Python nn.bias_add函数代码示例

  def call(self, inputs):
    outputs = nn.convolution(
        input=inputs,
        filter=self.masked_kernel,
        dilation_rate=self.dilation_rate,
        strides=self.strides,
        padding=self.padding.upper(),
        data_format=utils.convert_data_format(self.data_format, self.rank + 2))

    if self.bias is not None:
      if self.data_format == 'channels_first':
        if self.rank == 1:
          # nn.bias_add does not accept a 1D input tensor.
          bias = array_ops.reshape(self.bias, (1, self.filters, 1))
          outputs += bias
        if self.rank == 2:
          outputs = nn.bias_add(outputs, self.bias, data_format='NCHW')
        if self.rank == 3:
          # As of Mar 2017, direct addition is significantly slower than
          # bias_add when computing gradients. To use bias_add, we collapse Z
          # and Y into a single dimension to obtain a 4D input tensor.
          outputs_shape = outputs.shape.as_list()
          outputs_4d = array_ops.reshape(outputs, [
              outputs_shape[0], outputs_shape[1],
              outputs_shape[2] * outputs_shape[3], outputs_shape[4]
          ])
          outputs_4d = nn.bias_add(outputs_4d, self.bias, data_format='NCHW')
          outputs = array_ops.reshape(outputs_4d, outputs_shape)
      else:
        outputs = nn.bias_add(outputs, self.bias, data_format='NHWC')

    if self.activation is not None:
      return self.activation(outputs)
    return outputs

def _conv_pool(x):
  """(Conv -> bias -> relu -> max_pool) x2."""
  x_image = array_ops.reshape(x, [-1, 8, 8, 1])
  w_conv1 = _weight([3, 3, 1, 6])
  b_conv1 = _bias([6])
  h_conv1 = nn.relu(nn.bias_add(_conv2d(x_image, w_conv1), b_conv1))
  h_pool1 = _max_pool_2x2(h_conv1)
  w_conv2 = _weight([3, 3, 6, 4])
  b_conv2 = _bias([4])
  h_conv2 = nn.relu(nn.bias_add(_conv2d(h_pool1, w_conv2), b_conv2))
  h_pool2 = _max_pool_2x2(h_conv2)
  return h_pool2

 def _apply_variational_bias(self, inputs):
   if self.bias.posterior is None:
     self.bias.posterior_tensor = None
     return inputs
   self.bias.posterior_tensor = self.bias.posterior_tensor_fn(
       self.bias.posterior)
   return nn.bias_add(inputs, self.bias.posterior_tensor)

  def call(self, inputs):
    if self.data_format == 'channels_first':
      # Reshape to channels last
      inputs = array_ops.transpose(inputs, (0, 2, 3, 1))

    # Apply the actual ops.
    outputs = nn.separable_conv2d(
        inputs,
        self.depthwise_kernel,
        self.pointwise_kernel,
        strides=(1,) + self.strides + (1,),
        padding=self.padding.upper(),
        rate=self.dilation_rate)

    if self.data_format == 'channels_first':
      # Reshape to channels first
      outputs = array_ops.transpose(outputs, (0, 3, 1, 2))

    if self.bias:
      outputs = nn.bias_add(
          outputs,
          self.bias,
          data_format=utils.convert_data_format(self.data_format, ndim=4))

    if self.activation is not None:
      return self.activation(outputs)
    return outputs

 def GetParams(self):
   """Single vgg layer test in TF-TRT conversion."""
   dtype = dtypes.float32
   input_name = "input"
   input_dims = [5, 8, 8, 2]
   output_name = "output"
   g = ops.Graph()
   with g.as_default():
     x = array_ops.placeholder(dtype=dtype, shape=input_dims, name=input_name)
     x, _, _ = nn_impl.fused_batch_norm(
         x, [1.0, 1.0], [0.0, 0.0],
         mean=[0.5, 0.5],
         variance=[1.0, 1.0],
         is_training=False)
     e = constant_op.constant(
         np.random.randn(1, 1, 2, 6), name="weights", dtype=dtype)
     conv = nn.conv2d(
         input=x, filter=e, strides=[1, 2, 2, 1], padding="SAME", name="conv")
     b = constant_op.constant(np.random.randn(6), name="bias", dtype=dtype)
     t = nn.bias_add(conv, b, name="biasAdd")
     relu = nn.relu(t, "relu")
     idty = array_ops.identity(relu, "ID")
     v = nn_ops.max_pool(
         idty, [1, 2, 2, 1], [1, 2, 2, 1], "VALID", name="max_pool")
     array_ops.squeeze(v, name=output_name)
   return trt_test.TfTrtIntegrationTestParams(
       gdef=g.as_graph_def(),
       input_names=[input_name],
       input_dims=[input_dims],
       output_names=[output_name],
       expected_output_dims=[(5, 2, 2, 6)])

