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Convolutional variational layers with Reparameterization.
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See more details in paper `Auto-Encoding Variational Bayes
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<https://arxiv.org/abs/1312.6114>`
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Args:
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in_channels (int): The number of input channel :math:`C_{in}`.
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out_channels (int): The number of output channel :math:`C_{out}`.
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kernel_size (Union[int, tuple[int]]): The data type is int or
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tuple with 2 integers. Specifies the height and width of the 2D
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convolution window. Single int means the value if for both
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height and width of the kernel. A tuple of 2 ints means the
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first value is for the height and the other is for the width of
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the kernel.
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stride(Union[int, tuple[int]]): The distance of kernel moving,
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an int number that represents the height and width of movement
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are both strides, or a tuple of two int numbers that represent
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height and width of movement respectively. Default: 1.
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pad_mode (str): Specifies padding mode. The optional values are
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"same", "valid", "pad". Default: "same".
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- same: Adopts the way of completion. Output height and width
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will be the same as the input.
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Total number of padding will be calculated for horizontal and
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vertical direction and evenly distributed to top and bottom,
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left and right if possible. Otherwise, the last extra padding
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will be done from the bottom and the right side. If this mode
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is set, `padding` must be 0.
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- valid: Adopts the way of discarding. The possibly largest
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height and width of output will be return without padding.
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Extra pixels will be discarded. If this mode is set, `padding`
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must be 0.
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- pad: Implicit paddings on both sides of the input. The number
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of `padding` will be padded to the input Tensor borders.
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`padding` should be greater than or equal to 0.
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padding (Union[int, tuple[int]]): Implicit paddings on both sides of
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the input. Default: 0.
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dilation (Union[int, tuple[int]]): The data type is int or tuple
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with 2 integers. Specifies the dilation rate to use for dilated
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convolution. If set to be :math:`k > 1`,
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there will be :math:`k - 1` pixels skipped for each sampling
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location. Its value should be greater or equal to 1 and bounded
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by the height and width of the input. Default: 1.
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group (int): Split filter into groups, `in_ channels` and
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`out_channels` should be divisible by the number of groups.
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Default: 1.
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has_bias (bool): Specifies whether the layer uses a bias vector.
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Default: False.
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weight_prior_fn: prior distribution for convolution kernel.
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It should return a mindspore distribution instance.
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Default: NormalPrior. (which creates an instance of standard
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normal distribution).
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weight_posterior_fn: posterior distribution for sampling convolution
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kernel. It should be a function handle which returns a mindspore
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distribution instance.
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Default: NormalPosterior.
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bias_prior_fn: prior distribution for bias vector. It should return
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a mindspore distribution.
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Default: NormalPrior(which creates an instance of standard
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normal distribution).
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bias_posterior_fn: posterior distribution for sampling bias vector.
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It should be a function handle which returns a mindspore
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distribution instance.
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Default: NormalPosterior.
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Inputs:
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- **input** (Tensor) - Tensor of shape :math:`(N, C_{in}, H_{in}, W_{in})`.
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Outputs:
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Tensor of shape :math:`(N, C_{out}, H_{out}, W_{out})`.
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Examples:
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Examples:
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>>> net = ConvReparam(120, 240, 4, has_bias=False)
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>>> input = Tensor(np.ones([1, 120, 1024, 640]), mindspore.float32)
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>>> net(input).shape
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(1, 240, 1024, 640)
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"""
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def __init__(
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self,
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in_channels,
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out_channels,
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kernel_size,
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stride=1,
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pad_mode='same',
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padding=0,
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dilation=1,
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group=1,
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has_bias=False,
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weight_prior_fn=NormalPrior,
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weight_posterior_fn=lambda name, shape: NormalPosterior(name=name, shape=shape),
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bias_prior_fn=NormalPrior,
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bias_posterior_fn=lambda name, shape: NormalPosterior(name=name, shape=shape)):
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super(ConvReparam, self).__init__(
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in_channels,
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out_channels,
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kernel_size,
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stride=stride,
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pad_mode=pad_mode,
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padding=padding,
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dilation=dilation,
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group=group,
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has_bias=has_bias,
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weight_prior_fn=weight_prior_fn,
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weight_posterior_fn=weight_posterior_fn,
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bias_prior_fn=bias_prior_fn,
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bias_posterior_fn=bias_posterior_fn
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)
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def _apply_variational_weight(self, inputs):
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weight_posterior_tensor = self.weight_posterior("sample")
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outputs = self.conv2d(inputs, weight_posterior_tensor)
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return outputs
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@ -0,0 +1,188 @@
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# Copyright 2020 Huawei Technologies Co., Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
|
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# You may obtain a copy of the License at
|
||||
#
|
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
|
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
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# limitations under the License.
