tf.keras.backend.placeholder(
shape=None,
ndim=None,
dtype=None,
sparse=False,
name=None
)
Defined in tensorflow/python/keras/backend.py
.
Instantiates a placeholder tensor and returns it.
Arguments:
shape
: Shape of the placeholder (integer tuple, may includeNone
entries).ndim
: Number of axes of the tensor. At least one of {shape
,ndim
} must be specified. If both are specified,shape
is used.dtype
: Placeholder type.sparse
: Boolean, whether the placeholder should have a sparse type.name
: Optional name string for the placeholder.
Raises:
ValueError
: If called with eager execution.
Returns:
Tensor instance (with Keras metadata included).
Examples:
python
>>> from keras import backend as K
>>> input_ph = K.placeholder(shape=(2, 4, 5))
>>> input_ph
<tf.Tensor 'Placeholder_4:0' shape=(2, 4, 5) dtype=float32>