Optimum Habana

🤗 Optimum Habana is the interface between the 🤗 Transformers and Diffusers libraries and Habana's Gaudi processor (HPU). It provides a set of tools enabling easy model loading, training and inference on single- and multi-HPU settings for different downstream tasks. The list of officially validated models and tasks is available here. Users can try other models and tasks with only few changes.

What is a Habana Processing Unit (HPU)?

HPUs offer fast model training and inference as well as a great price-performance ratio. Check out this blog post about BERT pre-training and this article benchmarking Habana Gaudi2 versus Nvidia A100 GPUs for concrete examples. If you are not familiar with HPUs and would like to know more about them, we recommend you take a look at our conceptual guide.

Install

To install the latest release of this package:

pip install optimum[habana]

To use DeepSpeed on HPUs, you also need to run the following command:

pip install git+https://github.com/HabanaAI/DeepSpeed.git@1.9.0

Optimum Habana is a fast-moving project, and you may want to install it from source:

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

Last but not least, don't forget to install the requirements for every example:

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

How to use it?

Quick Start

🤗 Optimum Habana was designed with one goal in mind: to make training and inference straightforward for any 🤗 Transformers and 🤗 Diffusers user while leveraging the complete power of Gaudi processors.

Transformers Interface

There are two main classes one needs to know:

• GaudiTrainer: the trainer class that takes care of compiling (lazy or eager mode) and distributing the model to run on HPUs, and performing training and evaluation.
• GaudiConfig: the class that enables to configure Habana Mixed Precision and to decide whether optimized operators and optimizers should be used or not.

The GaudiTrainer is very similar to the 🤗 Transformers Trainer, and adapting a script using the Trainer to make it work with Gaudi will mostly consist in simply swapping the Trainer class for the GaudiTrainer one. That's how most of the example scripts were adapted from their original counterparts.

Original script:

from transformers import Trainer, TrainingArguments

training_args = TrainingArguments(
  # training arguments...
)

# A lot of code here

# Initialize our Trainer
trainer = Trainer(
    model=model,
    args=training_args,  # Original training arguments.
    train_dataset=train_dataset if training_args.do_train else None,
    eval_dataset=eval_dataset if training_args.do_eval else None,
    compute_metrics=compute_metrics,
    tokenizer=tokenizer,
    data_collator=data_collator,
)

Transformed version that can run on Gaudi:

from optimum.habana import GaudiConfig, GaudiTrainer, GaudiTrainingArguments

training_args = GaudiTrainingArguments(
  # same training arguments...
  use_habana=True,
  use_lazy_mode=True,  # whether to use lazy or eager mode
  use_hpu_graphs=True,  # whether to use HPU graphs for inference
  gaudi_config_name=path_to_gaudi_config,
)

# A lot of the same code as the original script here

# Initialize our Trainer
trainer = GaudiTrainer(
    model=model,
    # You can manually specify the Gaudi configuration to use with
    # gaudi_config=my_gaudi_config
    args=training_args,
    train_dataset=train_dataset if training_args.do_train else None,
    eval_dataset=eval_dataset if training_args.do_eval else None,
    compute_metrics=compute_metrics,
    tokenizer=tokenizer,
    data_collator=data_collator,
)

where gaudi_config_name is the name of a model from the Hub (Gaudi configurations are stored in model repositories). You can also give the path to a custom Gaudi configuration written in a JSON file such as this one:

{
  "use_habana_mixed_precision": true,
  "hmp_is_verbose": false,
  "use_fused_adam": true,
  "use_fused_clip_norm": true,
  "hmp_bf16_ops": [
    "add",
    "addmm",
    "bmm",
    "div",
    "dropout",
    "gelu",
    "iadd",
    "linear",
    "layer_norm",
    "matmul",
    "mm",
    "rsub",
    "softmax",
    "truediv"
  ],
  "hmp_fp32_ops": [
    "embedding",
    "nll_loss",
    "log_softmax"
  ]
}

If you prefer to instantiate a Gaudi configuration to work on it before giving it to the trainer, you can do it as follows:

gaudi_config = GaudiConfig.from_pretrained(
    gaudi_config_name,
    cache_dir=model_args.cache_dir,
    revision=model_args.model_revision,
    use_auth_token=True if model_args.use_auth_token else None,
)

Diffusers Interface

You can generate images from prompts using Stable Diffusion on Gaudi using the GaudiStableDiffusionPipeline class and the [GaudiDDIMScheduler] which have been both optimized for HPUs. Here is how to use them and the differences with the 🤗 Diffusers library:

- from diffusers import DDIMScheduler, StableDiffusionPipeline
+ from optimum.habana.diffusers import GaudiDDIMScheduler, GaudiStableDiffusionPipeline


model_name = "runwayml/stable-diffusion-v1-5"

- scheduler = DDIMScheduler.from_pretrained(model_name, subfolder="scheduler")
+ scheduler = GaudiDDIMScheduler.from_pretrained(model_name, subfolder="scheduler")

- pipeline = StableDiffusionPipeline.from_pretrained(
+ pipeline = GaudiStableDiffusionPipeline.from_pretrained(
    model_name,
    scheduler=scheduler,
+   use_habana=True,
+   use_hpu_graphs=True,
+   gaudi_config="Habana/stable-diffusion",
)

outputs = generator(
    ["An image of a squirrel in Picasso style"],
    num_images_per_prompt=16,
+   batch_size=4,
)

Documentation

Check out the documentation of Optimum Habana for more advanced usage.

Validated Models

The following model architectures, tasks and device distributions have been validated for 🤗 Optimum Habana:

Architecture	Single Card	Multi Card	DeepSpeed	Tasks
BERT	✔️	✔️	✔️	text classification question answering language modeling
RoBERTa	✔️	✔️	✔️	question answering language modeling
ALBERT	✔️	✔️	✔️	question answering language modeling
DistilBERT	✔️	✔️	✔️	question answering language modeling
GPT2	✔️	✔️	✔️	language modeling
T5	✔️	✔️	✔️	summarization translation
ViT	✔️	✔️	✔️	image classification
Swin	✔️	✔️	✔️	image classification
Wav2Vec2	✔️	✔️	✔️	audio classification speech recognition
Stable Diffusion	✔️	✗	✗	text-to-image generation
CLIP	✔️	✔️	✔️	contrastive image-text training
BLOOM(Z)	✗	✗	✔️	text generation

Other models and tasks supported by the 🤗 Transformers library may also work. You can refer to this section for using them with 🤗 Optimum Habana. Besides, this page explains how to modify any example from the 🤗 Transformers library to make it work with 🤗 Optimum Habana.

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

Gaudi Setup

Please refer to Habana Gaudi's official installation guide.

Tests should be run in a Docker container based on Habana Docker images.

The current version has been validated for SynapseAI 1.9.