tensorflow_probability/python/mcmc/internal/util.py
def maybe_call_fn_and_grads(fn,
                            fn_arg_list,
                            result=None,
                            grads=None,
                            check_non_none_grads=True,
                            name=None):
  """Calls `fn` and computes the gradient of the result wrt `args_list`."""
  with tf.compat.v1.name_scope(name, 'maybe_call_fn_and_grads',
                               [fn_arg_list, result, grads]):
    fn_arg_list = (list(fn_arg_list) if is_list_like(fn_arg_list)
                   else [fn_arg_list])
    result, grads = _value_and_gradients(fn, fn_arg_list, result, grads)
    if not all(r.dtype.is_floating
               for r in (result if is_list_like(result) else [result])):  # pylint: disable=superfluous-parens
      raise TypeError('Function result must be a `Tensor` with `float` '
                      '`dtype`.')
    if len(fn_arg_list) != len(grads):
      raise ValueError('Function args must be in one-to-one correspondence '
                       'with grads.')
    if check_non_none_grads and any(g is None for g in grads):
      raise ValueError('Encountered `None` gradient.\n'
                       '  fn_arg_list: {}\n'
                       '  grads: {}'.format(fn_arg_list, grads))
    return result, grads
def maybe_call_fn_and_grads(fn,
                            fn_arg_list,
                            result=None,
                            grads=None,
                            check_non_none_grads=True,
                            name=None):
  with tf.compat.v1.name_scope(name, 'maybe_call_fn_and_grads',
                               [fn_arg_list, result, grads]):
    fn_arg_list = (list(fn_arg_list) if is_list_like(fn_arg_list)
                   else [fn_arg_list])
    result, grads = _value_and_gradients(fn, fn_arg_list, result, grads)
    if not all(r.dtype.is_floating
               for r in (result if is_list_like(result) else [result])):  # pylint: disable=superfluous-parens
      raise TypeError('Function result must be a `Tensor` with `float` '
                      '`dtype`.')
    if len(fn_arg_list) != len(grads):
      raise ValueError('Function args must be in one-to-one correspondence '
                       'with grads.')
    if check_non_none_grads and any(g is None for g in grads):
      raise ValueError('Encountered `None` gradient.\n'
                       '  fn_arg_list: {}\n'
                       '  grads: {}'.format(fn_arg_list, grads))
    return result, grads
def maybe_call_fn_and_grads ( fn , fn_arg_list , result = None , grads = None , check_non_none_grads = True , name = None ) : with tf . compat . v1 . name_scope ( name , 'maybe_call_fn_and_grads' , [ fn_arg_list , result , grads ] ) : fn_arg_list = ( list ( fn_arg_list ) if is_list_like ( fn_arg_list ) else [ fn_arg_list ] ) result , grads = _value_and_gradients ( fn , fn_arg_list , result , grads ) if not all ( r . dtype . is_floating for r in ( result if is_list_like ( result ) else [ result ] ) ) : # pylint: disable=superfluous-parens raise TypeError ( 'Function result must be a `Tensor` with `float` ' '`dtype`.' ) if len ( fn_arg_list ) != len ( grads ) : raise ValueError ( 'Function args must be in one-to-one correspondence ' 'with grads.' ) if check_non_none_grads and any ( g is None for g in grads ) : raise ValueError ( 'Encountered `None` gradient.\n' '  fn_arg_list: {}\n' '  grads: {}' . format ( fn_arg_list , grads ) ) return result , grads
Calls `fn` and computes the gradient of the result wrt `args_list`.
Calls fn and computes the gradient of the result wrt args_list .