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TensorFlow 2 version View source on GitHub

Returns a Dataset of feature dictionaries from Example protos.

If label_key argument is provided, returns a Dataset of tuple comprising of feature dictionaries and label.


serialized_examples = [
  features {
    feature { key: "age" value { int64_list { value: [ 0 ] } } }
    feature { key: "gender" value { bytes_list { value: [ "f" ] } } }
    feature { key: "kws" value { bytes_list { value: [ "code", "art" ] } } }
  features {
    feature { key: "age" value { int64_list { value: [] } } }
    feature { key: "gender" value { bytes_list { value: [ "f" ] } } }
    feature { key: "kws" value { bytes_list { value: [ "sports" ] } } }

We can use arguments:

features: {
  "age": FixedLenFeature([], dtype=tf.int64, default_value=-1),
  "gender": FixedLenFeature([], dtype=tf.string),
  "kws": VarLenFeature(dtype=tf.string),

And the expected output is:

  "age": [[0], [-1]],
  "gender": [["f"], ["f"]],
  "kws": SparseTensor(
    indices=[[0, 0], [0, 1], [1, 0]],
    values=["code", "art", "sports"]
    dense_shape=[2, 2]),

file_pattern List of files or patterns of file paths containing Example records. See for pattern rules.
batch_size An int representing the number of records to combine in a single batch.
features A dict mapping feature keys to FixedLenFeature or VarLenFeature values. See
reader A function or class that can be called with a filenames tensor and (optional) reader_args and returns a Dataset of Example tensors. Defaults to
label_key (Optional) A string corresponding to the key labels are stored in tf.Examples. If provided, it must be one of the features key, otherwise results in ValueError.
reader_args Additional arguments to pass to the reader class.
num_epochs Integer specifying the number of times to read through the dataset. If None, cycles through the dataset forever. Defaults to None.
shuffle A boolean, indicates whether the input should be shuffled. Defaults to True.
shuffle_buffer_size Buffer size of the ShuffleDataset. A large capacity ensures better shuffling but would increase memory usage and startup time.
shuffle_seed Randomization seed to use for shuffling.
prefetch_buffer_size Number of feature batches to prefetch in order to improve performance. Recommended value is the number of batches consumed per training step. Defaults to auto-tune.
reader_num_threads Number of threads used to read Example records. If >1, the results will be interleaved. Defaults to 1.
parser_num_threads Number of threads to use for parsing Example tensors into a dictionary of Feature tensors. Defaults to 2.
sloppy_ordering If True, reading performance will be improved at the cost of non-deterministic ordering. If False, the order of elements produced is deterministic prior to shuffling (elements are still randomized if shuffle=True. Note that if the seed is set, then order of elements after shuffling is deterministic). Defaults to False.
drop_final_batch If True, and the batch size does not evenly divide the input dataset size, the final smaller batch will be dropped. Defaults to False.

A dataset of dict elements, (or a tuple of dict elements and label). Each dict maps feature keys to Tensor or SparseTensor objects.

TypeError If reader is a tf.compat.v1.ReaderBase subclass.
ValueError If label_key is not one of the features keys.