CodeBERTa
CodeBERTa is a RoBERTa-like model trained on the CodeSearchNet dataset from GitHub.
Supported languages:
"go"
"java"
"javascript"
"php"
"python"
"ruby"
The tokenizer is a Byte-level BPE tokenizer trained on the corpus using Hugging Face tokenizers.
Because it is trained on a corpus of code (vs. natural language), it encodes the corpus efficiently (the sequences are between 33% to 50% shorter, compared to the same corpus tokenized by gpt2/roberta).
The (small) model is a 6-layer, 84M parameters, RoBERTa-like Transformer model – that’s the same number of layers & heads as DistilBERT – initialized from the default initialization settings and trained from scratch on the full corpus (~2M functions) for 5 epochs.
Tensorboard for this training ⤵️
Quick start: masked language modeling prediction
PHP_CODE = """
public static <mask> set(string $key, $value) {
if (!in_array($key, self::$allowedKeys)) {
throw new \InvalidArgumentException('Invalid key given');
}
self::$storedValues[$key] = $value;
}
""".lstrip()
Does the model know how to complete simple PHP code?
from transformers import pipeline
fill_mask = pipeline(
"fill-mask",
model="huggingface/CodeBERTa-small-v1",
tokenizer="huggingface/CodeBERTa-small-v1"
)
fill_mask(PHP_CODE)
## Top 5 predictions:
#
' function' # prob 0.9999827146530151
'function' #
' void' #
' def' #
' final' #
Yes! That was easy 🎉 What about some Python (warning: this is going to be meta)
PYTHON_CODE = """
def pipeline(
task: str,
model: Optional = None,
framework: Optional[<mask>] = None,
**kwargs
) -> Pipeline:
pass
""".lstrip()
Results:
'framework', 'Framework', ' framework', 'None', 'str'
This program can auto-complete itself! 😱
Just for fun, let's try to mask natural language (not code):
fill_mask("My name is <mask>.")
# {'sequence': '<s> My name is undefined.</s>', 'score': 0.2548016905784607, 'token': 3353}
# {'sequence': '<s> My name is required.</s>', 'score': 0.07290805131196976, 'token': 2371}
# {'sequence': '<s> My name is null.</s>', 'score': 0.06323737651109695, 'token': 469}
# {'sequence': '<s> My name is name.</s>', 'score': 0.021919190883636475, 'token': 652}
# {'sequence': '<s> My name is disabled.</s>', 'score': 0.019681859761476517, 'token': 7434}
This (kind of) works because code contains comments (which contain natural language).
Of course, the most frequent name for a Computer scientist must be undefined 🤓.
Downstream task: programming language identification
See the model card for huggingface/CodeBERTa-language-id 🤯.
CodeSearchNet citation
@article{husain_codesearchnet_2019,
title = {{CodeSearchNet} {Challenge}: {Evaluating} the {State} of {Semantic} {Code} {Search}},
shorttitle = {{CodeSearchNet} {Challenge}},
url = {http://arxiv.org/abs/1909.09436},
urldate = {2020-03-12},
journal = {arXiv:1909.09436 [cs, stat]},
author = {Husain, Hamel and Wu, Ho-Hsiang and Gazit, Tiferet and Allamanis, Miltiadis and Brockschmidt, Marc},
month = sep,
year = {2019},
note = {arXiv: 1909.09436},
}