Python framework.is_tensor函数代码示例

def _get_input_fn(x, y, input_fn, feed_fn, batch_size, shuffle=False, epochs=1):
  """Make inputs into input and feed functions."""
  if input_fn is None:
    if x is None:
      raise ValueError('Either x or input_fn must be provided.')

    if contrib_framework.is_tensor(x) or (y is not None and
                                          contrib_framework.is_tensor(y)):
      raise ValueError('Inputs cannot be tensors. Please provide input_fn.')

    if feed_fn is not None:
      raise ValueError('Can not provide both feed_fn and x or y.')

    df = data_feeder.setup_train_data_feeder(x, y, n_classes=None,
                                             batch_size=batch_size,
                                             shuffle=shuffle,
                                             epochs=epochs)
    return df.input_builder, df.get_feed_dict_fn()

  if (x is not None) or (y is not None):
    raise ValueError('Can not provide both input_fn and x or y.')
  if batch_size is not None:
    raise ValueError('Can not provide both input_fn and batch_size.')

  return input_fn, feed_fn

  def __init__(self,
               dtype,
               graph_parents=None,
               is_non_singular=None,
               is_self_adjoint=None,
               is_positive_definite=None,
               name=None):
    r"""Initialize the `LinearOperator`.

    **This is a private method for subclass use.**
    **Subclasses should copy-paste this `__init__` documentation.**

    Args:
      dtype: The type of the this `LinearOperator`.  Arguments to `apply` and
        `solve` will have to be this type.
      graph_parents: Python list of graph prerequisites of this `LinearOperator`
        Typically tensors that are passed during initialization.
      is_non_singular:  Expect that this operator is non-singular.
      is_self_adjoint:  Expect that this operator is equal to its hermitian
        transpose.  If `dtype` is real, this is equivalent to being symmetric.
      is_positive_definite:  Expect that this operator is positive definite,
        meaning the real part of all eigenvalues is positive.  We do not require
        the operator to be self-adjoint to be positive-definite.  See:
        https://en.wikipedia.org/wiki/Positive-definite_matrix\
            #Extension_for_non_symmetric_matrices
      name: A name for this `LinearOperator`.

    Raises:
      ValueError: if any member of graph_parents is `None` or not a `Tensor`.
    """
    # Check and auto-set flags.
    if is_positive_definite:
      if is_non_singular is False:
        raise ValueError("A positive definite matrix is always non-singular.")
      is_non_singular = True

    graph_parents = [] if graph_parents is None else graph_parents
    for i, t in enumerate(graph_parents):
      if t is None or not contrib_framework.is_tensor(t):
        raise ValueError("Graph parent item %d is not a Tensor; %s." % (i, t))
    self._dtype = dtype
    self._graph_parents = graph_parents
    self._is_non_singular = is_non_singular
    self._is_self_adjoint = is_self_adjoint
    self._is_positive_definite = is_positive_definite
    self._name = name or type(self).__name__

    # We will cache some tensors to avoid repeatedly adding shape
    # manipulation ops to the graph.
    # Naming convention:
    #   self._cached_X_tensor is the cached version of self._X_tensor.
    self._cached_shape_tensor = None
    self._cached_batch_shape_tensor = None
    self._cached_domain_dimension_tensor = None
    self._cached_range_dimension_tensor = None
    self._cached_tensor_rank_tensor = None

def _get_input_fn(x, y, input_fn, feed_fn, batch_size, shuffle=False, epochs=1):
  """Make inputs into input and feed functions.

  Args:
    x: Numpy, Pandas or Dask matrix or iterable.
    y: Numpy, Pandas or Dask matrix or iterable.
    input_fn: Pre-defined input function for training data.
    feed_fn: Pre-defined data feeder function.
    batch_size: Size to split data into parts. Must be >= 1.
    shuffle: Whether to shuffle the inputs.
    epochs: Number of epochs to run.

  Returns:
    Data input and feeder function based on training data.

