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transformers/examples/pytorch/image-classification/README.md

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+Copyright 2021 The HuggingFace Team. All rights reserved.
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+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+# Image classification examples
+
+This directory contains 2 scripts that showcase how to fine-tune any model supported by the [`AutoModelForImageClassification` API](https://huggingface.co/docs/transformers/main/en/model_doc/auto#transformers.AutoModelForImageClassification) (such as [ViT](https://huggingface.co/docs/transformers/main/en/model_doc/vit), [ConvNeXT](https://huggingface.co/docs/transformers/main/en/model_doc/convnext), [ResNet](https://huggingface.co/docs/transformers/main/en/model_doc/resnet), [Swin Transformer](https://huggingface.co/docs/transformers/main/en/model_doc/swin)...) using PyTorch. They can be used to fine-tune models on both [datasets from the hub](#using-datasets-from-hub) as well as on [your own custom data](#using-your-own-data).
+
+<img src="https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/image_classification_inference_widget.png" height="400" />
+
+Try out the inference widget here: https://huggingface.co/google/vit-base-patch16-224
+
+Content:
+- [PyTorch version, Trainer](#pytorch-version-trainer)
+- [PyTorch version, no Trainer](#pytorch-version-no-trainer)
+
+## PyTorch version, Trainer
+
+Based on the script [`run_image_classification.py`](https://github.com/huggingface/transformers/blob/main/examples/pytorch/image-classification/run_image_classification.py).
+
+The script leverages the 🤗 [Trainer API](https://huggingface.co/docs/transformers/main_classes/trainer) to automatically take care of the training for you, running on distributed environments right away.
+
+### Using datasets from Hub
+
+Here we show how to fine-tune a Vision Transformer (`ViT`) on the [beans](https://huggingface.co/datasets/beans) dataset, to classify the disease type of bean leaves.
+
+```bash
+python run_image_classification.py \
+    --dataset_name beans \
+    --output_dir ./beans_outputs/ \
+    --remove_unused_columns False \
+    --label_column_name labels \
+    --do_train \
+    --do_eval \
+    --push_to_hub \
+    --push_to_hub_model_id vit-base-beans \
+    --learning_rate 2e-5 \
+    --num_train_epochs 5 \
+    --per_device_train_batch_size 8 \
+    --per_device_eval_batch_size 8 \
+    --logging_strategy steps \
+    --logging_steps 10 \
+    --eval_strategy epoch \
+    --save_strategy epoch \
+    --load_best_model_at_end True \
+    --save_total_limit 3 \
+    --seed 1337
+```
+
+👀 See the results here: [nateraw/vit-base-beans](https://huggingface.co/nateraw/vit-base-beans).
+
+Note that you can replace the model and dataset by simply setting the `model_name_or_path` and `dataset_name` arguments respectively, with any model or dataset from the [hub](https://huggingface.co/). For an overview of all possible arguments, we refer to the [docs](https://huggingface.co/docs/transformers/main_classes/trainer#transformers.TrainingArguments) of the `TrainingArguments`, which can be passed as flags.
+
+> If your model classification head dimensions do not fit the number of labels in the dataset, you can specify `--ignore_mismatched_sizes` to adapt it.
+
+### Using your own data
+
+To use your own dataset, there are 2 ways:
+- you can either provide your own folders as `--train_dir` and/or `--validation_dir` arguments
+- you can upload your dataset to the hub (possibly as a private repo, if you prefer so), and simply pass the `--dataset_name` argument.
+
+Below, we explain both in more detail.
+
+#### Provide them as folders
+
+If you provide your own folders with images, the script expects the following directory structure:
+
+```bash
+root/dog/xxx.png
+root/dog/xxy.png
+root/dog/[...]/xxz.png
+
+root/cat/123.png
+root/cat/nsdf3.png
+root/cat/[...]/asd932_.png
+```
+
+In other words, you need to organize your images in subfolders, based on their class. You can then run the script like this:
+
+```bash
+python run_image_classification.py \
+    --train_dir <path-to-train-root> \
+    --output_dir ./outputs/ \
+    --remove_unused_columns False \
+    --do_train \
+    --do_eval
+```
+
+Internally, the script will use the [`ImageFolder`](https://huggingface.co/docs/datasets/v2.0.0/en/image_process#imagefolder) feature which will automatically turn the folders into 🤗 Dataset objects.
