---
myst:
  html_meta:
    description: Dropout layers in PyTorch C++ — Dropout, Dropout2d, Dropout3d, AlphaDropout, and FeatureAlphaDropout.
    keywords: PyTorch, C++, Dropout, Dropout2d, Dropout3d, AlphaDropout, regularization
---

# Dropout Layers

Dropout randomly zeros elements during training as a regularization technique,
preventing overfitting by forcing the network to learn redundant representations.
During evaluation, dropout is disabled and outputs are scaled appropriately.

- **Dropout**: Standard dropout for fully-connected layers
- **Dropout2d/3d**: Spatial dropout that zeros entire channels (better for CNNs)
- **AlphaDropout**: Maintains self-normalizing property (use with SELU activation)

```{note}

Remember to call `model->train()` during training and `model->eval()` during
inference to properly enable/disable dropout behavior.
```

## Dropout

```{doxygenclass} torch::nn::Dropout
:members:
:undoc-members:
```

```{doxygenclass} torch::nn::DropoutImpl
:members:
:undoc-members:
```

**Example:**

```cpp
auto dropout = torch::nn::Dropout(torch::nn::DropoutOptions(0.5));
```

## Dropout2d / Dropout3d

```{doxygenclass} torch::nn::Dropout2d
:members:
:undoc-members:
```

```{doxygenclass} torch::nn::Dropout2dImpl
:members:
:undoc-members:
```

```{doxygenclass} torch::nn::Dropout3d
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:undoc-members:
```

```{doxygenclass} torch::nn::Dropout3dImpl
:members:
:undoc-members:
```

## AlphaDropout

```{doxygenclass} torch::nn::AlphaDropout
:members:
:undoc-members:
```

```{doxygenclass} torch::nn::AlphaDropoutImpl
:members:
:undoc-members:
```

## FeatureAlphaDropout

```{doxygenclass} torch::nn::FeatureAlphaDropout
:members:
:undoc-members:
```

```{doxygenclass} torch::nn::FeatureAlphaDropoutImpl
:members:
:undoc-members:
```