✨ Add PyTorch image classification example (#13134)

* ✨ add pytorch image classification example

* 🔥 remove utils.py

* 💄 fix flake8 style issues

* 🔥 remove unnecessary line

* ✨ limit dataset sizes

* 📌 update reqs

* 🎨 restructure - use datasets lib

* 🎨 import transforms directly

* 📝 add comments

* 💄 style

* 🔥 remove flag

* 📌 update requirement warning

* 📝 add vision README.md

* 📝 update README.md

* 📝 update README.md

* 🎨 add image-classification tag to model card

* 🚚 rename vision ➡️ image-classification

* 📝 update image-classification README.md

examples/pytorch/image-classification/README.md

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+<!---
+Copyright 2021 The HuggingFace Team. All rights reserved.
+
+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
+
+The following examples showcase how to fine-tune a `ViT` for image-classification using PyTorch.
+
+## Using datasets from 🤗 `datasets`
+
+Here we show how to fine-tune a `ViT` on the [beans](https://huggingface.co/datasets/beans) dataset.
+
+👀 See the results here: [nateraw/vit-base-beans](https://huggingface.co/nateraw/vit-base-beans).
+
+```bash
+python run_image_classification.py \
+    --dataset_name beans \
+    --output_dir ./beans_outputs/ \
+    --remove_unused_columns False \
+    --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 \
+    --evaluation_strategy epoch \
+    --save_strategy epoch \
+    --load_best_model_at_end True \
+    --save_total_limit 3 \
+    --seed 1337
+```
+
+Here we show how to fine-tune a `ViT` on the [cats_vs_dogs](https://huggingface.co/datasets/cats_vs_dogs) dataset.
+
+👀 See the results here: [nateraw/vit-base-cats-vs-dogs](https://huggingface.co/nateraw/vit-base-cats-vs-dogs).
+
+```bash
+python run_image_classification.py \
+    --dataset_name cats_vs_dogs \
+    --output_dir ./cats_vs_dogs_outputs/ \
+    --remove_unused_columns False \
+    --do_train \
+    --do_eval \
+    --push_to_hub \
+    --push_to_hub_model_id vit-base-cats-vs-dogs \
+    --fp16 True \
+    --learning_rate 2e-4 \
+    --num_train_epochs 5 \
+    --per_device_train_batch_size 32 \
+    --per_device_eval_batch_size 32 \
+    --logging_strategy steps \
+    --logging_steps 10 \
+    --evaluation_strategy epoch \
+    --save_strategy epoch \
+    --load_best_model_at_end True \
+    --save_total_limit 3 \
+    --seed 1337
+```
+
+## Using your own data
+
+To use your own dataset, the training 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
+```
+
+Once you've prepared your dataset, you can can run the script like this:
+
+```bash
+python run_image_classification.py \
+    --dataset_name nateraw/image-folder \
+    --train_dir <path-to-train-root> \
+    --output_dir ./outputs/ \
+    --remove_unused_columns False \
+    --do_train \
+    --do_eval
+```
+
+### 💡 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.
+
+
+## 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 `huggingface-cli`
+
+```bash
+$ huggingface-cli 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> \
+    ...
+```

examples/pytorch/image-classification/requirements.txt

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+torch>=1.9.0
+torchvision>=0.10.0