#!/bin/bash
#PBS -N physics_sft_2gpu
#PBS -q normal
#PBS -P 11714283
#PBS -l select=1:ncpus=28:ngpus=2
#PBS -l walltime=24:00:00
#PBS -j oe
#PBS -k oe
#PBS -o checkpoints/physics-qwen25vl-sft/pbs_2gpu.out
#
# Submit from the repo root:
#   mkdir -p checkpoints/physics-qwen25vl-sft
#   qsub scripts/train_sft_2gpu.pbs
# Live training log:
#   tail -f checkpoints/physics-qwen25vl-sft/train_2gpu.txt

set -euo pipefail

cd "${PBS_O_WORKDIR:?qsub this from the repo root so PBS_O_WORKDIR is set}"

CKPT_DIR="${PWD}/checkpoints/physics-qwen25vl-sft"
LOG_TXT="${CKPT_DIR}/train_2gpu.txt"
mkdir -p "${CKPT_DIR}"
touch "${LOG_TXT}"

export PYTHONPATH="${PWD}/src${PYTHONPATH:+:$PYTHONPATH}"
export HF_HOME="${HF_HOME:-$PWD/.cache/huggingface}"
export TOKENIZERS_PARALLELISM=false
export PYTHONUNBUFFERED=1

source ~/.bashrc
if [[ -n "${PHYSICS_SFT_CONDA_ENV:-}" ]]; then
  conda activate "$PHYSICS_SFT_CONDA_ENV"
elif [[ -x "$PWD/.venv/bin/python" ]]; then
  # shellcheck disable=SC1091
  source "$PWD/.venv/bin/activate"
fi

PYTHON="$(command -v python)"
{
  echo "===== job start $(date -Is) ====="
  echo "cwd=$(pwd)  python=$PYTHON  host=$(hostname)  PBS_JOBID=${PBS_JOBID:-}"
  nvidia-smi -L || true
} | tee -a "${LOG_TXT}"

# Line-buffered so tail -f updates as the job runs.
stdbuf -oL -eL "$PYTHON" -m accelerate.commands.launch --num_processes 2 \
  --config_file configs/accelerate_ddp_2gpu.yaml \
  src/physics_model/sft.py --config configs/sft_qwen25vl_7b_2gpu.yaml \
  --skip-length-scan \
  2>&1 | tee -a "${LOG_TXT}"

echo "===== job end $(date -Is) =====" | tee -a "${LOG_TXT}"