Add support for AdapterPlus (#746)

This PR aims to add support for AdapterPlus

Github: https://github.com/visinf/adapter_plus
Paper: https://arxiv.org/pdf/2406.06820

Integration of AdapterPlus into the `adapters` library will involve
adding new parameters/options to the `BnConfig`

Checklist of things that are added/to be added

1. New type of `scaling` called `channel`, in which we add learnable
parameters for the channel/input_size dimension
2. New type of `init_weights` called `houlsby`, where the projection
matrices $W_{down}$ and $W_{up}$ will be initialized with zero-centered
Gaussian with a standard deviation of $10^{-2}$ truncated at 2 standard
deviations, and zeros for bias
3. Support for `drop_path`, also known as stochastic depth **ONLY**
applicable for vision based tasks using residual networks - located
under a new file called `/methods/vision.py`

Author: julian-fong

.github/workflows/tests_torch.yml

@@ -63,7 +63,7 @@ jobs:
       - name: Install
         run: |
           pip install torch==2.3
-          pip install .[sklearn,testing,sentencepiece]
+          pip install .[sklearn,testing,sentencepiece,torchvision]
       - name: Test
         run: |
           make test-adapter-methods
@@ -86,7 +86,7 @@ jobs:
       - name: Install
         run: |
           pip install torch==2.3
-          pip install .[sklearn,testing,sentencepiece]
+          pip install .[sklearn,testing,sentencepiece,torchvision]
       - name: Test
         run: |
           make test-adapter-models
@@ -109,7 +109,7 @@ jobs:
       - name: Install
         run: |
           pip install torch==2.3
-          pip install .[sklearn,testing,sentencepiece]
+          pip install .[sklearn,testing,sentencepiece,torchvision]
           pip install conllu seqeval
       - name: Test Examples
         run: |

docs/classes/adapter_config.rst

@@ -34,6 +34,9 @@ Single (bottleneck) adapters
 .. autoclass:: adapters.CompacterPlusPlusConfig
     :members:
 
+.. autoclass:: adapters.AdapterPlusConfig
+    :members:
+
 Prefix Tuning
 ~~~~~~~~~~~~~~~~~~~~~~~
 

docs/methods.md

@@ -42,7 +42,7 @@ A visualization of further configuration options related to the adapter structur
 - [`DoubleSeqBnConfig`](adapters.DoubleSeqBnConfig), as proposed by [Houlsby et al. (2019)](https://arxiv.org/pdf/1902.00751.pdf) places adapter layers after both the multi-head attention and feed-forward block in each Transformer layer.
 - [`SeqBnConfig`](adapters.SeqBnConfig), as proposed by [Pfeiffer et al. (2020)](https://arxiv.org/pdf/2005.00052.pdf) places an adapter layer only after the feed-forward block in each Transformer layer.
 - [`ParBnConfig`](adapters.ParBnConfig), as proposed by [He et al. (2021)](https://arxiv.org/pdf/2110.04366.pdf) places adapter layers in parallel to the original Transformer layers.
-
+- [`AdapterPlusConfig`](adapters.AdapterPlusConfig), as proposed by [Steitz and Roth (2024)](https://arxiv.org/pdf/2406.06820) places adapter layers adapter layers after the multi-head attention and has channel wise scaling and houlsby weight initialization
 _Example_:
 ```python
 from adapters import BnConfig
@@ -56,6 +56,7 @@ _Papers:_
 * [Parameter-Efficient Transfer Learning for NLP](https://arxiv.org/pdf/1902.00751.pdf) (Houlsby et al., 2019)
 * [Simple, Scalable Adaptation for Neural Machine Translation](https://arxiv.org/pdf/1909.08478.pdf) (Bapna and Firat, 2019)
 * [AdapterFusion: Non-Destructive Task Composition for Transfer Learning](https://aclanthology.org/2021.eacl-main.39.pdf) (Pfeiffer et al., 2021)
+* [Adapters Strike Back](https://arxiv.org/pdf/2406.06820) (Steitz and Roth., 2024)
 * [AdapterHub: A Framework for Adapting Transformers](https://arxiv.org/pdf/2007.07779.pdf) (Pfeiffer et al., 2020)
 
 ## Language Adapters - Invertible Adapters

notebooks/README.md

@@ -35,3 +35,4 @@ As adapters is fully compatible with HuggingFace's Transformers, you can also us
 | [NER on Wikiann](https://github.com/Adapter-Hub/adapters/blob/main/notebooks/08_NER_Wikiann.ipynb) | Evaluating adapters on NER on the wikiann dataset | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/Adapter-Hub/adapters/blob/main/notebooks/08_NER_Wikiann.ipynb) |
 | [Finetuning Whisper with Adapters](https://github.com/Adapter-Hub/adapters/blob/main/notebooks/Adapter_Whisper_Audio_FineTuning.ipynb) | Fine Tuning Whisper using LoRA | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/Adapter-Hub/adapters/blob/main/notebooks/Adapter_Whisper_Audio_FineTuning.ipynb) |
 | [Adapter Training with ReFT](https://github.com/Adapter-Hub/adapters/blob/main/notebooks/ReFT_Adapters_Finetuning.ipynb) | Fine Tuning using ReFT Adapters | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/Adapter-Hub/adapters/blob/main/notebooks/ReFT_Adapters_Finetuning.ipynb) |
+| [ViT Fine-Tuning with AdapterPlus](https://github.com/Adapter-Hub/adapters/blob/main/notebooks/ViT_AdapterPlus_FineTuning.ipynb) | ViT Fine-Tuning with AdapterPlus | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/Adapter-Hub/adapters/blob/main/notebooks/ViT_AdapterPlus_FineTuning.ipynb) |