  Raises:
    ValueError: Only one of `(x & y)` or `input_fn` must be provided.
  """
  if input_fn is None:
    if x is None:
      raise ValueError('Either x or input_fn must be provided.')

    if contrib_framework.is_tensor(x) or (y is not None and
                                          contrib_framework.is_tensor(y)):
      raise ValueError('Inputs cannot be tensors. Please provide input_fn.')

    if feed_fn is not None:
      raise ValueError('Can not provide both feed_fn and x or y.')

    df = data_feeder.setup_train_data_feeder(x, y, n_classes=None,
                                             batch_size=batch_size,
                                             shuffle=shuffle,
                                             epochs=epochs)
    return df.input_builder, df.get_feed_dict_fn()

  if (x is not None) or (y is not None):
    raise ValueError('Can not provide both input_fn and x or y.')
  if batch_size is not None:
    raise ValueError('Can not provide both input_fn and batch_size.')

  return input_fn, feed_fn

  def __init__(self,
               dtype,
               is_continuous,
               reparameterization_type,
               validate_args,
               allow_nan_stats,
               parameters=None,
               graph_parents=None,
               name=None):
    """Constructs the `Distribution`.

    **This is a private method for subclass use.**

    Args:
      dtype: The type of the event samples. `None` implies no type-enforcement.
      is_continuous: Python `bool`. If `True` this `Distribution` is continuous
        over its supported domain.
      reparameterization_type: Instance of `ReparameterizationType`.
        If `distributions.FULLY_REPARAMETERIZED`, this
        `Distribution` can be reparameterized in terms of some standard
        distribution with a function whose Jacobian is constant for the support
        of the standard distribution. If `distributions.NOT_REPARAMETERIZED`,
        then no such reparameterization is available.
      validate_args: Python `bool`, default `False`. When `True` distribution
        parameters are checked for validity despite possibly degrading runtime
        performance. When `False` invalid inputs may silently render incorrect
        outputs.
      allow_nan_stats: Python `bool`, default `True`. When `True`, statistics
        (e.g., mean, mode, variance) use the value "`NaN`" to indicate the
        result is undefined. When `False`, an exception is raised if one or
        more of the statistic's batch members are undefined.
      parameters: Python `dict` of parameters used to instantiate this
        `Distribution`.
      graph_parents: Python `list` of graph prerequisites of this
        `Distribution`.
      name: Python `str` name prefixed to Ops created by this class. Default:
        subclass name.

    Raises:
      ValueError: if any member of graph_parents is `None` or not a `Tensor`.
    """
    graph_parents = [] if graph_parents is None else graph_parents
    for i, t in enumerate(graph_parents):
      if t is None or not contrib_framework.is_tensor(t):
        raise ValueError("Graph parent item %d is not a Tensor; %s." % (i, t))
    self._dtype = dtype
    self._is_continuous = is_continuous
    self._reparameterization_type = reparameterization_type
    self._allow_nan_stats = allow_nan_stats
    self._validate_args = validate_args
    self._parameters = parameters or {}
    self._graph_parents = graph_parents
    self._name = name or type(self).__name__

  def __init__(self,
               dtype,
               graph_parents=None,
               is_non_singular=None,
               is_self_adjoint=None,
               is_positive_definite=None,
               name=None):
    """Initialize the `LinearOperator`.

    **This is a private method for subclass use.**
    **Subclasses should copy-paste this `__init__` documentation.**

    For `X = non_singular, self_adjoint` etc...
    `is_X` is a Python `bool` initialization argument with the following meaning
    * If `is_X == True`, callers should expect the operator to have the
      attribute `X`.  This is a promise that should be fulfilled, but is *not* a
      runtime assert.  Issues, such as floating point error, could mean the
      operator violates this promise.
    * If `is_X == False`, callers should expect the operator to not have `X`.
    * If `is_X == None` (the default), callers should have no expectation either
      way.

    Args:
      dtype: The type of the this `LinearOperator`.  Arguments to `apply` and
        `solve` will have to be this type.
      graph_parents: Python list of graph prerequisites of this `LinearOperator`
        Typically tensors that are passed during initialization.
      is_non_singular:  Expect that this operator is non-singular.
      is_self_adjoint:  Expect that this operator is equal to its hermitian
        transpose.  If `dtype` is real, this is equivalent to being symmetric.
      is_positive_definite:  Expect that this operator is positive definite.
      name: A name for this `LinearOperator`. Default: subclass name.

