Operations

Develop custom deep learning functions

For most tasks, you can use built-in layers. If there is not a built-in layer that you need for your task, then you can define your own custom layer. You can define custom layers with learnable and state parameters. After you define a custom layer, you can check that the layer is valid, GPU compatible, and outputs correctly defined gradients. To learn more, see Define Custom Deep Learning Layers. For a list of supported layers, see List of Deep Learning Layers.

Use deep learning operations to develop MATLAB^® code for custom layers, training loops, and model functions.

Functions

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Automatic Differentiation

`dlarray`	Deep learning array for customization
`dims`	Data format of `dlarray` object
`finddim`	Find dimensions with specified label
`stripdims`	Remove `dlarray` data format
`extractdata`	Extract data from `dlarray`
`isdlarray`	Check if object is `dlarray` (Since R2020b)

Deep Learning Operations

`dlconv`	Deep learning convolution
`dltranspconv`	Deep learning transposed convolution
`lstm`	Long short-term memory
`gru`	Gated recurrent unit
`attention`	Dot-product attention (Since R2022b)
`embed`	Embed discrete data (Since R2020b)
`fullyconnect`	Sum all weighted input data and apply a bias
`dlode45`	Deep learning solution of nonstiff ordinary differential equation (ODE) (Since R2021b)
`batchnorm`	Normalize data across all observations for each channel independently
`crosschannelnorm`	Cross channel square-normalize using local responses
`groupnorm`	Normalize data across grouped subsets of channels for each observation independently (Since R2020b)
`instancenorm`	Normalize across each channel for each observation independently (Since R2021a)
`layernorm`	Normalize data across all channels for each observation independently (Since R2021a)
`avgpool`	Pool data to average values over spatial dimensions
`maxpool`	Pool data to maximum value
`maxunpool`	Unpool the output of a maximum pooling operation

Activations

`relu`	Apply rectified linear unit activation
`leakyrelu`	Apply leaky rectified linear unit activation
`gelu`	Apply Gaussian error linear unit (GELU) activation (Since R2022b)
`softmax`	Apply softmax activation to channel dimension
`sigmoid`	Apply sigmoid activation

Loss Operations

`crossentropy`	Cross-entropy loss for classification tasks
`indexcrossentropy`	Index cross-entropy loss for classification tasks (Since R2024b)
`l1loss`	L₁ loss for regression tasks (Since R2021b)
`l2loss`	L₂ loss for regression tasks (Since R2021b)
`huber`	Huber loss for regression tasks (Since R2021a)
`ctc`	Connectionist temporal classification (CTC) loss for unaligned sequence classification (Since R2021a)
`mse`	Half mean squared error

Function Acceleration

`dlaccelerate`	Accelerate deep learning function for custom training loops (Since R2021a)
`AcceleratedFunction`	Accelerated deep learning function (Since R2021a)
`clearCache`	Clear accelerated deep learning function trace cache (Since R2021a)

Topics

Automatic Differentiation

Automatic Differentiation Background
Learn how automatic differentiation works.
Use Automatic Differentiation In Deep Learning Toolbox
How to use automatic differentiation in deep learning.
List of Functions with dlarray Support
View the list of functions that support dlarray objects.
Define Custom Deep Learning Operations
Learn how to define custom deep learning operation.
Specify Custom Operation Backward Function
This example shows how to define the SReLU operation as a differentiable function and specify a custom backward function.
Train Model Using Custom Backward Function
This example shows how to train a deep learning model that contains an operation with a custom backward function.
Create Bidirectional LSTM (BiLSTM) Function
This example shows how to create a bidirectional long-short term memory (BiLSTM) function for custom deep learning functions. (Since R2023b)

Model Functions

Train Network Using Model Function
This example shows how to create and train a deep learning network by using functions rather than a layer graph or a dlnetwork.
Update Batch Normalization Statistics Using Model Function
This example shows how to update the network state in a network defined as a function.
Make Predictions Using Model Function
This example shows how to make predictions using a model function by splitting data into mini-batches.
Initialize Learnable Parameters for Model Function
Learn how to initialize learnable parameters for custom training loops using a model function.

Deep Learning Function Acceleration

Deep Learning Function Acceleration for Custom Training Loops
Accelerate model functions and model loss functions for custom training loops by caching and reusing traces.
Accelerate Custom Training Loop Functions
This example shows how to accelerate deep learning custom training loop and prediction functions.
Check Accelerated Deep Learning Function Outputs
This example shows how to check that the outputs of accelerated functions match the outputs of the underlying function.
Evaluate Performance of Accelerated Deep Learning Function
This example shows how to evaluate the performance gains of using an accelerated function.

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