def ones_like(x, dtype=None, name=None):
"""Instantiates an all-ones Keras variable
of the same shape as another Keras variable or tensor and returns it.
# Arguments
x: Keras variable or tensor.
dtype: String, dtype of returned Keras variable.
None uses the dtype of x.
# Returns
A Keras variable with the shape of x filled with ones.
# Example
```python
>>> from keras import backend as K
>>> kvar = K.variable(np.random.random((2,3)))
>>> kvar_ones = K.ones_like(kvar)
>>> K.eval(kvar_ones)
array([[ 1., 1., 1.],
[ 1., 1., 1.]], dtype=float32)
"""
return tf.ones_like(x, dtype=dtype, name=name)```
