This model was pretrained on the bookcorpus dataset using knowledge distillation.
The particularity of this model is that even though it shares the same architecture as BERT, it has a hidden size of 256 (a third of the hidden size of BERT) and 4 attention heads (hence the same head size of BERT).
The weights of the model were initialized by pruning the weights of bert-base-uncased.
A knowledge distillation was performed using multiple loss functions to fine-tune the model.
PS : the tokenizer is the same as the one of the model bert-base-uncased.
To load the model & tokenizer :
from transformers import AutoModelForMaskedLM, BertTokenizer
model_name = "eli4s/prunedBert-L12-h256-A4-finetuned"
model = AutoModelForMaskedLM.from_pretrained(model_name)
tokenizer = BertTokenizer.from_pretrained(model_name)
To use it on a sentence :
import torch
sentence = "Let's have a [MASK]."
model.eval()
inputs = tokenizer([sentence], padding='longest', return_tensors='pt')
output = model(inputs['input_ids'], attention_mask=inputs['attention_mask'])
mask_index = inputs['input_ids'].tolist()[0].index(103)
masked_token = output['logits'][0][mask_index].argmax(axis=-1)
predicted_token = tokenizer.decode(masked_token)
print(predicted_token)
Or we can also predict the n most relevant predictions :
top_n = 5
vocab_size = model.config.vocab_size
logits = output['logits'][0][mask_index].tolist()
top_tokens = sorted(list(range(vocab_size)), key=lambda i:logits[i], reverse=True)[:top_n]
tokenizer.decode(top_tokens)