PyPI 官网下载 | tfds-nightly-1.0.1.dev201903250105.tar.gz

# TensorFlow Datasets TensorFlow Datasets provides many public datasets as `tf.data.Datasets`. [](https://storage.googleapis.com/tfds-kokoro-public/kokoro-build.html) [](https://badge.fury.io/py/tensorflow-datasets) * [List of datasets](https://github.com/tensorflow/datasets/tree/master/docs/datasets.md) * [Try it in Colab](https://colab.research.google.com/github/tensorflow/datasets/blob/master/docs/overview.ipynb) * [API docs](https://www.tensorflow.org/datasets/api_docs/python/tfds) * [Add a dataset](https://github.com/tensorflow/datasets/tree/master/docs/add_dataset.md) **Table of Contents** * [Installation](#installation) * [Usage](#usage) * [`DatasetBuilder`](#datasetbuilder) * [NumPy usage](#numpy-usage-with-tfdsas-numpy) * [Want a certain dataset?](#want-a-certain-dataset) * [Disclaimers](#disclaimers) ### Installation ```sh pip install tensorflow-datasets # Requires TF 1.12+ to be installed. # Some datasets require additional libraries; see setup.py extras_require pip install tensorflow # or: pip install tensorflow-gpu ``` ### Usage ```python import tensorflow_datasets as tfds import tensorflow as tf # tfds works in both Eager and Graph modes tf.enable_eager_execution() # See available datasets print(tfds.list_builders()) # Construct a tf.data.Dataset ds_train, ds_test = tfds.load(name="mnist", split=["train", "test"]) # Build your input pipeline ds_train = ds_train.shuffle(1000).batch(128).prefetch(10) for features in ds_train.take(1): image, label = features["image"], features["label"] ``` Try it interactively in a [Colab notebook](https://colab.research.google.com/github/tensorflow/datasets/blob/master/docs/overview.ipynb). ### `DatasetBuilder` All datasets are implemented as subclasses of [`DatasetBuilder`](https://www.tensorflow.org/datasets/api_docs/python/tfds/core/DatasetBuilder.md) and [`tfds.load`](https://www.tensorflow.org/datasets/api_docs/python/tfds/load.md) is a thin convenience wrapper. [`DatasetInfo`](https://www.tensorflow.org/datasets/api_docs/python/tfds/core/DatasetInfo.md) documents the dataset. ```python import tensorflow_datasets as tfds # The following is the equivalent of the `load` call above. # You can fetch the DatasetBuilder class by string mnist_builder = tfds.builder("mnist") # Download the dataset mnist_builder.download_and_prepare() # Construct a tf.data.Dataset ds = mnist_builder.as_dataset(split=tfds.Split.TRAIN) # Get the `DatasetInfo` object, which contains useful information about the # dataset and its features info = mnist_builder.info print(info) tfds.core.DatasetInfo( name='mnist', version=1.0.0, description='The MNIST database of handwritten digits.', urls=[u'http://yann.lecun.com/exdb/mnist/'], features=FeaturesDict({ 'image': Image(shape=(28, 28, 1), dtype=tf.uint8), 'label': ClassLabel(shape=(), dtype=tf.int64, num_classes=10) }, total_num_examples=70000, splits={ u'test': <tfds.core.SplitInfo num_examples=10000>, u'train': <tfds.core.SplitInfo num_examples=60000> }, supervised_keys=(u'image', u'label'), citation='""" @article{lecun2010mnist, title={MNIST handwritten digit database}, author={LeCun, Yann and Cortes, Corinna and Burges, CJ}, journal={ATT Labs [Online]. Available: http://yann. lecun. com/exdb/mnist}, volume={2}, year={2010} } """', ) ``` ### NumPy Usage with `tfds.as_numpy` As a convenience for users that want simple NumPy arrays in their programs, you can use [`tfds.as_numpy`](https://www.tensorflow.org/datasets/api_docs/python/tfds/as_numpy.md) to return a generator that yields NumPy array records out of a `tf.data.Dataset`. This allows you to build high-performance input pipelines with `tf.data` but use whatever you'd like for your model components. ```python train_ds = tfds.load("mnist", split=tfds.Split.TRAIN) train_ds = train_ds.shuffle(1024).batch(128).repeat(5).prefetch(10) for example in tfds.as_numpy(train_ds): numpy_images, numpy_labels = example["image"], example["label"] ``` You can also use `tfds.as_numpy` in conjunction with `batch_size=-1` to get the full dataset in NumPy arrays from the returned `tf.Tensor` object: ```python train_ds = tfds.load("mnist", split=tfds.Split.TRAIN, batch_size=-1) numpy_ds = tfds.as_numpy(train_ds) numpy_images, numpy_labels = numpy_ds["image"], numpy_ds["label"] ``` Note that the library still requires `tensorflow` as an internal dependency. ## Want a certain dataset? Adding a dataset is really straightforward by following [our guide](https://github.com/tensorflow/datasets/tree/master/docs/add_dataset.md). Request a dataset by opening a [Dataset request GitHub issue](https://github.com/tensorflow/datasets/issues/new?assignees=&labels=dataset+request&template=dataset-request.md&title=%5Bdata+request%5D+%3Cdataset+name%3E). And vote on the current [set of requests](https://github.com/tensorflow/datasets/labels/dataset%20request) by adding a thumbs-up reaction to the issue. #### *Disclaimers* *This is a utility library that downloads and prepares public datasets. We do* *not host or distribute these datasets, vouch for their quality or fairness, or* *claim that you have license to use the dataset. It is your responsibility to* *determine whether you have permission to use the dataset under the dataset's* *license.* *If you're a dataset owner and wish to update any part of it (description,* *citation, etc.), or do not want your dataset to be included in this* *library, please get in touch through a GitHub issue. Thanks for your* *contribution to the ML community!* *If you're interested in learning more about responsible AI practices, including* *fairness, please see Google AI's [Responsible AI Practices](https://ai.google/education/responsible-ai-practices).* *`tensorflow/datasets` is Apache 2.0 licensed. See the `LICENSE` file.*