def ones(shape, dtype=None, name=None):
"""Instantiates an all-ones tensor variable and returns it.
Arguments:
shape: Tuple of integers, shape of returned Keras variable.
dtype: String, data type of returned Keras variable.
name: String, name of returned Keras variable.
Returns:
A Keras variable, filled with `1.0`.
Example:
```python
>>> from keras import backend as K
>>> kvar = K.ones((3,4))
>>> K.eval(kvar)
array([[ 1., 1., 1., 1.],
[ 1., 1., 1., 1.],
[ 1., 1., 1., 1.]], dtype=float32)
"""
if dtype is None:
dtype = floatx()
shape = tuple(map(int, shape))
tf_dtype = _convert_string_dtype(dtype)
return variable(
init_ops.constant_initializer(1., dtype=tf_dtype)(shape), dtype, name)```