  def _testConvReparameterization(self, layer_class):
    batch_size, depth, height, width, channels, filters = 2, 4, 4, 4, 3, 5
    with self.test_session() as sess:
      (kernel_posterior, kernel_prior, kernel_divergence,
       bias_posterior, bias_prior, bias_divergence, layer, inputs,
       outputs, kl_penalty, kernel_shape) = self._testConvSetUp(
           layer_class, batch_size,
           depth=depth, height=height, width=width, channels=channels,
           filters=filters)

      convolution_op = nn_ops.Convolution(
          tensor_shape.TensorShape(inputs.shape),
          filter_shape=tensor_shape.TensorShape(kernel_shape),
          padding="SAME")
      expected_outputs = convolution_op(inputs, kernel_posterior.result_sample)
      expected_outputs = nn.bias_add(expected_outputs,
                                     bias_posterior.result_sample,
                                     data_format="NHWC")

      [
          expected_outputs_, actual_outputs_,
          expected_kernel_, actual_kernel_,
          expected_kernel_divergence_, actual_kernel_divergence_,
          expected_bias_, actual_bias_,
          expected_bias_divergence_, actual_bias_divergence_,
      ] = sess.run([
          expected_outputs, outputs,
          kernel_posterior.result_sample, layer.kernel_posterior_tensor,
          kernel_divergence.result, kl_penalty[0],
          bias_posterior.result_sample, layer.bias_posterior_tensor,
          bias_divergence.result, kl_penalty[1],
      ])

      self.assertAllClose(
          expected_kernel_, actual_kernel_,
          rtol=1e-6, atol=0.)
      self.assertAllClose(
          expected_bias_, actual_bias_,
          rtol=1e-6, atol=0.)
      self.assertAllClose(
          expected_outputs_, actual_outputs_,
          rtol=1e-6, atol=0.)
      self.assertAllClose(
          expected_kernel_divergence_, actual_kernel_divergence_,
          rtol=1e-6, atol=0.)
      self.assertAllClose(
          expected_bias_divergence_, actual_bias_divergence_,
          rtol=1e-6, atol=0.)

      self.assertAllEqual(
          [[kernel_posterior.distribution,
            kernel_prior.distribution,
            kernel_posterior.result_sample]],
          kernel_divergence.args)

      self.assertAllEqual(
          [[bias_posterior.distribution,
            bias_prior.distribution,
            bias_posterior.result_sample]],
          bias_divergence.args)

    def _DenseLayer(x, num_inputs, num_outputs, quantization_range, name):
      """Dense layer with quantized outputs.

      Args:
        x: input to the dense layer
        num_inputs: number of input columns of x
        num_outputs: number of output columns
        quantization_range: the min/max range for quantization
        name: name of the variable scope

      Returns:
        The output of the layer.
      """
      with variable_scope.variable_scope(name):
        kernel = variable_scope.get_variable(
            'kernel',
            shape=[num_inputs, num_outputs],
            dtype=dtypes.float32,
            initializer=keras.initializers.glorot_uniform())
        bias = variable_scope.get_variable(
            'bias',
            shape=[num_outputs],
            dtype=dtypes.float32,
            initializer=keras.initializers.zeros())
        x = math_ops.matmul(x, kernel)
        x = _Quantize(x, quantization_range)
        x = nn.bias_add(x, bias)
        x = _Quantize(x, quantization_range)
      return x

