any params to constrain the min_lens when using beamsearch and unconstrained-training on vqa finetune and eval?

[yuezhao238]

Hi, thank you for this great work.
I'm tring to run the scripts you provide, but i encounter some questions. after using this finetune script :

#!/usr/bin/env

GPUS_PER_NODE=1
WORKER_CNT=1
export MASTER_ADDR=127.0.0.1
export MASTER_PORT=0
export RANK=0 

data_dir=../../dataset/vqa_data
data=${data_dir}/vqa_train.tsv,${data_dir}/vqa_val.tsv


restore_file=../../checkpoints/ofa_large.pt
# restore_file=./vqa_checkpoints/40000_1000_5e-5_480/checkpoint_best.pt
selected_cols=0,1,2,3 # id, image, question, answer, i set predict object to be None in code

log_dir=./vqa_logs
save_dir=./vqa_checkpoints
mkdir -p $log_dir $save_dir

bpe_dir=../../utils/BPE
user_dir=../../ofa_module

task=vqa_gen
arch=ofa_large
# arch=ofa_medium
criterion=adjust_label_smoothed_cross_entropy
label_smoothing=0.1
batch_size=8
update_freq=4
resnet_drop_path_rate=0.0
encoder_drop_path_rate=0.2
decoder_drop_path_rate=0.2
dropout=0.1
attention_dropout=0.0
max_src_length=80
max_object_length=30
max_tgt_length=30
num_bins=1000
patch_image_size=480

uses_ema="--uses-ema"
store_ema="--store-ema"
ema_fp32="--ema-fp32"
ema_decay=0.9999
ema_start_update=0

val_inference_type=beamsearch # allcand

unconstrained_training_flag="--unconstrained-training"

for total_num_updates in {40000,}; do
  echo "total_num_updates "${total_num_updates}
  for warmup_updates in {1000,}; do
    echo "warmup_updates "${warmup_updates}  
    for lr in {5e-5,}; do
      echo "lr "${lr}
      for patch_image_size in {480,}; do
        echo "patch_image_size "${patch_image_size}

        log_file=${log_dir}/${total_num_updates}"_"${warmup_updates}"_"${lr}"_"${patch_image_size}"_rank"${RANK}".log"
        save_path=${save_dir}/${total_num_updates}"_"${warmup_updates}"_"${lr}"_"${patch_image_size}
        mkdir -p $save_path
        
        python ../../train.py \
            $data \
            --selected-cols=${selected_cols} \
            --bpe-dir=${bpe_dir} \
            --user-dir=${user_dir} \
            --restore-file=${restore_file} \
            --reset-optimizer --reset-dataloader --reset-meters \
            --save-dir=${save_path} \
            --task=${task} \
            --arch=${arch} \
            --criterion=${criterion} \
            --label-smoothing=${label_smoothing} \
            --batch-size=${batch_size} \
            --update-freq=${update_freq} \
            --encoder-normalize-before \
            --decoder-normalize-before \
            --share-decoder-input-output-embed \
            --share-all-embeddings \
            --layernorm-embedding \
            --patch-layernorm-embedding \
            --code-layernorm-embedding \
            --freeze-resnet \
            --resnet-drop-path-rate=${resnet_drop_path_rate} \
            --encoder-drop-path-rate=${encoder_drop_path_rate} \
            --decoder-drop-path-rate=${decoder_drop_path_rate} \
            --dropout=${dropout} \
            --attention-dropout=${attention_dropout} \
            --weight-decay=0.01 \
            --optimizer=adam \
            --adam-betas="(0.9,0.999)" \
            --adam-eps=1e-08 \
            --clip-norm=1.0 \
            --lr-scheduler=polynomial_decay \
            --lr=${lr} \
            --total-num-update=${total_num_updates} \
            --warmup-updates=${warmup_updates} \
            --log-format=simple \
            --log-interval=10 \
            --fixed-validation-seed=7 \
            --keep-last-epochs=15 \
            --save-interval=1 --validate-interval=1 \
            --max-update=${total_num_updates} \
            --best-checkpoint-metric=vqa_score --maximize-best-checkpoint-metric \
            --max-src-length=${max_src_length} \
            --max-object-length=${max_object_length} \
            --max-tgt-length=${max_tgt_length} \
            --find-unused-parameters \
            --freeze-encoder-embedding \
            --freeze-decoder-embedding \
            ${unconstrained_training_flag} \
            --valid-batch-size=20 \
            --add-type-embedding \
            --scale-attn \
            --scale-fc \
            --scale-heads \
            --disable-entangle \
            --num-bins=${num_bins} \
            --patch-image-size=${patch_image_size} \
            --prompt-type=prev_output \
            --fp16 \
            --fp16-scale-window=512 \
            --add-object \
            ${uses_ema} \
            ${store_ema} \
            ${ema_fp32} \
            --ema-decay=${ema_decay} \
            --ema-start-update=${ema_start_update} \
            --val-inference-type=${val_inference_type} \
            --num-workers=0 > ${log_file} 2>&1
      done
    done
  done
done

i run the evaluate_vqa_unconstrained.sh, and the answer is all empty string "", the answers in my dataset usually have lengths surpass 200. what should i do to avoid ""?
i've tried to modify max_len_b and min_len in ofa_task.py; max_len_b max_len and min_len in models/sequence_generator.py and fairseq/sequence_generator.py, while these change only make finetune more time-consuming, the eval.sh is still only generate "".
Thank you for any reply!