# tf.keras.backend.ones

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|---|---|
| [![](https://www.tensorflow.org/images/tf_logo_32px.png) TensorFlow 2 version](https://www.tensorflow.org/api_docs/python/tf/keras/backend/ones) | [![](https://www.tensorflow.org/images/GitHub-Mark-32px.png) View source on GitHub](https://github.com/tensorflow/tensorflow/blob/v1.15.0/tensorflow/python/keras/backend.py#L1308-L1340) |

Instantiates an all-ones variable and returns it.

#### View aliases


**Compat aliases for migration**

See
[Migration guide](https://www.tensorflow.org/guide/migrate) for
more details.

[`tf.compat.v1.keras.backend.ones`](https://www.tensorflow.org/api_docs/python/tf/keras/backend/ones), \`tf.compat.v2.keras.backend.ones\`

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    tf.keras.backend.ones(
        shape, dtype=None, name=None
    )

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| ## 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. |

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| ## Returns ||
|---|---|
| A Keras variable, filled with `1.0`. Note that if `shape` was symbolic, we cannot return a variable, and will return a dynamically-shaped tensor instead. ||

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#### Example:

    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)