def build_input_pipeline(data_dir, batch_size, heldout_size, mnist_type):
  """Builds an Iterator switching between train and heldout data."""
  # Build an iterator over training batches.
  if mnist_type in [MnistType.FAKE_DATA, MnistType.THRESHOLD]:
    if mnist_type == MnistType.FAKE_DATA:
      mnist_data = build_fake_data()
    else:
      mnist_data = mnist.read_data_sets(data_dir)
    training_dataset = tf.data.Dataset.from_tensor_slices(
        (mnist_data.train.images, np.int32(mnist_data.train.labels)))
    heldout_dataset = tf.data.Dataset.from_tensor_slices(
        (mnist_data.validation.images,
         np.int32(mnist_data.validation.labels)))
  elif mnist_type == MnistType.BERNOULLI:
    training_dataset = load_bernoulli_mnist_dataset(data_dir, "train")
    heldout_dataset = load_bernoulli_mnist_dataset(data_dir, "valid")
  else:
    raise ValueError("Unknown MNIST type.")

  training_batches = training_dataset.repeat().batch(batch_size)
  training_iterator = tf.compat.v1.data.make_one_shot_iterator(training_batches)

  # Build a iterator over the heldout set with batch_size=heldout_size,
  # i.e., return the entire heldout set as a constant.
  heldout_frozen = (heldout_dataset.take(heldout_size).
                    repeat().batch(heldout_size))
  heldout_iterator = tf.compat.v1.data.make_one_shot_iterator(heldout_frozen)

  # Combine these into a feedable iterator that can switch between training
  # and validation inputs.
  handle = tf.compat.v1.placeholder(tf.string, shape=[])
  feedable_iterator = tf.compat.v1.data.Iterator.from_string_handle(
      handle, training_batches.output_types, training_batches.output_shapes)
  images, labels = feedable_iterator.get_next()
  # Reshape as a pixel image and binarize pixels.
  images = tf.reshape(images, shape=[-1] + IMAGE_SHAPE)
  if mnist_type in [MnistType.FAKE_DATA, MnistType.THRESHOLD]:
    images = tf.cast(images > 0.5, dtype=tf.int32)

  return images, labels, handle, training_iterator, heldout_iterator
def build_input_pipeline(data_dir, batch_size, heldout_size, mnist_type):
  
  
  if mnist_type in [MnistType.FAKE_DATA, MnistType.THRESHOLD]:
    if mnist_type == MnistType.FAKE_DATA:
      mnist_data = build_fake_data()
    else:
      mnist_data = mnist.read_data_sets(data_dir)
    training_dataset = tf.data.Dataset.from_tensor_slices(
        (mnist_data.train.images, np.int32(mnist_data.train.labels)))
    heldout_dataset = tf.data.Dataset.from_tensor_slices(
        (mnist_data.validation.images,
         np.int32(mnist_data.validation.labels)))
  elif mnist_type == MnistType.BERNOULLI:
    training_dataset = load_bernoulli_mnist_dataset(data_dir, "train")
    heldout_dataset = load_bernoulli_mnist_dataset(data_dir, "valid")
  else:
    raise ValueError("Unknown MNIST type.")

  training_batches = training_dataset.repeat().batch(batch_size)
  training_iterator = tf.compat.v1.data.make_one_shot_iterator(training_batches)

  
  
  heldout_frozen = (heldout_dataset.take(heldout_size).
                    repeat().batch(heldout_size))
  heldout_iterator = tf.compat.v1.data.make_one_shot_iterator(heldout_frozen)

  
  
  handle = tf.compat.v1.placeholder(tf.string, shape=[])
  feedable_iterator = tf.compat.v1.data.Iterator.from_string_handle(
      handle, training_batches.output_types, training_batches.output_shapes)
  images, labels = feedable_iterator.get_next()
  
  images = tf.reshape(images, shape=[-1] + IMAGE_SHAPE)
  if mnist_type in [MnistType.FAKE_DATA, MnistType.THRESHOLD]:
    images = tf.cast(images > 0.5, dtype=tf.int32)

  return images, labels, handle, training_iterator, heldout_iterator
def build_input_pipeline ( data_dir , batch_size , heldout_size , mnist_type ) : # Build an iterator over training batches. if mnist_type in [ MnistType . FAKE_DATA , MnistType . THRESHOLD ] : if mnist_type == MnistType . FAKE_DATA : mnist_data = build_fake_data ( ) else : mnist_data = mnist . read_data_sets ( data_dir ) training_dataset = tf . data . Dataset . from_tensor_slices ( ( mnist_data . train . images , np . int32 ( mnist_data . train . labels ) ) ) heldout_dataset = tf . data . Dataset . from_tensor_slices ( ( mnist_data . validation . images , np . int32 ( mnist_data . validation . labels ) ) ) elif mnist_type == MnistType . BERNOULLI : training_dataset = load_bernoulli_mnist_dataset ( data_dir , "train" ) heldout_dataset = load_bernoulli_mnist_dataset ( data_dir , "valid" ) else : raise ValueError ( "Unknown MNIST type." ) training_batches = training_dataset . repeat ( ) . batch ( batch_size ) training_iterator = tf . compat . v1 . data . make_one_shot_iterator ( training_batches ) # Build a iterator over the heldout set with batch_size=heldout_size, # i.e., return the entire heldout set as a constant. heldout_frozen = ( heldout_dataset . take ( heldout_size ) . repeat ( ) . batch ( heldout_size ) ) heldout_iterator = tf . compat . v1 . data . make_one_shot_iterator ( heldout_frozen ) # Combine these into a feedable iterator that can switch between training # and validation inputs. handle = tf . compat . v1 . placeholder ( tf . string , shape = [ ] ) feedable_iterator = tf . compat . v1 . data . Iterator . from_string_handle ( handle , training_batches . output_types , training_batches . output_shapes ) images , labels = feedable_iterator . get_next ( ) # Reshape as a pixel image and binarize pixels. images = tf . reshape ( images , shape = [ - 1 ] + IMAGE_SHAPE ) if mnist_type in [ MnistType . FAKE_DATA , MnistType . THRESHOLD ] : images = tf . cast ( images > 0.5 , dtype = tf . int32 ) return images , labels , handle , training_iterator , heldout_iterator
Builds an Iterator switching between train and heldout data.
Builds an Iterator switching between train and heldout data .