ProGen - (wip)

Implementation and replication of ProGen, Language Modeling for Protein Generation, in Pytorch and Jax (the weights will be made easily transferrable between the two). You can think of this as GPT for proteins sequences.

Install

$ pip install progen-transformer

Usage

from jax import random
from haiku import PRNGSequence
from progen_transformer import ProGen

model = ProGen(
    num_tokens = 256,
    dim = 512,
    seq_len = 1024,
    window_size = 256,       # local attention window size
    depth = 12,              # depth
    heads = 8,               # attention heads
    dim_head = 64,           # dimension per head
    ff_glu = True,           # use GLU in feedforward, from Noam's paper
    global_mlp_depth = 2     # last N global gmlp layers
)

rng = PRNGSequence(42)
seq = random.randint(next(rng), (1024,), 0, 256)

params = model.init(next(rng), seq)
logits = model.apply(params, next(rng), seq) # (1024, 256)

Training

Download Uniref50 from UniProt and place uniref50.fasta in the root directory

$ python generate_data.py

You should see a lot of green if everything succeeds. Then

$ python train.py

By default, the script will checkpoint and resume automatically, but if you wish to clear your progress and restart, just add a --new flag

$ python train.py --new

Model checkpoints will be saved periodically to ./ckpts

Finally, to sample from your checkpoint, just do

$ python sample.py

You can pass a prime with --prime. You can either pass the annotations, followed by #, to get the generated sequence, or pass the sequence (also followed by #) and get the generated annotations

$ python sample.py --prime "[Tax=Mammalia] #"

Mixed Precision

To use mixed precision training, you'll need to install the latest Haiku with the following command

$ pip install git+https://github.com/deepmind/dm-haiku

Then make sure to set the --mixed_precision flag when invoking the training script

$ python train.py --mixed_precision

Todo

• model parallelism with pjit
• join in GO annotations with pandas dataframe
• setup annotation -> template string system, all configuration driven, find easy way to test. offer two types of annotations, one parsed from uniref descriptions, the other from GO annotation presence
• add multiple data sources (check out trembl)
• when sampling, prime with entire sequence prior to the pound sign (intersection of sequence and annotation)
• utilize all cores when processing data
• save all training settings in the checkpoints too
• bfloat16 on xla
• resume from correct place in tfrecord even if batch size is changed inbetween runs, display number of sequences processed
• train compressed gzip tfrecords from google cloud storage path
• remove tfrecord package and just use tfrecordwriter with gzip
• generate validation tfrecords
• checkpoint and resume from a google cloud storage path
• use jinja2 for wandb html sample logging
• manage experimental tracker state, and also allow ability to turn it off by piping to noop
• add a confirmation before clearing a folder for --new run
• engineer mask in cross entropy loss so that padding can be reused as end-of-string token
• flip seq # annotation order with prob set in config
• keep N last checkpoints

Acknowledgements

Many thanks goes out to Ben Wang, who showed this type of large-scale training can be achieved with GPT-J

Citations

@misc{madani2020progen,
    title   = {ProGen: Language Modeling for Protein Generation}, 
    author  = {Ali Madani and Bryan McCann and Nikhil Naik and Nitish Shirish Keskar and Namrata Anand and Raphael R. Eguchi and Po-Ssu Huang and Richard Socher},
    year    = {2020},
    eprint  = {2004.03497},
    archivePrefix = {arXiv},
    primaryClass = {q-bio.BM}
}

@misc{su2021roformer,
    title   = {RoFormer: Enhanced Transformer with Rotary Position Embedding},
    author  = {Jianlin Su and Yu Lu and Shengfeng Pan and Bo Wen and Yunfeng Liu},
    year    = {2021},
    eprint  = {2104.09864},
    archivePrefix = {arXiv},
    primaryClass = {cs.CL}
}

@misc{shazeer2020glu,
    title   = {GLU Variants Improve Transformer},
    author  = {Noam Shazeer},
    year    = {2020},
    url     = {https://arxiv.org/abs/2002.05202}
}