+
+##### 💡 The above will split the train dir into training and evaluation sets
+  - To control the split amount, use the `--train_val_split` flag.
+  - To provide your own validation split in its own directory, you can pass the `--validation_dir <path-to-val-root>` flag.
+
+#### Upload your data to the hub, as a (possibly private) repo
+
+It's very easy (and convenient) to upload your image dataset to the hub using the [`ImageFolder`](https://huggingface.co/docs/datasets/v2.0.0/en/image_process#imagefolder) feature available in 🤗 Datasets. Simply do the following:
+
+```python
+from datasets import load_dataset
+
+# example 1: local folder
+dataset = load_dataset("imagefolder", data_dir="path_to_your_folder")
+
+# example 2: local files (supported formats are tar, gzip, zip, xz, rar, zstd)
+dataset = load_dataset("imagefolder", data_files="path_to_zip_file")
+
+# example 3: remote files (supported formats are tar, gzip, zip, xz, rar, zstd)
+dataset = load_dataset("imagefolder", data_files="https://download.microsoft.com/download/3/E/1/3E1C3F21-ECDB-4869-8368-6DEBA77B919F/kagglecatsanddogs_3367a.zip")
+
+# example 4: providing several splits
+dataset = load_dataset("imagefolder", data_files={"train": ["path/to/file1", "path/to/file2"], "test": ["path/to/file3", "path/to/file4"]})
+```
+
+`ImageFolder` will create a `label` column, and the label name is based on the directory name.
+
+Next, push it to the hub!
+
+```python
+# assuming you have ran the hf auth login command in a terminal
+dataset.push_to_hub("name_of_your_dataset")
+
+# if you want to push to a private repo, simply pass private=True:
+dataset.push_to_hub("name_of_your_dataset", private=True)
+```
+
+and that's it! You can now train your model by simply setting the `--dataset_name` argument to the name of your dataset on the hub (as explained in [Using datasets from the 🤗 hub](#using-datasets-from-hub)).
+
+More on this can also be found in [this blog post](https://huggingface.co/blog/image-search-datasets).
+
+### Sharing your model on 🤗 Hub
+
+0. If you haven't already, [sign up](https://huggingface.co/join) for a 🤗 account
+
+1. Make sure you have `git-lfs` installed and git set up.
+
+```bash
+$ apt install git-lfs
+$ git config --global user.email "you@example.com"
+$ git config --global user.name "Your Name"
+```
+
+2. Log in with your HuggingFace account credentials using `hf`:
+
+```bash
+$ hf auth login
+# ...follow the prompts
+```
+
+3. When running the script, pass the following arguments:
+
+```bash
+python run_image_classification.py \
+    --push_to_hub \
+    --push_to_hub_model_id <name-your-model> \
+    ...
+```
+
+## PyTorch version, no Trainer
+
+Based on the script [`run_image_classification_no_trainer.py`](https://github.com/huggingface/transformers/blob/main/examples/pytorch/image-classification/run_image_classification_no_trainer.py).
+
+Like `run_image_classification.py`, this script allows you to fine-tune any of the models on the [hub](https://huggingface.co/models) on an image classification task. The main difference is that this script exposes the bare training loop, to allow you to quickly experiment and add any customization you would like.
+
+It offers less options than the script with `Trainer` (for instance you can easily change the options for the optimizer
+or the dataloaders directly in the script) but still run in a distributed setup, and supports mixed precision by
+the means of the [🤗 `Accelerate`](https://github.com/huggingface/accelerate) library. You can use the script normally
+after installing it:
+
+```bash
+pip install git+https://github.com/huggingface/accelerate
+```
+
+You can then use your usual launchers to run in it in a distributed environment, but the easiest way is to run
+
+```bash
+accelerate config
+```
+
+and reply to the questions asked. Then
+
+```bash
+accelerate test
+```
+
+that will check everything is ready for training. Finally, you can launch training with
+
+```bash
+accelerate launch run_image_classification_no_trainer.py --image_column_name img
+```
+
+This command is the same and will work for:
+
+- single/multiple CPUs
+- single/multiple GPUs
+- TPUs
+
+Note that this library is in alpha release so your feedback is more than welcome if you encounter any problem using it.
+
+Regarding using custom data with this script, we refer to [using your own data](#using-your-own-data).