# tf.keras.backend.set_image_data_format

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| [![](https://www.tensorflow.org/images/GitHub-Mark-32px.png) View source on GitHub](https://github.com/keras-team/keras/tree/v2.14.0/keras/backend_config.py#L132-L157) |

Sets the value of the image data format convention.

    tf.keras.backend.set_image_data_format(
        data_format
    )

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| ## Args ||
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| `data_format` | string. `'channels_first'` or `'channels_last'`. |

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#### Example:

    tf.keras.backend.image_data_format()
    'channels_last'
    tf.keras.backend.set_image_data_format('channels_first')
    tf.keras.backend.image_data_format()
    'channels_first'
    tf.keras.backend.set_image_data_format('channels_last')

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| ## Raises ||
|---|---|
| `ValueError` | In case of invalid `data_format` value. |

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