xlstm
Official repository of the xLSTM.
Stars: 1287
xLSTM is a new Recurrent Neural Network architecture based on ideas of the original LSTM. Through Exponential Gating with appropriate normalization and stabilization techniques and a new Matrix Memory it overcomes the limitations of the original LSTM and shows promising performance on Language Modeling when compared to Transformers or State Space Models. The package is based on PyTorch and was tested for versions >=1.8. For the CUDA version of xLSTM, you need Compute Capability >= 8.0. The xLSTM tool provides two main components: xLSTMBlockStack for non-language applications or integrating in other architectures, and xLSTMLMModel for language modeling or other token-based applications.
README:
xLSTM is a new Recurrent Neural Network architecture based on ideas of the original LSTM. Through Exponential Gating with appropriate normalization and stabilization techniques and a new Matrix Memory it overcomes the limitations of the original LSTM and shows promising performance on Language Modeling when compared to Transformers or State Space Models.
Create a conda environment from the file environment_pt220cu121.yaml.
Install the model code only (i.e. the module xlstm) as package:
Instally via pip:
pip install xlstmClone from github:
git clone https://github.com/NX-AI/xlstm.git
cd xlstm
pip install -e .This package is based on PyTorch and was tested for versions >=1.8. For the CUDA version of sLSTM, you need Compute Capability >= 8.0, see https://developer.nvidia.com/cuda-gpus. For a well-tested environment, install the environment_pt220cu121.yaml as:
conda env create -n xlstm -f environment_pt220cu121.yaml
conda activate xlstmFor non language applications or for integrating in other architectures you can use the xLSTMBlockStack and for language modeling or other token-based applications you can use the xLSTMLMModel.
The xLSTMBLockStack is meant for use as alternative backbone in existing projects. It is similar to a stack of Transformer blocks, but uses xLSTM blocks:
import torch
from xlstm import (
xLSTMBlockStack,
xLSTMBlockStackConfig,
mLSTMBlockConfig,
mLSTMLayerConfig,
sLSTMBlockConfig,
sLSTMLayerConfig,
FeedForwardConfig,
)
cfg = xLSTMBlockStackConfig(
mlstm_block=mLSTMBlockConfig(
mlstm=mLSTMLayerConfig(
conv1d_kernel_size=4, qkv_proj_blocksize=4, num_heads=4
)
),
slstm_block=sLSTMBlockConfig(
slstm=sLSTMLayerConfig(
backend="cuda",
num_heads=4,
conv1d_kernel_size=4,
bias_init="powerlaw_blockdependent",
),
feedforward=FeedForwardConfig(proj_factor=1.3, act_fn="gelu"),
),
context_length=256,
num_blocks=7,
embedding_dim=128,
slstm_at=[1],
)
xlstm_stack = xLSTMBlockStack(cfg)
x = torch.randn(4, 256, 128).to("cuda")
xlstm_stack = xlstm_stack.to("cuda")
y = xlstm_stack(x)
y.shape == x.shapeIf you are working with yaml strings / files for configuration you can also use dacite to create the config dataclasses. This is the same as the snippet above:
from omegaconf import OmegaConf
from dacite import from_dict
from dacite import Config as DaciteConfig
from xlstm import xLSTMBlockStack, xLSTMBlockStackConfig
xlstm_cfg = """
mlstm_block:
mlstm:
conv1d_kernel_size: 4
qkv_proj_blocksize: 4
num_heads: 4
slstm_block:
slstm:
backend: cuda
num_heads: 4
conv1d_kernel_size: 4
bias_init: powerlaw_blockdependent
feedforward:
proj_factor: 1.3
act_fn: gelu
context_length: 256
num_blocks: 7
embedding_dim: 128
slstm_at: [1]
"""
cfg = OmegaConf.create(xlstm_cfg)
cfg = from_dict(data_class=xLSTMBlockStackConfig, data=OmegaConf.to_container(cfg), config=DaciteConfig(strict=True))
xlstm_stack = xLSTMBlockStack(cfg)
x = torch.randn(4, 256, 128).to("cuda")
xlstm_stack = xlstm_stack.to("cuda")
y = xlstm_stack(x)
y.shape == x.shapeThe xLSTMLMModel is a wrapper around the xLSTMBlockStack that adds the token embedding and lm head.
from omegaconf import OmegaConf
from dacite import from_dict
from dacite import Config as DaciteConfig
from xlstm import xLSTMLMModel, xLSTMLMModelConfig
xlstm_cfg = """
vocab_size: 50304
mlstm_block:
mlstm:
conv1d_kernel_size: 4
qkv_proj_blocksize: 4
num_heads: 4
slstm_block:
slstm:
backend: cuda
num_heads: 4
conv1d_kernel_size: 4
bias_init: powerlaw_blockdependent
feedforward:
proj_factor: 1.3
act_fn: gelu
context_length: 256
num_blocks: 7
embedding_dim: 128
slstm_at: [1]
"""
cfg = OmegaConf.create(xlstm_cfg)
cfg = from_dict(data_class=xLSTMLMModelConfig, data=OmegaConf.to_container(cfg), config=DaciteConfig(strict=True))
xlstm_stack = xLSTMLMModel(cfg)
x = torch.randint(0, 50304, size=(4, 256)).to("cuda")
xlstm_stack = xlstm_stack.to("cuda")
y = xlstm_stack(x)
y.shape[1:] == (256, 50304)The synthetic experiments show-casing the benefits of sLSTM over mLSTM and vice versa best are the Parity task and the Multi-Query Associative Recall task. The Parity task can only be solved with state-tracking capabilities provided by the memory-mixing of sLSTM. The Multi-Query Associative Recall task measures memorization capabilities, where the matrix-memory and state expansion of mLSTM is very beneficial. In combination they do well on both tasks.
To run each, run the main.py in the experiments folder like:
python experiments/main.py --config experiments/parity_xLSTM01.yaml # xLSTM[0:1], sLSTM only
python experiments/main.py --config experiments/parity_xLSTM10.yaml # xLSTM[1:0], mLSTM only
python experiments/main.py --config experiments/parity_xLSTM11.yaml # xLSTM[1:1], mLSTM and sLSTM
Note that the training loop does not contain early stopping or test evaluation.
If you use this codebase, or otherwise find our work valuable, please cite the xLSTM paper:
@article{xlstm,
title={xLSTM: Extended Long Short-Term Memory},
author={Beck, Maximilian and P{\"o}ppel, Korbinian and Spanring, Markus and Auer, Andreas and Prudnikova, Oleksandra and Kopp, Michael and Klambauer, G{\"u}nter and Brandstetter, Johannes and Hochreiter, Sepp},
journal={arXiv preprint arXiv:2405.04517},
year={2024}
}
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