 def get_simple_graph_def(self):
   """Create a simple graph and return its graph_def."""
   g = ops.Graph()
   with g.as_default():
     a = aops.placeholder(
         dtype=dtypes.float32, shape=(None, 24, 24, 2), name="input")
     e = cop.constant(
         [[[[1., 0.5, 4., 6., 0.5, 1.], [1., 0.5, 1., 1., 0.5, 1.]]]],
         name="weights",
         dtype=dtypes.float32)
     conv = nn.conv2d(
         input=a,
         filter=e,
         strides=[1, 2, 2, 1],
         padding="SAME",
         name="conv")
     b = cop.constant(
         [4., 1.5, 2., 3., 5., 7.], name="bias", dtype=dtypes.float32)
     t = nn.bias_add(conv, b, name="biasAdd")
     relu = nn.relu(t, "relu")
     idty = aops.identity(relu, "ID")
     v = nn_ops.max_pool(
         idty, [1, 2, 2, 1], [1, 2, 2, 1], "VALID", name="max_pool")
     aops.squeeze(v, name="output")
   return g.as_graph_def()

def GetSingleEngineGraphDef(dtype=dtypes.float32):
  """Create a graph containing single segment."""
  g = ops.Graph()
  with g.as_default():
    inp = array_ops.placeholder(
        dtype=dtype, shape=[None] + INPUT_DIMS[1:], name=INPUT_NAME)
    with g.device("/GPU:0"):
      conv_filter = constant_op.constant(
          [[[[1., 0.5, 4., 6., 0.5, 1.], [1., 0.5, 1., 1., 0.5, 1.]]]],
          name="weights",
          dtype=dtype)
      conv = nn.conv2d(
          input=inp,
          filter=conv_filter,
          strides=[1, 2, 2, 1],
          padding="SAME",
          name="conv")
      bias = constant_op.constant(
          [4., 1.5, 2., 3., 5., 7.], name="bias", dtype=dtype)
      added = nn.bias_add(conv, bias, name="bias_add")
      relu = nn.relu(added, "relu")
      identity = array_ops.identity(relu, "identity")
      pool = nn_ops.max_pool(
          identity, [1, 2, 2, 1], [1, 2, 2, 1], "VALID", name="max_pool")
    array_ops.squeeze(pool, name=OUTPUT_NAME)
  return g.as_graph_def()

  def GetParams(self):
    # TODO(laigd): we should test the following cases:
    # - batch size is not changed, other dims are changing
    # - batch size is decreasing, other dims are identical
    # - batch size is decreasing, other dims are changing
    # - batch size is increasing, other dims are identical
    # - batch size is increasing, other dims are changing
    input_dims = [[[1, 5, 5, 1]], [[10, 5, 5, 1]], [[3, 5, 5, 1]],
                  [[1, 5, 5, 1]], [[1, 3, 1, 1]], [[2, 9, 9, 1]],
                  [[1, 224, 224, 1]], [[1, 128, 224, 1]]]
    expected_output_dims = input_dims

    g = ops.Graph()
    with g.as_default():
      x = array_ops.placeholder(
          shape=(None, None, None, 1), dtype=dtypes.float32, name="input")
      conv_filter1 = constant_op.constant(
          np.ones([3, 3, 1, 8]), name="weights1", dtype=dtypes.float32)
      bias1 = constant_op.constant(np.random.randn(8), dtype=dtypes.float32)
      x = nn.conv2d(
          input=x,
          filter=conv_filter1,
          strides=[1, 1, 1, 1],
          padding="SAME",
          name="conv")
      x = nn.bias_add(x, bias1)
      x = nn.relu(x)
      conv_filter2 = constant_op.constant(
          np.ones([3, 3, 8, 1]), name="weights2", dtype=dtypes.float32)
      bias2 = constant_op.constant(np.random.randn(1), dtype=dtypes.float32)
      x = nn.conv2d(
          input=x,
          filter=conv_filter2,
          strides=[1, 1, 1, 1],
          padding="SAME",
          name="conv")
      x = nn.bias_add(x, bias2)
      x = array_ops.identity(x, name="output")

    return trt_test.TfTrtIntegrationTestParams(
        gdef=g.as_graph_def(),
        input_names=["input"],
        input_dims=input_dims,
        output_names=["output"],
        expected_output_dims=expected_output_dims)

