This node performs supervised training of a feedforward deep learning model for regression. Thereby, the learning procedure
can be adjusted using several training methods and parameters, which can be customized in the node dialog. Additionally,
the node supplies further methods for regularization, gradient normalization and learning refinements. The learner
node automatically adds an output layer to the network configuration, which can be also configured in the node
dialog. For regression, the output layer will always use 'identity' as the activation function and the number
of outputs will be automatically set to match the number target values. The output of the node is a trained deep
learning model which can be used to predict target values.

The KNIME Deeplearning4J Integration has been marked as legacy with KNIME Analytics Platform 5.0 and will be deprecated in a future version. If you are using this extension in a production workflow, consider switching to one of the other deep learning integrations available in KNIME Analytics Platform.

- Number of Training Iterations
- The number of parameter updates that will be done on one batch of input data.
- Optimization Algorithm
- The type of optimization method to use. The following algorithms are available:
- Line Gradient Descent
- Conjugate Gradient Descent
- Hessian Free
- LBFGS
- Stochastic Gradient Descent

For Line Gradient Descent, Conjugate Gradient Descent, and LBFGS the maximum number of line search iterations can be specified. - Updater
- The type of updater to use. These specify how the raw gradients will be modified. If this option is unchecked the node tries
to use an updater from a previously trained network if available. If not available the default will be used (NESTEROVS). Some
of the updater types may have additional coefficients which can be adjusted. The The following methods are available:
- SGD
- ADAM (ADAM Mean Decay, ADAM Var Decay)
- ADADELTA (RHO)
- NESTEROVS (Momentum, Schedule)

Nesterovs Schedule:

Schedule - Schedule for momentum value change during training. This is specified in the following format:

'iteration':'momentum rate','iteration':'momentum rate' ...

This creates a map, which maps the iteration to the momentum rate that should be used. E.g. '2:0.8' means that the rate '0.8' should be used in iteration '2'. Leave empty if you do not want to use a schedule. - ADAGRAD
- RMSPROP (RMS Decay)

An explanation of these methods and their coefficients can be found here. - Random Seed
- The seed value which should be used in order to compare training runs. Any Integer number may be used.
- Regularization
- The L1 and L2 regularization coefficients.
- Gradient Normalization
- Gradient normalization strategies. These are applied on raw gradients, before the gradients are passed to the updater.
An explanation can be found here.
- Renormalize L2 Per Layer
- Renormalize L2 Per Param Type
- ClipElement Wise Absolute Value
- Clip L2 Per Layer
- Clip L2 Per Param Type

For 'ClipElement Wise Absolute Value', 'Clip L2 Per Layer', and 'Clip L2 Per Param Type' you can additionally specify a threshold value.

- Global Learning Rate
- The learning rate for the whole network. If not used the learning rate specified in each layer will be used.
- Global Drop-Out Rate
- The drop-out rate for the whole network. If not used the drop-out rate specified in each layer will be used.
- Use Drop-Connect?
- Whether to use Drop Connect.
- Global Weight Initialization Strategy
- The weight initialization strategy to use for the whole network.
- Global Bias - Learning Rate
- The bias learning rate for the whole network if you want to use a different learning rate for the bias.
- Global Bias - Initialization
- The value to initialize all biases with.

- Batch Size
- The number of examples used for one minibatch.
- Epochs
- The number of epochs to train the network, hence the number of training runs on the whole data set.
- Size of Input Image
- If the input table contains images and a convolutional network is used, the dimensionality of the images needs to be specified. This value needs to be three numbers separated by a comma specifying the dimension sizes of the images (size x,size y,number of channels). E.g. 64,64,3

- Target Column Selection
- The column/s of the input table that should be used as targets for regression. These will also specify the length of the resulting output vector created by a Predictor Node. This means that the number of outputs will be set to the length of the target vector.
- Feature Column Selection
- The column/s of the input table containing the training data for the network.

- Learning Rate
- The learning rate that should be used for this layer.
- Weight Initialization Strategy
- The strategy which will be used to set the initial weights for this layer.
- Loss Function
- The type of loss function that should be used for this layer.

- Learning Status
- Shows information about the current learning run. Has an option for early stopping of training. If training is stopped before the last epoch the model will be saved in the current status.

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To use this node in KNIME, install the extension KNIME Deeplearning4J Integration (64bit only) (legacy) from the below update site following our NodePit Product and Node Installation Guide:

v5.3

A zipped version of the software site can be downloaded here.

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