#!/usr/bin/env bash
# v2: drops expandable_segments (suspected slowdown), uses tighter seq lengths.
# Identical training code; only env + config differ from v1.
set -euo pipefail

cd /home/ubuntu
export TOKENIZERS_PARALLELISM=false
export TRANSFORMERS_NO_ADVISORY_WARNINGS=1
export HF_HUB_DISABLE_PROGRESS_BARS=1
unset PYTORCH_CUDA_ALLOC_CONF
mkdir -p /home/ubuntu/work/blt_pilot1

LOG=/home/ubuntu/work/blt_pilot1/run_v2.log
: > "$LOG"   # truncate so progress is unambiguous in tail

nohup python3 -u -m experiments.blt_reasoner.train \
    --config /home/ubuntu/experiments/blt_reasoner/configs/pilot_qwen15b_gsm8k.json \
    >> "$LOG" 2>&1 &
PID=$!
echo "$PID" > /home/ubuntu/work/blt_pilot1/run_v2.pid
echo "Launched BLT v2 pid=$PID log=$LOG"