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hyperparameter tuning is a critical process in training neural networks, as it can significantly affect the model's performance. hyperparameters are the parameters that are set before the learning process begins, such as learning rate, batch size, number of epochs, and architecture-specific parameters like the number of layers or units in each layer.

in this tutorial, we will cover:

1. *understanding hyperparameters*
2. *common hyperparameters in neural networks*
3. *methods for hyperparameter tuning*
4. *example using keras and scikit-learn for tuning hyperparameters*

1. understanding hyperparameters

hyperparameters are different from model parameters, which are learned during training. they control the training process and the structure of the model. common hyperparameters include:

**learning rate**: the step size at each iteration while moving toward a minimum of the loss function.
**batch size**: the number of training examples utilized in one iteration.
**number of epochs**: the number of complete passes through the training dataset.
**number of layers/units**: the architecture of the neural network, including how many hidden layers and the number of neurons in each layer.
**dropout rate**: the fraction of the input units to drop during training to prevent overfitting.

2. common hyperparameters in neural networks

here are some common hyperparameters for neural networks:

**learning rate**: common values are `0.01`, `0.001`, `0.0001`.
**batch size**: common values are `32`, `64`, `128`.
**number of epochs**: common values are `10`, `50`, `100`.
**number of neurons in hidden layers**: common values are `32`, `64`, `128`, etc.
**dropout rate**: common values are `0.1`, `0.2`, `0.5`.

3. methods for hyperparameter tuning

there are several methods for hyperparameter tuning:

**grid search**: a brute-force approach that evaluates all possible combinations of hyperparameters.
**random search**: randomly samples combinations, ...

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