Module: tf.data.experimental

大牛时代配资Experimental API for building input pipelines.

This module contains experimental Dataset sources and transformations that can be used in conjunction with the tf.data.Dataset API. Note that the tf.data.experimental API is not subject to the same backwards compatibility guarantees as tf.data大牛时代配资, but we will provide deprecation advice in advance of removing existing functionality.

大牛时代配资See for an overview.

Classes

class CheckpointInputPipelineHook大牛时代配资: Checkpoints input pipeline state every N steps or seconds.

class CsvDataset: A Dataset comprising lines from one or more CSV files.

class DistributeOptions大牛时代配资: Represents options for distributed data processing.

class MapVectorizationOptions: Represents options for the MapVectorization optimization.

class OptimizationOptions: Represents options for dataset optimizations.

class Optional: Wraps a value that may/may not be present at runtime.

class RandomDataset: A Dataset of pseudorandom values.

class Reducer大牛时代配资: A reducer is used for reducing a set of elements.

class SqlDataset: A Dataset consisting of the results from a SQL query.

class StatsAggregator大牛时代配资: A stateful resource that aggregates statistics from one or more iterators.

class StatsOptions: Represents options for collecting dataset stats using StatsAggregator.

class TFRecordWriter: Writes data to a TFRecord file.

class ThreadingOptions大牛时代配资: Represents options for dataset threading.

Functions

Counter(...): Creates a Dataset that counts from start in steps of size step.

bucket_by_sequence_length(...): A transformation that buckets elements in a Dataset by length.

bytes_produced_stats(...): Records the number of bytes produced by each element of the input dataset.

cardinality(...): Returns the cardinality of dataset, if known.

choose_from_datasets(...): Creates a dataset that deterministically chooses elements from datasets.

copy_to_device(...): A transformation that copies dataset elements to the given target_device.

dense_to_sparse_batch(...): A transformation that batches ragged elements into tf.SparseTensors.

enumerate_dataset(...): A transformation that enumerates the elements of a dataset. (deprecated)

from_variant(...): Constructs a dataset from the given variant and structure.

get_next_as_optional(...): Returns an Optional大牛时代配资 that contains the next value from the iterator.

get_single_element(...): Returns the single element in dataset大牛时代配资 as a nested structure of tensors.

get_structure(...): Returns the type specification of an element of a Dataset or Iterator.

group_by_reducer(...): A transformation that groups elements and performs a reduction.

group_by_window(...): A transformation that groups windows of elements by key and reduces them.

ignore_errors(...): Creates a Dataset from another Dataset and silently ignores any errors.

latency_stats(...)大牛时代配资: Records the latency of producing each element of the input dataset.

make_batched_features_dataset(...)

make_csv_dataset(...): Reads CSV files into a dataset.

make_saveable_from_iterator(...)大牛时代配资: Returns a SaveableObject for saving/restoring iterator state using Saver.

map_and_batch(...): Fused implementation of map and batch大牛时代配资. (deprecated)

parallel_interleave(...): A parallel version of the Dataset.interleave() transformation. (deprecated)

parse_example_dataset(...): A transformation that parses Example protos into a dict大牛时代配资 of tensors.

prefetch_to_device(...): A transformation that prefetches dataset values to the given device.

rejection_resample(...): A transformation that resamples a dataset to achieve a target distribution.

sample_from_datasets(...): Samples elements at random from the datasets in datasets.

scan(...): A transformation that scans a function across an input dataset.

shuffle_and_repeat(...)大牛时代配资: Shuffles and repeats a Dataset returning a new permutation for each epoch. (deprecated)

take_while(...): A transformation that stops dataset iteration based on a predicate.

to_variant(...): Returns a variant representing the given dataset.

unbatch(...)大牛时代配资: Splits elements of a dataset into multiple elements on the batch dimension. (deprecated)

unique(...): Creates a Dataset from another Dataset, discarding duplicates.

Other Members

  • AUTOTUNE = -1
  • INFINITE_CARDINALITY = -1
  • UNKNOWN_CARDINALITY = -2

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