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# ============================================================================
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"""dense_variational"""
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from mindspore.ops import operations as P
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from mindspore._checkparam import check_int_positive, check_bool
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from ...cell import Cell
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from ...layer.activation import get_activation
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from .layer_distribution import NormalPrior, NormalPosterior
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__all__ = ['DenseReparam']
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class _DenseVariational(Cell):
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"""
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Base class for all dense variational layers.
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"""
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def __init__(
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self,
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in_channels,
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out_channels,
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activation=None,
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has_bias=True,
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weight_prior_fn=NormalPrior,
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weight_posterior_fn=lambda name, shape: NormalPosterior(name=name, shape=shape),
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bias_prior_fn=NormalPrior,
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bias_posterior_fn=lambda name, shape: NormalPosterior(name=name, shape=shape)):
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super(_DenseVariational, self).__init__()
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self.in_channels = check_int_positive(in_channels)
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self.out_channels = check_int_positive(out_channels)
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self.has_bias = check_bool(has_bias)
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if isinstance(weight_prior_fn, Cell):
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self.weight_prior = weight_prior_fn
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else:
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self.weight_prior = weight_prior_fn()
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self.weight_posterior = weight_posterior_fn(shape=[self.out_channels, self.in_channels], name='bnn_weight')
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if self.has_bias:
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if isinstance(bias_prior_fn, Cell):
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self.bias_prior = bias_prior_fn
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else:
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self.bias_prior = bias_prior_fn()
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self.bias_posterior = bias_posterior_fn(shape=[self.out_channels], name='bnn_bias')
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self.activation = activation
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if isinstance(self.activation, str):
|
||||
self.activation = get_activation(activation)
|
||||
self.activation_flag = self.activation is not None
|
||||
|
||||
self.matmul = P.MatMul(transpose_b=True)
|
||||
self.bias_add = P.BiasAdd()
|
||||
self.sum = P.ReduceSum()
|
||||
|
||||
def construct(self, x):
|
||||
outputs = self._apply_variational_weight(x)
|
||||
if self.has_bias:
|
||||
outputs = self._apply_variational_bias(outputs)
|
||||
if self.activation_flag:
|
||||
outputs = self.activation(outputs)
|
||||
return outputs
|
||||
|
||||
def extend_repr(self):
|
||||
str_info = 'in_channels={}, out_channels={}, weight_mean={}, weight_std={}, has_bias={}' \
|
||||
.format(self.in_channels, self.out_channels, self.weight_posterior.mean,
|
||||
self.weight_posterior.untransformed_std, self.has_bias)
|
||||
if self.has_bias:
|
||||
str_info = str_info + ', bias_mean={}, bias_std={}' \
|
||||
.format(self.bias_posterior.mean, self.bias_posterior.untransformed_std)
|
||||
|
||||
if self.activation_flag:
|
||||
str_info = str_info + ', activation={}'.format(self.activation)
|
||||
return str_info
|
||||
|
||||
def _apply_variational_bias(self, inputs):
|
||||
bias_posterior_tensor = self.bias_posterior("sample")
|
||||
return self.bias_add(inputs, bias_posterior_tensor)
|
||||
|
||||
def compute_kl_loss(self):
|
||||
"""Compute kl loss."""
|
||||
weight_post_mean = self.weight_posterior("mean")
|
||||
weight_post_sd = self.weight_posterior("sd")
|
||||
|
||||
kl = self.weight_prior("kl_loss", "Normal", weight_post_mean, weight_post_sd)
|
||||
kl_loss = self.sum(kl)
|
||||
if self.has_bias:
|
||||
bias_post_mean = self.bias_posterior("mean")
|
||||
bias_post_sd = self.bias_posterior("sd")
|
||||
|
||||
kl = self.bias_prior("kl_loss", "Normal", bias_post_mean, bias_post_sd)
|
||||
kl = self.sum(kl)
|
||||
kl_loss += kl
|
||||
return kl_loss
|
||||
|
||||
|
||||
class DenseReparam(_DenseVariational):
|
||||
r"""
|
||||
Dense variational layers with Reparameterization.
|
||||
|
||||
See more details in paper `Auto-Encoding Variational Bayes
|
||||
<https://arxiv.org/abs/1312.6114>`
|
||||
|
||||
Applies dense-connected layer for the input. This layer implements the operation as:
|
||||
|
||||
.. math::
|
||||
\text{outputs} = \text{activation}(\text{inputs} * \text{kernel} + \text{bias}),
|
||||
|
||||
where :math:`\text{activation}` is the activation function passed as the activation
|
||||
argument (if passed in), :math:`\text{activation}` is a weight matrix with the same
|
||||
data type as the inputs created by the layer, :math:`\text{weight}` is a weight
|
||||
matrix sampling from posterior distribution of weight, and :math:`\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
|
||||
:math:`\text{bias}`.
