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optimum-graphcore

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Blazing fast training of 🤗 Transformers on Graphcore IPUs

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# Optimum Graphcore

🤗 Optimum Graphcore is the interface between the 🤗 Transformers library and [Graphcore IPUs](https://www.graphcore.ai/products/ipu).
It provides a set of tools enabling model parallelization and loading on IPUs, training, fine-tuning and inference on all the tasks already supported by 🤗 Transformers while being compatible with the 🤗 Hub and every model available on it out of the box.

## What is an Intelligence Processing Unit (IPU)?
Quote from the Hugging Face [blog post](https://huggingface.co/blog/graphcore#what-is-an-intelligence-processing-unit):
>IPUs are the processors that power Graphcore’s IPU-POD datacenter compute systems. This new type of processor is designed to support the very specific computational requirements of AI and machine learning. Characteristics such as fine-grained parallelism, low precision arithmetic, and the ability to handle sparsity have been built into our silicon.

> Instead of adopting a SIMD/SIMT architecture like GPUs, Graphcore’s IPU uses a massively parallel, MIMD architecture, with ultra-high bandwidth memory placed adjacent to the processor cores, right on the silicon die.

> This design delivers high performance and new levels of efficiency, whether running today’s most popular models, such as BERT and EfficientNet, or exploring next-generation AI applications.

## Poplar SDK setup
A Poplar SDK environment needs to be enabled to use this library. Please refer to Graphcore's [Getting Started](https://docs.graphcore.ai/en/latest/getting-started.html) guides.

## Install
To install the latest release of this package:

`pip install optimum-graphcore`

Optimum Graphcore is a fast-moving project, and you may want to install from source.

`pip install git+https://github.com/huggingface/optimum-graphcore.git`

### Installing in developer mode

If you are working on the `optimum-graphcore` code then you should use an editable install
by cloning and installing `optimum` and `optimum-graphcore`:

```
git clone https://github.com/huggingface/optimum --branch v1.6.1-release
git clone https://github.com/huggingface/optimum-graphcore
pip install -e optimum -e optimum-graphcore
```

Now whenever you change the code, you'll be able to run with those changes instantly.

## Running the examples

There are a number of examples provided in the `examples` directory. Each of these contains a README with command lines for running them on IPUs with Optimum Graphcore.

Please install the requirements for every example:

```
cd <example-folder>
pip install -r requirements.txt
```

## How to use Optimum Graphcore
🤗 Optimum Graphcore was designed with one goal in mind: **make training and evaluation straightforward for any 🤗 Transformers user while leveraging the complete power of IPUs.**
It requires minimal changes if you are already using 🤗 Transformers.

To immediately use a model on a given input (text, image, audio, ...), we support the `pipeline` API:

```diff
->>> from transformers import pipeline
+>>> from optimum.graphcore import pipeline

# Allocate a pipeline for sentiment-analysis
->>> classifier = pipeline('sentiment-analysis', model="distilbert-base-uncased-finetuned-sst-2-english")
+>>> classifier = pipeline('sentiment-analysis', model="distilbert-base-uncased-finetuned-sst-2-english", ipu_config = "Graphcore/distilbert-base-ipu")
>>> classifier('We are very happy to introduce pipeline to the transformers repository.')
[{'label': 'POSITIVE', 'score': 0.9996947050094604}]
```

It is also super easy to use the `Trainer` API:

```diff
-from transformers import Trainer, TrainingArguments
+from optimum.graphcore import IPUConfig, IPUTrainer, IPUTrainingArguments

-training_args = TrainingArguments(
+training_args = IPUTrainingArguments(
     per_device_train_batch_size=4,
     learning_rate=1e-4,
+    # Any IPUConfig on the Hub or stored locally
+    ipu_config_name="Graphcore/bert-base-ipu",
+)
+
+# Loading the IPUConfig needed by the IPUTrainer to compile and train the model on IPUs
+ipu_config = IPUConfig.from_pretrained(
+    training_args.ipu_config_name,
 )

# Initialize our Trainer
-trainer = Trainer(
+trainer = IPUTrainer(
     model=model,
+    ipu_config=ipu_config,
     args=training_args,
     train_dataset=train_dataset if training_args.do_train else None,
     ...  # Other arguments
```

For more information, refer to the full [🤗 Optimum Graphcore documentation](https://huggingface.co/docs/optimum/graphcore_index).

## Supported models
The following model architectures and tasks are currently supported by 🤗 Optimum Graphcore:
|            | Pre-Training | Masked LM | Causal LM | Seq2Seq LM (Summarization, Translation, etc) | Sequence Classification | Token Classification | Question Answering | Multiple Choice | Image Classification | CTC |
|------------|--------------|-----------|-----------|----------------------------------------------|-------------------------|----------------------|--------------------|-----------------|----------------------| ------------ |
| BART       | ✅            |           | ❌         | ✅                                            | ✅                       |                      | ❌                  |                 |                      |             |
| BERT       | ✅            | ✅         | ❌         |                                              | ✅                       | ✅                    | ✅                  | ✅               |                      |             |
| ConvNeXt   | ✅            |           |           |                                              |                         |                      |                    |                 | ✅                    |             |
| DeBERTa    | ✅            | ✅         |           |                                              | ✅                       | ✅                    | ✅                  |                 |                      |             |
| DistilBERT | ❌            | ✅         |           |                                              | ✅                       | ✅                    | ✅                  | ✅               |                      |             |
| GPT-2      | ✅            |           | ✅         |                                              | ✅                       | ✅                    |                    |                 |                      |             |
| [GroupBERT](https://arxiv.org/abs/2106.05822)   | ✅            | ✅         | ❌         |                                              | ✅                       | ✅                    | ✅                  | ✅               |                      |             |
| HuBERT     | ❌            |           |           |                                              | ✅                       |                      |                    |                 |                      |       ✅      |
| LXMERT     | ❌            |           |           |                                              |                         |                      | ✅                  |                 |                      |             |
| RoBERTa    | ✅            | ✅         | ❌         |                                              | ✅                       | ✅                    | ✅                  | ✅               |                      |             |
| T5         | ✅            |           |           | ✅                                            |                         |                      |                    |                 |                      |             |
| ViT        | ❌            |           |           |                                              |                         |                      |                    |                 | ✅                    |             |
| Wav2Vec2   | ✅            |           |           |                                              |                         |                      |                    |                 |                      |      ✅        |
| Whisper   |    ❌          |           |           |                    ✅                           |                          |                      |                    |                 |                      |              |

If you find any issue while using those, please open an issue or a pull request.

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