# tf.keras.backend.update_sub

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|---|---|
| [![](https://www.tensorflow.org/images/tf_logo_32px.png) TensorFlow 1 version](https://www.tensorflow.org/versions/r1.15/api_docs/python/tf/keras/backend/update_sub) | [![](https://www.tensorflow.org/images/GitHub-Mark-32px.png) View source on GitHub](https://github.com/tensorflow/tensorflow/blob/v2.0.0/tensorflow/python/keras/backend.py#L1596-L1607) |

Update the value of `x` by subtracting `decrement`.

#### View aliases


**Compat aliases for migration**

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

[`tf.compat.v1.keras.backend.update_sub`](https://www.tensorflow.org/api_docs/python/tf/keras/backend/update_sub)

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    tf.keras.backend.update_sub(
        x, decrement
    )

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| ## Arguments ||
|---|---|
| `x` | A Variable. |
| `decrement` | A tensor of same shape as `x`. |

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| ## Returns ||
|---|---|
| The variable `x` updated. ||

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