    Raises:
      ValueError: if any member of graph_parents is `None` or not a `Tensor`.
    """
    if is_positive_definite and not is_self_adjoint:
      raise ValueError(
          "A positive definite matrix is by definition self adjoint")
    if is_positive_definite and not is_non_singular:
      raise ValueError(
          "A positive definite matrix is by definition non-singular")

    graph_parents = [] if graph_parents is None else graph_parents
    for i, t in enumerate(graph_parents):
      if t is None or not contrib_framework.is_tensor(t):
        raise ValueError("Graph parent item %d is not a Tensor; %s." % (i, t))
    self._dtype = dtype
    self._graph_parents = graph_parents
    self._is_non_singular = is_non_singular
    self._is_self_adjoint = is_self_adjoint
    self._is_positive_definite = is_positive_definite
    self._name = name or type(self).__name__

  def __init__(self,
               dtype,
               is_continuous,
               reparameterization_type,
               validate_args,
               allow_nan_stats,
               parameters=None,
               graph_parents=None,
               name=None):
    """Constructs the `Distribution`.

    **This is a private method for subclass use.**

    Args:
      dtype: The type of the event samples. `None` implies no type-enforcement.
      is_continuous: Python boolean. If `True` this
        `Distribution` is continuous over its supported domain.
      reparameterization_type: Instance of `ReparameterizationType`.
        If `distributions.FULLY_REPARAMETERIZED`, this
        `Distribution` can be reparameterized in terms of some standard
        distribution with a function whose Jacobian is constant for the support
        of the standard distribution.  If `distributions.NOT_REPARAMETERIZED`,
        then no such reparameterization is available.
      validate_args: Python boolean.  Whether to validate input with asserts.
        If `validate_args` is `False`, and the inputs are invalid,
        correct behavior is not guaranteed.
      allow_nan_stats: Python boolean.  If `False`, raise an
        exception if a statistic (e.g., mean, mode) is undefined for any batch
        member. If True, batch members with valid parameters leading to
        undefined statistics will return `NaN` for this statistic.
      parameters: Python dictionary of parameters used to instantiate this
        `Distribution`.
      graph_parents: Python list of graph prerequisites of this `Distribution`.
      name: A name for this distribution. Default: subclass name.

    Raises:
      ValueError: if any member of graph_parents is `None` or not a `Tensor`.
    """
    graph_parents = [] if graph_parents is None else graph_parents
    for i, t in enumerate(graph_parents):
      if t is None or not contrib_framework.is_tensor(t):
        raise ValueError("Graph parent item %d is not a Tensor; %s." % (i, t))
    parameters = parameters or {}
    self._dtype = dtype
    self._is_continuous = is_continuous
    self._reparameterization_type = reparameterization_type
    self._allow_nan_stats = allow_nan_stats
    self._validate_args = validate_args
    self._parameters = parameters
    self._graph_parents = graph_parents
    self._name = name or type(self).__name__

def common_dtype(args_list, preferred_dtype=None):
  """Returns explict dtype from `args_list` if there is one."""
  dtype = None
  for a in args_list:
    if isinstance(a, (np.ndarray, np.generic)):
      dt = a.dtype.type
    elif contrib_framework.is_tensor(a):
      dt = a.dtype.as_numpy_dtype
    else:
      continue
    if dtype is None:
      dtype = dt
    elif dtype != dt:
      raise TypeError('Found incompatible dtypes, {} and {}.'.format(dtype, dt))
  return preferred_dtype if dtype is None else dtype

