ktrapeznikov/scibert_scivocab_uncased_squad_v2

Model

allenai/scibert_scivocab_uncased fine-tuned on SQuAD V2 using run_squad.py

Training Parameters

Trained on 4 NVIDIA GeForce RTX 2080 Ti 11Gb

BASE_MODEL=allenai/scibert_scivocab_uncased
python run_squad.py \
  --version_2_with_negative \
  --model_type albert \
  --model_name_or_path $BASE_MODEL \
  --output_dir $OUTPUT_MODEL \
  --do_eval \
  --do_lower_case \
  --train_file $SQUAD_DIR/train-v2.0.json \
  --predict_file $SQUAD_DIR/dev-v2.0.json \
  --per_gpu_train_batch_size 18 \
  --per_gpu_eval_batch_size 64 \
  --learning_rate 3e-5 \
  --num_train_epochs 3.0 \
  --max_seq_length 384 \
  --doc_stride 128 \
  --save_steps 2000 \
  --threads 24 \
  --warmup_steps 550 \
  --gradient_accumulation_steps 1 \
  --fp16 \
  --logging_steps 50 \
  --do_train

Evaluation

Evaluation on the dev set. I did not sweep for best threshold.

	val
exact	75.07790785816559
f1	78.47735207283013
total	11873.0
HasAns_exact	70.76585695006747
HasAns_f1	77.57449412292718
HasAns_total	5928.0
NoAns_exact	79.37762825904122
NoAns_f1	79.37762825904122
NoAns_total	5945.0
best_exact	75.08633032931863
best_exact_thresh	0.0
best_f1	78.48577454398324
best_f1_thresh	0.0

Usage

See huggingface documentation. Training on SQuAD V2 allows the model to score if a paragraph contains an answer:

start_scores, end_scores = model(input_ids) 
span_scores = start_scores.softmax(dim=1).log()[:,:,None] + end_scores.softmax(dim=1).log()[:,None,:]
ignore_score = span_scores[:,0,0] #no answer scores