memorizing transformers pytorch
0.4.1
Pytorch での Memorizing Transformers (ICLR 2022) の実装 (近似最近傍を使用したメモリのインデックス作成と取得でアテンション ネットが強化)
このリポジトリは論文からわずかに逸脱しており、(シグモイド ゲートのセットアップではなく) ローカルと遠隔の注意ロジットにわたるハイブリッド アテンションを使用しています。また、KNN アテンション層にコサイン類似性アテンション (学習した温度を使用) を使用します。
$ pip install memorizing-transformers-pytorch import torch
from memorizing_transformers_pytorch import MemorizingTransformer
model = MemorizingTransformer (
num_tokens = 20000 , # number of tokens
dim = 512 , # dimension
dim_head = 64 , # dimension per attention head
depth = 8 , # number of layers
memorizing_layers = ( 4 , 5 ), # which layers to have ANN memories
max_knn_memories = 64000 , # maximum ANN memories to keep (once it hits this capacity, it will be reset for now, due to limitations in faiss' ability to remove entries)
num_retrieved_memories = 32 , # number of ANN memories to retrieve
clear_memories_on_sos_token_id = 1 , # clear passed in ANN memories automatically for batch indices which contain this specified SOS token id - otherwise, you can also manually iterate through the ANN memories and clear the indices before the next iteration
)
data = torch . randint ( 0 , 20000 , ( 2 , 1024 )) # mock data
knn_memories = model . create_knn_memories ( batch_size = 2 ) # create collection of KNN memories with the correct batch size (2 in example)
logits = model ( data , knn_memories = knn_memories ) # (1, 1024, 20000) add_knn_memory on forward をFalseに設定することで、KNN メモリを読み取り専用にできます。
元。
logits = model ( data , knn_memories = knn_memories , add_knn_memory = False ) # knn memories will not be updatedTransformer-XL メモリあり (破棄されるメモリのみが KNN メモリに追加されます)
import torch
from memorizing_transformers_pytorch import MemorizingTransformer
model = MemorizingTransformer (
num_tokens = 20000 ,
dim = 512 ,
depth = 8 ,
memorizing_layers = ( 4 , 5 ),
max_knn_memories = 64000 ,
num_retrieved_memories = 32 ,
clear_memories_on_sos_token_id = 1 ,
xl_memory_layers = ( 2 , 3 , 4 , 5 ), # xl memory layers - (https://arxiv.org/abs/2007.03356 shows you do not need XL memory on all layers, just the latter ones) - if a KNNAttention layer ends up using XL memories, only the XL memories that will be discarded will be added to long term memory
xl_max_memories = 512 , # number of xl memories to keep
shift_knn_memories_down = 1 , # let a layer look at the KNN memories this number of layers above
shift_xl_memories_down = 1 , # let a layer look at the XL memories this number of layers above, shown to enhance receptive field in ernie-doc paper
)
data = torch . randint ( 0 , 20000 , ( 2 , 1024 )) # mock data
xl_memories = None
with model . knn_memories_context ( batch_size = 2 ) as knn_memories :
logits1 , xl_memories = model ( data , knn_memories = knn_memories , xl_memories = xl_memories )
logits2 , xl_memories = model ( data , knn_memories = knn_memories , xl_memories = xl_memories )
logits3 , xl_memories = model ( data , knn_memories = knn_memories , xl_memories = xl_memories )
# ... and so on このリポジトリには、キー/値を自動的に保存および取得できる Faiss のラッパーが含まれています
import torch
from memorizing_transformers_pytorch import KNNMemory
memory = KNNMemory (
dim = 64 , # dimension of key / values
max_memories = 64000 , # maximum number of memories to keep (will throw out the oldest memories for now if it overfills)
num_indices = 2 # this should be equivalent to batch dimension, as each batch keeps track of its own memories, expiring when it sees a new document
)
memory . add ( torch . randn ( 2 , 512 , 2 , 64 )) # (batch, seq, key | value, feature dim)
memory . add ( torch . randn ( 2 , 512 , 2 , 64 ))
memory . clear ([ 0 ]) # clear batch 0, if it saw an <sos>
memory . add ( torch . randn ( 2 , 512 , 2 , 64 ))
memory . add ( torch . randn ( 2 , 512 , 2 , 64 ))
key_values , mask = memory . search ( torch . randn ( 2 , 512 , 64 ), topk = 32 )Enwik8 トレーニング
$ python train.py @article { wu2022memorizing ,
title = { Memorizing transformers } ,
author = { Wu, Yuhuai and Rabe, Markus N and Hutchins, DeLesley and Szegedy, Christian } ,
journal = { arXiv preprint arXiv:2203.08913 } ,
year = { 2022 }
} @article { Shazeer2019FastTD ,
title = { Fast Transformer Decoding: One Write-Head is All You Need } ,
author = { Noam M. Shazeer } ,
journal = { ArXiv } ,
year = { 2019 } ,
volume = { abs/1911.02150 }
} @Article { AlphaFold2021 ,
author = { Jumper, John and Evans, Richard and Pritzel, Alexander and Green, Tim and Figurnov, Michael and Ronneberger, Olaf and Tunyasuvunakool, Kathryn and Bates, Russ and {v{Z}}{'i}dek, Augustin and Potapenko, Anna and Bridgland, Alex and Meyer, Clemens and Kohl, Simon A A and Ballard, Andrew J and Cowie, Andrew and Romera-Paredes, Bernardino and Nikolov, Stanislav and Jain, Rishub and Adler, Jonas and Back, Trevor and Petersen, Stig and Reiman, David and Clancy, Ellen and Zielinski, Michal and Steinegger, Martin and Pacholska, Michalina and Berghammer, Tamas and Bodenstein, Sebastian and Silver, David and Vinyals, Oriol and Senior, Andrew W and Kavukcuoglu, Koray and Kohli, Pushmeet and Hassabis, Demis } ,
journal = { Nature } ,
title = { Highly accurate protein structure prediction with {AlphaFold} } ,
year = { 2021 } ,
doi = { 10.1038/s41586-021-03819-2 } ,
note = { (Accelerated article preview) } ,
} @inproceedings { Rae2020DoTN ,
title = { Do Transformers Need Deep Long-Range Memory? } ,
author = { Jack W. Rae and Ali Razavi } ,
booktitle = { ACL } ,
year = { 2020 }
} @misc { ding2021erniedoc ,
title = { ERNIE-Doc: A Retrospective Long-Document Modeling Transformer } ,
author = { Siyu Ding and Junyuan Shang and Shuohuan Wang and Yu Sun and Hao Tian and Hua Wu and Haifeng Wang } ,
year = { 2021 } ,
eprint = { 2012.15688 } ,
archivePrefix = { arXiv } ,
primaryClass = { cs.CL }
} @misc { henry2020querykey ,
title = { Query-Key Normalization for Transformers } ,
author = { Alex Henry and Prudhvi Raj Dachapally and Shubham Pawar and Yuxuan Chen } ,
year = { 2020 } ,
eprint = { 2010.04245 } ,
archivePrefix = { arXiv } ,
primaryClass = { cs.CL }
}記憶は時間を超えた注意である- アレックス・グレイブス