 def tril_ids(n):
   """Internal helper to create vector of linear indices into y."""
   # Build the ids statically; chose 512 because it implies 1MiB.
   if not contrib_framework.is_tensor(n) and n <= 512:
     ids = np.arange(n**2, dtype=np.int32)
     rows = (ids / n).astype(np.int32)  # Implicit floor.
     # We need to stop incrementing the index when we encounter
     # upper-triangular elements.  The idea here is to compute the
     # lower-right number of zeros then by "symmetry" subtract this from the
     # total number of zeros, n(n-1)/2.
     # Then we note that: n(n-1)/2 - (n-r)*(n-r-1)/2 = r(2n-r-1)/2
     offset = (rows * (2 * n - rows - 1) / 2).astype(np.int32)
     # We could also zero out when (rows < cols) == (rows < ids-n*rows).
     # mask = (ids <= (n + 1) * rows).astype(np.int32)
   else:
     ids = math_ops.range(n**2)
     rows = math_ops.cast(ids / n, dtype=dtypes.int32)
     offset = math_ops.cast(rows * (2 * n - rows - 1) / 2,
                            dtype=dtypes.int32)
   return ids - offset

def amari_alpha(logu, alpha=1., self_normalized=False, name=None):
  """The Amari-alpha Csiszar-function in log-space.

  A Csiszar-function is a member of,

  ```none
  F = { f:R_+ to R : f convex }.
  ```

  When `self_normalized = True`, the Amari-alpha Csiszar-function is:

  ```none
  f(u) = { -log(u) + (u - 1),     alpha = 0
         { u log(u) - (u - 1),    alpha = 1
         { [(u**alpha - 1) - alpha (u - 1)] / (alpha (alpha - 1)),    otherwise
  ```

  When `self_normalized = False` the `(u - 1)` terms are omitted.

  Warning: when `alpha != 0` and/or `self_normalized = True` this function makes
  non-log-space calculations and may therefore be numerically unstable for
  `|logu| >> 0`.

  For more information, see:
    A. Cichocki and S. Amari. "Families of Alpha-Beta-and GammaDivergences:
    Flexible and Robust Measures of Similarities." Entropy, vol. 12, no. 6, pp.
    1532-1568, 2010.

  Args:
    logu: Floating-type `Tensor` representing `log(u)` from above.
    alpha: Floating-type Python scalar. (See Mathematical Details for meaning.)
    self_normalized: Python `bool` indicating whether `f'(u=1)=0`. When
      `f'(u=1)=0` the implied Csiszar f-Divergence remains non-negative even
      when `p, q` are unnormalized measures.
    name: Python `str` name prefixed to Ops created by this function.

  Returns:
    amari_alpha_of_u: Floating-type `Tensor` of the Csiszar-function evaluated
      at `u = exp(logu)`.

  Raises:
    TypeError: if `alpha` is `None` or a `Tensor`.
    TypeError: if `self_normalized` is `None` or a `Tensor`.
  """
  with ops.name_scope(name, "amari_alpha", [logu]):
    if alpha is None or contrib_framework.is_tensor(alpha):
      raise TypeError("`alpha` cannot be `None` or `Tensor` type.")
    if self_normalized is None or contrib_framework.is_tensor(self_normalized):
      raise TypeError("`self_normalized` cannot be `None` or `Tensor` type.")

    logu = ops.convert_to_tensor(logu, name="logu")

    if alpha == 0.:
      f = -logu
    elif alpha == 1.:
      f = math_ops.exp(logu) * logu
    else:
      f = math_ops.expm1(alpha * logu) / (alpha * (alpha - 1.))

    if not self_normalized:
      return f

    if alpha == 0.:
      return f + math_ops.expm1(logu)
    elif alpha == 1.:
      return f - math_ops.expm1(logu)
    else:
      return f - math_ops.expm1(logu) / (alpha - 1.)

#.........这里部分代码省略.........
    ```

    If none of `scale_identity_multiplier`, `scale_diag`, or `scale_tril` are
    specified then `scale += IdentityMatrix`. Otherwise specifying a
    `scale` argument has the semantics of `scale += Expand(arg)`, i.e.,
    `scale_diag != None` means `scale += tf.diag(scale_diag)`.