|
||||
|
||||
Args:
|
||||
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): Regularizer function applied to the output of the layer, eg. 'relu'. Default: None.
|
||||
weight_prior_fn: prior distribution for weight.
|
||||
It should return a mindspore distribution instance.
|
||||
Default: NormalPrior. (which creates an instance of standard
|
||||
normal distribution).
|
||||
weight_posterior_fn: posterior distribution for sampling weight.
|
||||
It should be a function handle which returns a mindspore
|
||||
distribution instance.
|
||||
Default: NormalPosterior.
|
||||
bias_prior_fn: prior distribution for bias vector. It should return
|
||||
a mindspore distribution.
|
||||
Default: NormalPrior(which creates an instance of standard
|
||||
normal distribution).
|
||||
bias_posterior_fn: posterior distribution for sampling bias vector.
|
||||
It should be a function handle which returns a mindspore
|
||||
distribution instance.
|
||||
Default: NormalPosterior.
|
||||
|
||||
Inputs:
|
||||
- **input** (Tensor) - Tensor of shape :math:`(N, in\_channels)`.
|
||||
|
||||
Outputs:
|
||||
Tensor of shape :math:`(N, out\_channels)`.
|
||||
|
||||
Examples:
|
||||
>>> net = DenseReparam(3, 4)
|
||||
>>> input = Tensor(np.random.randint(0, 255, [2, 3]), mindspore.float32)
|
||||
>>> net(input)
|
||||
"""
|
||||
|
||||
def __init__(
|
||||
self,
|
||||
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)):
|
||||
super(DenseReparam, self).__init__(
|
||||
in_channels,
|
||||
out_channels,
|
||||
activation=activation,
|
||||
has_bias=has_bias,
|
||||
weight_prior_fn=weight_prior_fn,
|
||||
weight_posterior_fn=weight_posterior_fn,
|
||||
bias_prior_fn=bias_prior_fn,
|
||||
bias_posterior_fn=bias_posterior_fn
|
||||
)
|
||||
|
||||
def _apply_variational_weight(self, inputs):
|
||||
weight_posterior_tensor = self.weight_posterior("sample")
|
||||
outputs = self.matmul(inputs, weight_posterior_tensor)
|
||||
return outputs
|
||||
|
|
@ -0,0 +1,96 @@
|
|||
# Copyright 2020 Huawei Technologies Co., Ltd
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
# ============================================================================
|
||||
"""Initialize normal distributions"""
|
||||
import numpy as np
|
||||
import mindspore.common.dtype as mstype
|
||||
from mindspore.common.tensor import Tensor
|
||||
from mindspore.common.parameter import Parameter
|
||||
from mindspore.ops import operations as P
|
||||
from ...cell import Cell
|
||||
from ..distribution.normal import Normal
|
||||
|
||||
__all__ = ['NormalPrior', 'NormalPosterior']
|
||||
|
||||
|
||||
class NormalPrior(Cell):
|
||||
r"""
|
||||
To initialize a normal distribution of mean 0 and standard deviation 0.1.
|
||||
|
||||
Args:
|
||||
dtype (class `mindspore.dtype`): The argument is used to define the data type of the output tensor.
|
||||
Default: mindspore.float32.
|
||||
mean (int, float): Mean of normal distribution.
|
||||
std (int, float): Standard deviation of normal distribution.
|
||||
|
||||
Returns:
|
||||
Cell, a normal distribution.
|
||||
"""
|
||||
def __init__(self, dtype=mstype.float32, mean=0, std=0.1):
|
||||
super(NormalPrior, self).__init__()
|
||||
self.normal = Normal(mean, std, dtype=dtype)
|
||||
|
||||
def construct(self, *inputs):
|
||||
return self.normal(*inputs)
|
||||
|
||||
|
||||
class NormalPosterior(Cell):
|
||||
r"""
|
||||
Build Normal distributions with trainable parameters.
|
||||
|
||||
Args:
|
||||
name (str): Name prepended to trainable parameter.
|
||||
shape (list): Shape of the mean and standard deviation.
|
||||
dtype (class `mindspore.dtype`): The argument is used to define the data type of the output tensor.
|
||||
Default: mindspore.float32.
|
||||
loc_mean ( float, array_like of floats): Mean of distribution to initialize trainable parameters. Default: 0.
|
||||
loc_std ( float, array_like of floats): Standard deviation of distribution to initialize trainable parameters.
|
||||
Default: 0.1.
|
||||
untransformed_scale_mean ( float, array_like of floats): Mean of distribution to initialize trainable
|
||||
parameters. Default: -5.
|
||||
untransformed_scale_std ( float, array_like of floats): Standard deviation of distribution to initialize
|
||||
trainable parameters. Default: 0.1.
