helper.py 文件源码

def __init__(self, inputs, sequence_length, embedding, sampling_probability,
               time_major=False, seed=None, scheduling_seed=None, name=None):
    """Initializer.

    Args:
      inputs: A (structure of) input tensors.
      sequence_length: An int32 vector tensor.
      embedding: A callable that takes a vector tensor of `ids` (argmax ids),
        or the `params` argument for `embedding_lookup`.
      sampling_probability: A 0D `float32` tensor: the probability of sampling
        categorically from the output ids instead of reading directly from the
        inputs.
      time_major: Python bool.  Whether the tensors in `inputs` are time major.
        If `False` (default), they are assumed to be batch major.
      seed: The sampling seed.
      scheduling_seed: The schedule decision rule sampling seed.
      name: Name scope for any created operations.

    Raises:
      ValueError: if `sampling_probability` is not a scalar or vector.
    """
    with ops.name_scope(name, "ScheduledEmbeddingSamplingWrapper",
                        [embedding, sampling_probability]):
      if callable(embedding):
        self._embedding_fn = embedding
      else:
        self._embedding_fn = (
            lambda ids: embedding_ops.embedding_lookup(embedding, ids))
      self._sampling_probability = ops.convert_to_tensor(
          sampling_probability, name="sampling_probability")
      if self._sampling_probability.get_shape().ndims not in (0, 1):
        raise ValueError(
            "sampling_probability must be either a scalar or a vector. "
            "saw shape: %s" % (self._sampling_probability.get_shape()))
      self._seed = seed
      self._scheduling_seed = scheduling_seed
      super(ScheduledEmbeddingTrainingHelper, self).__init__(
          inputs=inputs,
          sequence_length=sequence_length,
          time_major=time_major,
          name=name)