Python nn_ops.log_softmax方法代码示例

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _kl_categorical_categorical(a, b, name=None):
  """Calculate the batched KL divergence KL(a || b) with a and b Categorical.

  Args:
    a: instance of a Categorical distribution object.
    b: instance of a Categorical distribution object.
    name: (optional) Name to use for created operations.
      default is "kl_categorical_categorical".

  Returns:
    Batchwise KL(a || b)
  """
  with ops.name_scope(name, "kl_categorical_categorical",
                      values=[a.logits, b.logits]):
    # sum(probs log(probs / (1 - probs)))
    delta_log_probs1 = (nn_ops.log_softmax(a.logits) -
                        nn_ops.log_softmax(b.logits))
    return math_ops.reduce_sum(nn_ops.softmax(a.logits) * delta_log_probs1,
                               axis=-1) 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _kl_categorical_categorical(a, b, name=None):
  """Calculate the batched KL divergence KL(a || b) with a, b OneHotCategorical.

  Args:
    a: instance of a OneHotCategorical distribution object.
    b: instance of a OneHotCategorical distribution object.
    name: (optional) Name to use for created operations.
      default is "kl_categorical_categorical".

  Returns:
    Batchwise KL(a || b)
  """
  with ops.name_scope(name, "kl_categorical_categorical", values=[
      a.logits, b.logits]):
    # sum(p ln(p / q))
    return math_ops.reduce_sum(
        nn_ops.softmax(a.logits) * (nn_ops.log_softmax(a.logits)
                                    - nn_ops.log_softmax(b.logits)),
        axis=-1) 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _sample_n(self, n, seed=None):
    sample_shape = array_ops.concat([[n], array_ops.shape(self.logits)], 0)
    logits = self.logits * array_ops.ones(sample_shape)
    logits_2d = array_ops.reshape(logits, [-1, self.event_size])
    # Uniform variates must be sampled from the open-interval `(0, 1)` rather
    # than `[0, 1)`. To do so, we use `np.finfo(self.dtype.as_numpy_dtype).tiny`
    # because it is the smallest, positive, "normal" number. A "normal" number
    # is such that the mantissa has an implicit leading 1. Normal, positive
    # numbers x, y have the reasonable property that, `x + y >= max(x, y)`. In
    # this case, a subnormal number (i.e., np.nextafter) can cause us to sample
    # 0.
    uniform = random_ops.random_uniform(
        shape=array_ops.shape(logits_2d),
        minval=np.finfo(self.dtype.as_numpy_dtype).tiny,
        maxval=1.,
        dtype=self.dtype,
        seed=seed)
    gumbel = -math_ops.log(-math_ops.log(uniform))
    noisy_logits = math_ops.div(gumbel + logits_2d, self._temperature_2d)
    samples = nn_ops.log_softmax(noisy_logits)
    ret = array_ops.reshape(samples, sample_shape)
    return ret 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _log_prob(self, x):
    x = self._assert_valid_sample(x)
    # broadcast logits or x if need be.
    logits = self.logits
    if (not x.get_shape().is_fully_defined() or
        not logits.get_shape().is_fully_defined() or
        x.get_shape() != logits.get_shape()):
      logits = array_ops.ones_like(x, dtype=logits.dtype) * logits
      x = array_ops.ones_like(logits, dtype=x.dtype) * x
    logits_shape = array_ops.shape(math_ops.reduce_sum(logits, axis=[-1]))
    logits_2d = array_ops.reshape(logits, [-1, self.event_size])
    x_2d = array_ops.reshape(x, [-1, self.event_size])
    # compute the normalization constant
    k = math_ops.cast(self.event_size, x.dtype)
    log_norm_const = (math_ops.lgamma(k)
                      + (k - 1.)
                      * math_ops.log(self.temperature))
    # compute the unnormalized density
    log_softmax = nn_ops.log_softmax(logits_2d - x_2d * self._temperature_2d)
    log_unnorm_prob = math_ops.reduce_sum(log_softmax, [-1], keep_dims=False)
    # combine unnormalized density with normalization constant
    log_prob = log_norm_const + log_unnorm_prob
    # Reshapes log_prob to be consistent with shape of user-supplied logits
    ret = array_ops.reshape(log_prob, logits_shape)
    return ret 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _kl_categorical_categorical(a, b, name=None):
  """Calculate the batched KL divergence KL(a || b) with a, b OneHotCategorical.

