tf.train.batch(tensors, batch_size, num_threads=1, capacity=32, enqueue_many=False, shapes=None, dynamic_pad=False, allow_smaller_final_batch=False, shared_name=None, name=None)
Creates batches of tensors in tensors
.
The argument tensors
can be a list or a dictionary of tensors. The value returned by the function will be of the same type as tensors
.
This function is implemented using a queue. A QueueRunner
for the queue is added to the current Graph
's QUEUE_RUNNER
collection.
If enqueue_many
is False
, tensors
is assumed to represent a single example. An input tensor with shape [x, y, z]
will be output as a tensor with shape [batch_size, x, y, z]
.
If enqueue_many
is True
, tensors
is assumed to represent a batch of examples, where the first dimension is indexed by example, and all members of tensors
should have the same size in the first dimension. If an input tensor has shape [*, x, y, z]
, the output will have shape [batch_size, x,
y, z]
. The capacity
argument controls the how long the prefetching is allowed to grow the queues.
The returned operation is a dequeue operation and will throw tf.errors.OutOfRangeError
if the input queue is exhausted. If this operation is feeding another input queue, its queue runner will catch this exception, however, if this operation is used in your main thread you are responsible for catching this yourself.
N.B.: If dynamic_pad
is False
, you must ensure that either (i) the shapes
argument is passed, or (ii) all of the tensors in tensors
must have fully-defined shapes. ValueError
will be raised if neither of these conditions holds.
If dynamic_pad
is True
, it is sufficient that the rank of the tensors is known, but individual dimensions may have shape None
. In this case, for each enqueue the dimensions with value None
may have a variable length; upon dequeue, the output tensors will be padded on the right to the maximum shape of the tensors in the current minibatch. For numbers, this padding takes value 0. For strings, this padding is the empty string. See PaddingFIFOQueue
for more info.
If allow_smaller_final_batch
is True
, a smaller batch value than batch_size
is returned when the queue is closed and there are not enough elements to fill the batch, otherwise the pending elements are discarded. In addition, all output tensors' static shapes, as accessed via the get_shape
method will have a first Dimension
value of None
, and operations that depend on fixed batch_size would fail.
Args:
-
tensors
: The list or dictionary of tensors to enqueue. -
batch_size
: The new batch size pulled from the queue. -
num_threads
: The number of threads enqueuingtensors
. -
capacity
: An integer. The maximum number of elements in the queue. -
enqueue_many
: Whether each tensor intensors
is a single example. -
shapes
: (Optional) The shapes for each example. Defaults to the inferred shapes fortensors
. -
dynamic_pad
: Boolean. Allow variable dimensions in input shapes. The given dimensions are padded upon dequeue so that tensors within a batch have the same shapes. -
allow_smaller_final_batch
: (Optional) Boolean. IfTrue
, allow the final batch to be smaller if there are insufficient items left in the queue. -
shared_name
: (Optional). If set, this queue will be shared under the given name across multiple sessions. -
name
: (Optional) A name for the operations.
Returns:
A list or dictionary of tensors with the same types as tensors
.
Raises:
-
ValueError
: If theshapes
are not specified, and cannot be inferred from the elements oftensors
.
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