https://github.com/surmenok/keras_lr_finder

Plots the change of the loss function of a Keras model when the learning rate is exponentially increasing.
https://github.com/surmenok/keras_lr_finder

Last synced: 7 days ago
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Plots the change of the loss function of a Keras model when the learning rate is exponentially increasing.

• Host: GitHub
• URL: https://github.com/surmenok/keras_lr_finder
• Owner: surmenok
• License: mit
• Created: 2017-12-11T03:18:18.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2020-07-04T17:57:29.000Z (over 4 years ago)
• Last Synced: 2024-09-18T18:08:46.805Z (about 2 months ago)
• Language: Python
• Size: 53.7 KB
• Stars: 254
• Watchers: 8
• Forks: 65
• Open Issues: 19
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# keras_lr_finder

Plots the change of the loss function of a Keras model when the learning rate is exponentially increasing.

## Purpose

See details in ["Estimating an Optimal Learning Rate For a Deep Neural Network"](https://towardsdatascience.com/estimating-optimal-learning-rate-for-a-deep-neural-network-ce32f2556ce0).

## Usage

Create and compile a Keras model, then execute this code:

```python

# model is a Keras model

lr_finder = LRFinder(model)

# Train a model with batch size 512 for 5 epochs

# with learning rate growing exponentially from 0.0001 to 1

lr_finder.find(x_train, y_train, start_lr=0.0001, end_lr=1, batch_size=512, epochs=5)

```

```python

# Plot the loss, ignore 20 batches in the beginning and 5 in the end

lr_finder.plot_loss(n_skip_beginning=20, n_skip_end=5)

```

![Loss function](https://cdn-images-1.medium.com/max/1600/1*HVj_4LWemjvOWv-cQO9y9g.png)

```python

# Plot rate of change of the loss

# Ignore 20 batches in the beginning and 5 in the end

# Smooth the curve using simple moving average of 20 batches

# Limit the range for y axis to (-0.02, 0.01)

lr_finder.plot_loss_change(sma=20, n_skip_beginning=20, n_skip_end=5, y_lim=(-0.01, 0.01))

```

![Rate of change of the loss function](https://cdn-images-1.medium.com/max/1600/1*87mKq_XomYyJE29l91K0dw.png)

## Contributions

Contributions are welcome. Please, file issues and submit pull requests on GitHub, or contact me directly.

## References

This code is based on:

- The method described in section 3.3 of the 2015 paper ["Cyclical Learning Rates for Training Neural Networks"](https://arxiv.org/abs/1506.01186) by Leslie N. Smith

- The implementation of the algorithm in [fastai library](https://github.com/fastai/fastai) by Jeremy Howard. See [fast.ai deep learning course](http://course.fast.ai/) for details.