  Args:
    a: instance of a OneHotCategorical distribution object.
    b: instance of a OneHotCategorical distribution object.
    name: (optional) Name to use for created operations.
      default is "kl_categorical_categorical".

  Returns:
    Batchwise KL(a || b)
  """
  with ops.name_scope(
      name, "kl_categorical_categorical", [a.logits, b.logits]):
    # sum(p*ln(p/q))
    return math_ops.reduce_sum(
        nn_ops.softmax(a.logits)*(nn_ops.log_softmax(a.logits)
            - nn_ops.log_softmax(b.logits)), reduction_indices=[-1]) 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _forward_log_det_jacobian(self, x):
    if self._static_event_ndims == 0:
      return x - 2. * nn_ops.softplus(x)
    else:
      # This code is similar to nn_ops.log_softmax but different because we have
      # an implicit zero column to handle. I.e., instead of:
      #   reduce_sum(logits - reduce_sum(exp(logits), dim))
      # we must do:
      #   log_normalization = 1 + reduce_sum(exp(logits))
      #   -log_normalization + reduce_sum(logits - log_normalization)
      log_normalization = nn_ops.softplus(
          math_ops.reduce_logsumexp(x, reduction_indices=-1, keep_dims=True))
      fldj = (-log_normalization +
              math_ops.reduce_sum(x - log_normalization,
                                  reduction_indices=-1,
                                  keep_dims=True))
      return array_ops.squeeze(fldj, squeeze_dims=-1) 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _sample_n(self, n, seed=None):
    sample_shape = array_ops.concat(([n], array_ops.shape(self.logits)), 0)
    logits = self.logits * array_ops.ones(sample_shape)
    if logits.get_shape().ndims == 2:
      logits_2d = logits
    else:
      logits_2d = array_ops.reshape(logits, [-1, self.num_classes])
    np_dtype = self.dtype.as_numpy_dtype()
    minval = np.nextafter(np_dtype(0), np_dtype(1))
    uniform = random_ops.random_uniform(shape=array_ops.shape(logits_2d),
                                        minval=minval,
                                        maxval=1,
                                        dtype=self.dtype,
                                        seed=seed)
    gumbel = - math_ops.log(- math_ops.log(uniform))
    noisy_logits = math_ops.div(gumbel + logits_2d, self.temperature)
    samples = nn_ops.log_softmax(noisy_logits)
    ret = array_ops.reshape(samples, sample_shape)
    return ret 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def test_unary_ops(self):
    ops = [
        ('relu', nn_ops.relu, nn.relu),
        ('relu6', nn_ops.relu6, nn.relu6),
        ('crelu', nn_ops.crelu, nn.crelu),
        ('elu', nn_ops.elu, nn.elu),
        ('softplus', nn_ops.softplus, nn.softplus),
        ('l2_loss', nn_ops.l2_loss, nn.l2_loss),
        ('softmax', nn_ops.softmax, nn.softmax),
        ('log_softmax', nn_ops.log_softmax, nn.log_softmax),
    ]
    for op_name, tf_op, lt_op in ops:
      golden_tensor = tf_op(self.original_lt.tensor)
      golden_lt = core.LabeledTensor(golden_tensor, self.axes)
      actual_lt = lt_op(self.original_lt)
      self.assertIn(op_name, actual_lt.name)
      self.assertLabeledTensorsEqual(golden_lt, actual_lt) 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _kl_categorical_categorical(a, b, name=None):
  """Calculate the batched KL divergence KL(a || b) with a and b Categorical.

  Args:
    a: instance of a Categorical distribution object.
    b: instance of a Categorical distribution object.
    name: (optional) Name to use for created operations.
      default is "kl_categorical_categorical".