    Args:
      shift: Floating-point `Tensor`. If this is set to `None`, no shift is
        applied.
      scale_identity_multiplier: floating point rank 0 `Tensor` representing a
        scaling done to the identity matrix.
        When `scale_identity_multiplier = scale_diag = scale_tril = None` then
        `scale += IdentityMatrix`. Otherwise no scaled-identity-matrix is added
        to `scale`.
      scale_diag: Floating-point `Tensor` representing the diagonal matrix.
        `scale_diag` has shape [N1, N2, ...  k], which represents a k x k
        diagonal matrix.
        When `None` no diagonal term is added to `scale`.
      scale_tril: Floating-point `Tensor` representing the diagonal matrix.
        `scale_diag` has shape [N1, N2, ...  k, k], which represents a k x k
        lower triangular matrix.
        When `None` no `scale_tril` term is added to `scale`.
        The upper triangular elements above the diagonal are ignored.
      scale_perturb_factor: Floating-point `Tensor` representing factor matrix
        with last two dimensions of shape `(k, r)`. When `None`, no rank-r
        update is added to `scale`.
      scale_perturb_diag: Floating-point `Tensor` representing the diagonal
        matrix. `scale_perturb_diag` has shape [N1, N2, ...  r], which
        represents an `r x r` diagonal matrix. When `None` low rank updates will
        take the form `scale_perturb_factor * scale_perturb_factor.T`.
      event_ndims: Scalar `int32` `Tensor` indicating the number of dimensions
        associated with a particular draw from the distribution. Must be 0 or 1.
      validate_args: Python `bool` indicating whether arguments should be
        checked for correctness.
      name: Python `str` name given to ops managed by this object.

    Raises:
      ValueError: if `perturb_diag` is specified but not `perturb_factor`.
      TypeError: if `shift` has different `dtype` from `scale` arguments.
    """
    self._graph_parents = []
    self._name = name
    self._validate_args = validate_args
    # Ambiguous definition of low rank update.
    if scale_perturb_diag is not None and scale_perturb_factor is None:
      raise ValueError("When scale_perturb_diag is specified, "
                       "scale_perturb_factor must be specified.")
    # Special case, only handling a scaled identity matrix. We don't know its
    # dimensions, so this is special cased.
    # We don't check identity_multiplier, since below we set it to 1. if all
    # other scale args are None.
    self._is_only_identity_multiplier = (scale_tril is None and
                                         scale_diag is None and
                                         scale_perturb_factor is None)
    # When no args are specified, pretend the scale matrix is the identity
    # matrix.
    if self._is_only_identity_multiplier and scale_identity_multiplier is None:
      scale_identity_multiplier = 1.
    with self._name_scope("init", values=[
        shift, scale_identity_multiplier, scale_diag, scale_tril,
        scale_perturb_diag, scale_perturb_factor, event_ndims]):
      event_ndims = ops.convert_to_tensor(event_ndims, name="event_ndims")
      if validate_args:
        is_less_than_two = check_ops.assert_less(
            event_ndims, 2,
            message="event_ndims must be 0 or 1")
        event_ndims = control_flow_ops.with_dependencies(
            [is_less_than_two], event_ndims)
      self._shift = _as_tensor(shift, "shift")
      # self._create_scale_operator returns an OperatorPD in all cases except if
      # self._is_only_identity_multiplier; in which case it returns a scalar
      # Tensor.
      self._scale = self._create_scale_operator(
          identity_multiplier=scale_identity_multiplier,
          diag=scale_diag,
          tril=scale_tril,
          perturb_diag=scale_perturb_diag,
          perturb_factor=scale_perturb_factor,
          event_ndims=event_ndims,
          validate_args=validate_args)
      if (self._shift is not None and
          self._shift.dtype.base_dtype != self._scale.dtype.base_dtype):
        raise TypeError("shift.dtype({}) does not match scale.dtype({})".format(
            self._shift.dtype, self._scale.dtype))
      self._shaper = _DistributionShape(
          batch_ndims=self._infer_batch_ndims(),
          event_ndims=event_ndims,
          validate_args=validate_args)
      super(Affine, self).__init__(
          event_ndims=event_ndims,
          graph_parents=(
              [event_ndims] +
              [self._scale] if contrib_framework.is_tensor(self._scale)
              else self._scale.inputs +
              [self._shift] if self._shift is not None else []),
          is_constant_jacobian=True,
          dtype=self._scale.dtype,
          validate_args=validate_args,
          name=name)