|
||||
|
||||
Returns:
|
||||
Cell, a normal distribution.
|
||||
"""
|
||||
def __init__(self,
|
||||
name,
|
||||
shape,
|
||||
dtype=mstype.float32,
|
||||
loc_mean=0,
|
||||
loc_std=0.1,
|
||||
untransformed_scale_mean=-5,
|
||||
untransformed_scale_std=0.1):
|
||||
super(NormalPosterior, self).__init__()
|
||||
if not isinstance(name, str):
|
||||
raise ValueError('The type of `name` should be `str`')
|
||||
|
||||
self.mean = Parameter(
|
||||
Tensor(np.random.normal(loc_mean, loc_std, shape), dtype=dtype), name=name + '_mean')
|
||||
|
||||
self.untransformed_std = Parameter(
|
||||
Tensor(np.random.normal(untransformed_scale_mean, untransformed_scale_std, shape), dtype=dtype),
|
||||
name=name + '_untransformed_std')
|
||||
|
||||
self.normal = Normal()
|
||||
|
||||
def std_trans(self, std_pre):
|
||||
"""Transform std_pre to prevent its value being zero."""
|
||||
std = 1e-6 + P.Log()(P.Exp()(std_pre) + 1)
|
||||
return std
|
||||
|
||||
def construct(self, *inputs):
|
||||
std = self.std_trans(self.untransformed_std)
|
||||
return self.normal(*inputs, mean=self.mean, sd=std)
|
||||
|
|
@ -21,6 +21,7 @@ from mindspore.common import dtype as mstype
|
|||
from mindspore.ops import operations as P
|
||||
from mindspore.ops import composite as C
|
||||
import mindspore.nn as nn
|
||||
import mindspore.nn.probability as msp
|
||||
|
||||
def cast_to_tensor(t, hint_dtype=mstype.float32):
|
||||
"""
|
||||
|
|
@ -84,7 +85,7 @@ def check_scalar_from_param(params):
|
|||
Notes: String parameters are excluded.
|
||||
"""
|
||||
for value in params.values():
|
||||
if isinstance(value, (nn.probability.bijector.Bijector, nn.probability.distribution.Distribution)):
|
||||
if isinstance(value, (msp.bijector.Bijector, msp.distribution.Distribution)):
|
||||
return params['distribution'].is_scalar_batch
|
||||
if isinstance(value, Parameter):
|
||||
return False
|
||||
|
|
@ -109,7 +110,7 @@ def calc_broadcast_shape_from_param(params):
|
|||
"""
|
||||
broadcast_shape = []
|
||||
for value in params.values():
|
||||
if isinstance(value, (nn.probability.bijector.Bijector, nn.probability.distribution.Distribution)):
|
||||
if isinstance(value, (msp.bijector.Bijector, msp.distribution.Distribution)):
|
||||
return params['distribution'].broadcast_shape
|
||||
if isinstance(value, (str, type(params['dtype']))):
|
||||
continue
|
||||
|
|
|
|||
|
|
@ -36,7 +36,7 @@ class _CodeTransformer(ast.NodeTransformer):
|
|||
def visit_FunctionDef(self, node):
|
||||
"""visit function and add kl_loss computation."""
|
||||
self.generic_visit(node)
|
||||
if node.name == 'compute_kl_loss':
|
||||
if node.name == 'cal_kl_loss':
|
||||
for i in range(self.layer_count):
|
||||
func = ast.Assign(targets=[ast.Name(id='loss', ctx=ast.Store())],
|
||||
value=ast.BinOp(left=ast.Name(id='loss', ctx=ast.Load()), op=ast.Add(),
|
||||
|
|
@ -71,7 +71,7 @@ def gain_bnn_with_loss(layer_count, backbone, loss_fn, dnn_factor, bnn_factor):
|
|||
layer_count (int): The number of kl loss to be generated, namely the number of Bayesian layers.
|
||||
backbone (Cell): The target network to wrap.
|
||||
loss_fn (Cell): The loss function used to compute loss.
|
||||
dnn_factor ((int, float): The coefficient of backbone's loss, which is computed by loss function.
|
||||
dnn_factor (int, float): The coefficient of backbone's loss, which is computed by loss function.
|
||||
bnn_factor (int, float): The coefficient of kl loss, which is kl divergence of Bayesian layer.
|
||||
"""
|
||||
bnn_loss_func = _generate_kl_loss_func(layer_count)
|
||||
|
|
|
|||
|
|
@ -14,3 +14,4 @@ opencv-python >= 4.1.2.30 # for ut test
|
|||
sklearn >= 0.0 # for st test
|
||||
pandas >= 1.0.2 # for ut test
|
||||
bs4
|
||||
astunparse
|
||||
|
|
|
|||
Loading…
Reference in New Issue