  Returns:
    Batchwise KL(a || b)
  """
  with ops.name_scope(
    name, "kl_categorical_categorical", [a.logits, b.logits]):
    # sum(p*ln(p/q))
    return math_ops.reduce_sum(
        nn_ops.softmax(a.logits)*(nn_ops.log_softmax(a.logits)
            - nn_ops.log_softmax(b.logits)), reduction_indices=[-1]) 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _entropy(self):
    return -math_ops.reduce_sum(
        nn_ops.log_softmax(self.logits) * self.probs, axis=-1) 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _cat_probs(self, log_probs):
    """Get a list of num_components batchwise probabilities."""
    which_softmax = nn_ops.log_softmax if log_probs else nn_ops.softmax
    cat_probs = which_softmax(self.cat.logits)
    cat_probs = array_ops.unstack(cat_probs, num=self.num_components, axis=-1)
    return cat_probs 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _log_prob(self, x):
    x = ops.convert_to_tensor(x, name="x")
    x = self._assert_valid_sample(x)
    # broadcast logits or x if need be.
    logits = self.logits
    if (not x.get_shape().is_fully_defined() or
        not logits.get_shape().is_fully_defined() or
        x.get_shape() != logits.get_shape()):
      logits = array_ops.ones_like(x, dtype=logits.dtype) * logits
      x = array_ops.ones_like(logits, dtype=x.dtype) * x

    logits_shape = array_ops.shape(logits)
    if logits.get_shape().ndims == 2:
      logits_2d = logits
      x_2d = x
    else:
      logits_2d = array_ops.reshape(logits, [-1, self.num_classes])
      x_2d = array_ops.reshape(x, [-1, self.num_classes])
    # compute the normalization constant
    log_norm_const = (math_ops.lgamma(self.num_classes)
                      + (self.num_classes - 1)
                      * math_ops.log(self.temperature))
    # compute the unnormalized density
    log_softmax = nn_ops.log_softmax(logits_2d - x_2d * self.temperature)
    log_unnorm_prob = math_ops.reduce_sum(log_softmax, [-1], keep_dims=False)
    # combine unnormalized density with normalization constant
    log_prob = log_norm_const + log_unnorm_prob
    ret = array_ops.reshape(log_prob, logits_shape)
    return ret 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _cat_probs(self, log_probs):
    """Get a list of num_components batchwise probabilities."""
    which_softmax = nn_ops.log_softmax if log_probs else nn_ops.softmax
    cat_probs = which_softmax(self.cat.logits)
    cat_probs = array_ops.unpack(
        cat_probs, num=self.num_components, axis=-1)
    return cat_probs 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def step(self, time, inputs, state, name=None):
        """Perform a decoding step.

        Args:
          time: scalar `int32` tensor.
          inputs: A (structure of) input tensors.
          state: A (structure of) state tensors and TensorArrays.
          name: Name scope for any created operations.

        Returns:
          `(outputs, next_state, next_inputs, finished)`.
        """
        with ops.name_scope(name, "BasicCustomDecoderStep", (time, inputs, state)):
            cell_outputs, cell_state = self._cell(inputs, state)
            if self._output_layer is not None:
                cell_outputs = self._output_layer(cell_outputs)

            # Calculate probabilities at each step
            step_log_probs = nn_ops.log_softmax(cell_outputs)

            sample_ids = self._helper.sample(
                time=time, outputs=cell_outputs, state=cell_state)
            (finished, next_inputs, next_state) = self._helper.next_inputs(
                time=time,
                outputs=cell_outputs,
                state=cell_state,
                sample_ids=sample_ids)
        outputs = BasicDecoderOutput(step_log_probs, cell_outputs, sample_ids)
        return (outputs, next_state, next_inputs, finished) 

# 需要导入模块: from tensorflow.python.ops import nn_ops [as 别名]
# 或者: from tensorflow.python.ops.nn_ops import log_softmax [as 别名]
def _test_log_softmax(data, quantized=False):
    """ One iteration of log_softmax """
    with tf.Graph().as_default():
        in_data = array_ops.placeholder(shape=data.shape, dtype='float32', name='in_0')

        if quantized:
            inq_data = tf.quantization.fake_quant_with_min_max_args(in_data, min=-10, max=10, name="inq_0")
            input_range = {'inq_0': (-10, 10)}
            # tflite log_softmax supports only the case when axis is not specified
            out = nn_ops.log_softmax(inq_data)
            out = tf.quantization.fake_quant_with_min_max_args(out, min=-20, max=0, name="out")
            compare_tflite_with_tvm(data, 'inq_0:0', [inq_data], [out], quantized=True, input_range=input_range)
        else:
            out = nn_ops.log_softmax(in_data)
            compare_tflite_with_tvm(data, 'in_0:0', [in_data], [out])