# tf.keras.applications.densenet.DenseNet121

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| [![](https://www.tensorflow.org/images/GitHub-Mark-32px.png) View source on GitHub](https://github.com/keras-team/keras/tree/v2.13.1/keras/applications/densenet.py#L345-L367) |

Instantiates the Densenet121 architecture.

#### View aliases


**Main aliases**

[`tf.keras.applications.DenseNet121`](https://www.tensorflow.org/api_docs/python/tf/keras/applications/densenet/DenseNet121)
**Compat aliases for migration**

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

\`tf.compat.v1.keras.applications.DenseNet121\`, \`tf.compat.v1.keras.applications.densenet.DenseNet121\`

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    tf.keras.applications.densenet.DenseNet121(
        include_top=True,
        weights='imagenet',
        input_tensor=None,
        input_shape=None,
        pooling=None,
        classes=1000,
        classifier_activation='softmax'
    )

#### Reference:

- [Densely Connected Convolutional Networks](https://arxiv.org/abs/1608.06993) (CVPR 2017)

Optionally loads weights pre-trained on ImageNet.
Note that the data format convention used by the model is
the one specified in your Keras config at `~/.keras/keras.json`.

> [!NOTE]
> **Note:** each Keras Application expects a specific kind of input preprocessing. For DenseNet, call [`tf.keras.applications.densenet.preprocess_input`](https://www.tensorflow.org/versions/r2.13/api_docs/python/tf/keras/applications/densenet/preprocess_input) on your inputs before passing them to the model.

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| ## Args ||
|---|---|
| `include_top` | whether to include the fully-connected layer at the top of the network. |
| `weights` | one of `None` (random initialization), 'imagenet' (pre-training on ImageNet), or the path to the weights file to be loaded. |
| `input_tensor` | optional Keras tensor (i.e. output of [`layers.Input()`](https://www.tensorflow.org/versions/r2.13/api_docs/python/tf/keras/Input)) to use as image input for the model. |
| `input_shape` | optional shape tuple, only to be specified if `include_top` is False (otherwise the input shape has to be `(224, 224, 3)` (with `'channels_last'` data format) or `(3, 224, 224)` (with `'channels_first'` data format). It should have exactly 3 inputs channels, and width and height should be no smaller than 32. E.g. `(200, 200, 3)` would be one valid value. |
| `pooling` | Optional pooling mode for feature extraction when `include_top` is `False`. <br /> - `None` means that the output of the model will be the 4D tensor output of the last convolutional block. - `avg` means that global average pooling will be applied to the output of the last convolutional block, and thus the output of the model will be a 2D tensor. - `max` means that global max pooling will be applied. |
| `classes` | optional number of classes to classify images into, only to be specified if `include_top` is True, and if no `weights` argument is specified. |
| `classifier_activation` | A `str` or callable. The activation function to use on the "top" layer. Ignored unless `include_top=True`. Set `classifier_activation=None` to return the logits of the "top" layer. When loading pretrained weights, `classifier_activation` can only be `None` or `"softmax"`. |

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| ## Returns ||
|---|---|
| A Keras model instance. ||

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