def _lstm_cell(prev_c, prev_h, x):
  """Create an LSTM cell."""
  # i: input gate
  # f: forget gate
  # o: output gate
  # c: cell state
  # x: input
  # h: embedding
  bias = _bias([4])
  w = _weight([8, 16])
  ifoc = math_ops.matmul(array_ops.concat([x, prev_h], axis=1), w)
  i, f, o, c = array_ops.split(ifoc, 4, axis=1)
  i = math_ops.sigmoid(nn.bias_add(i, bias))
  f = math_ops.sigmoid(nn.bias_add(f, bias))
  o = math_ops.sigmoid(nn.bias_add(o, bias))
  c = math_ops.tanh(nn.bias_add(c, bias))
  next_c = f * prev_c + i * c
  next_h = o * math_ops.tanh(next_c)
  return next_c, next_h

 def loop_fn(i):
   with g:
     a = array_ops.gather(x, i) if stacked_value else x
     b = array_ops.gather(bias, i) if stacked_bias else bias
     y = nn.bias_add(a, b, data_format=data_format)
     loss = math_ops.reduce_sum(y * y)
   grad = g.gradient(loss, bias)
   if stacked_bias:
     # If we gather over bias in loop_fn, the gradient will be an
     # instance of `IndexedSlices` with attrs `values` and `indices`.
     return y, grad.values, grad.indices
   else:
     return y, grad

  def _predictions(self, logits):
    """Returns a dict of predictions.

    Args:
      logits: logits `Tensor` before applying possible centered bias.

    Returns:
      Dict of prediction `Tensor` keyed by `PredictionKey`.
    """
    if self._enable_centered_bias:
      logits = nn.bias_add(logits, _centered_bias(
          self.logits_dimension,
          self._centered_bias_weight_collection))
    return self._logits_to_predictions(logits)

def bias_add(inputs,
             activation_fn=None,
             initializer=init_ops.zeros_initializer,
             regularizer=None,
             reuse=None,
             variables_collections=None,
             outputs_collections=None,
             trainable=True,
             scope=None):
  """Adds a bias to the inputs.

  Can be used as a normalizer function for conv2d and fully_connected.

  Args:
    inputs: a tensor of with at least rank 2 and value for the last dimension,
      e.g. `[batch_size, depth]`, `[None, None, None, depth]`.
    activation_fn: Optional activation function.
    initializer: An initializer for the bias, defaults to 0.
    regularizer: A regularizer like the result of
      `l1_regularizer` or `l2_regularizer`.
    reuse: whether or not the layer and its variables should be reused. To be
      able to reuse the layer scope must be given.
    variables_collections: optional collections for the variables.
    outputs_collections: collections to add the outputs.
    trainable: If `True` also add variables to the graph collection
      `GraphKeys.TRAINABLE_VARIABLES` (see tf.Variable).
    scope: Optional scope for variable_op_scope.

  Returns:
    a tensor representing the result of adding biases to the inputs.
  """
  with variable_scope.variable_op_scope([inputs],
                                        scope, 'BiasAdd', reuse=reuse) as sc:
    inputs = ops.convert_to_tensor(inputs)
    dtype = inputs.dtype.base_dtype
    num_features = utils.last_dimension(inputs.get_shape(), min_rank=2)
    biases_collections = utils.get_variable_collections(variables_collections,
                                                        'biases')
    biases = variables.model_variable('biases',
                                      shape=[num_features,],
                                      dtype=dtype,
                                      initializer=initializer,
                                      regularizer=regularizer,
                                      collections=biases_collections,
                                      trainable=trainable)
    outputs = nn.bias_add(inputs, biases)
    if activation_fn:
      outputs = activation_fn(outputs)
    return utils.collect_named_outputs(outputs_collections, sc.name, outputs)

  def _eval_op(self, features, target, logits=None, logits_input=None,
               name="eval_op"):
    target = _check_target(target, self._label_name)
    if self._enable_centered_bias:
      logits = nn.bias_add(logits, _centered_bias(
          self.logits_dimension,
          self._centered_bias_weight_collection))
    loss_unweighted = self._eval_loss_fn(logits, target)
    loss, _ = _loss(loss_unweighted,
                    _weight_tensor(features, self._weight_column_name),
                    name=name)

    predictions = self._logits_to_prediction(logits)

    return predictions, loss