This is a little project to practice images classification and state-of-the-art CNN architecture implementation on a small dataset. The data is from the Plant Pathology 2020 - FGVC7 hosted on Kaggle.

The dataset is composed of two sets of 1841 high definition images of apple tree leafs, covering four categories of them: healthy, scab infected, rust infected and infected with multiple diseases. The goal is map unseen images to those classes.

The repository is organized around a notebook implementing each steps of a classic ML experiment pipeline:

• Loading data and instantiating the custom class representing training, validation and test datasets, implemented in dataset.py. Pytorch is the main library used for modeling, and as such a derivate of its abstract class Dataset is used to define images transformations and supply (sample, label) tuples for training and validation, or samples singletons for testing. The package albumentations is used to apply variety of transforms to the images. Because the training set is rather small, a simple oversampling strategy is implemented: each image is used several times with randomized transforms.

• Modeling, training and evaluation. The model is a custom implementation of the wide variant of the ResNet architecture, as described in the paper Wide Residual Networks and found in models.py. This goal of this project being mainly to practice pytorch and CNN architectures, no pre-trained or pre-implemented models are used. These architectures have a lot of parameters and are known to easily overfit on small datasets, hence only a rather shallow one is used.

For readability, most of the code is packaged dedicated files:

• dataset custom class and data utilities in dataset.py
• Wide ResNet implementation, training/validation loops in models.py

Just clone this repository:

git clone https://github.com/clabrugere/plant-pathology-classification.git

Download the dataset from Kaggle and put it in:

data/

• python 3.7
• numpy
• pandas
• matplotlib
• cv2
• albumentations
• pytorch
• sklearn

This project is licensed under the MIT License - see the LICENSE.md file for details

• Plant Pathology 2020 - FGVC7
• Wide Residual Networks