complexa-sweep

name	complexa-sweep
description	Use this skill whenever the user wants to run a parameter sweep over a Proteina-Complexa design pipeline — cartesian-product hyperparameter scans, Pareto search over generation/reward/evaluation knobs, or any "compare configurations" workflow. Trigger phrases include "sweep beam width", "sweep nsteps", "hyperparameter sweep", "parameter scan", "scan beam_width and temperature", "compare configurations", "find the best generation params", "what's the optimal nsteps", "Pareto search for binder quality vs wall-clock", "complexa sweep", "tune Complexa", "ablate the reward weights", "configs/sweeps", "--sweeper", "run beam_width.yaml". This is the only skill that owns sweeper YAML authoring, cartesian-product expansion, and per-config result ranking.
allowed-tools	Bash, Read, Write, AskUserQuestion

complexa-sweep

Run cartesian-product parameter sweeps over Proteina-Complexa design pipelines. Pick or author a sweeper YAML in configs/sweeps/, expand it to N inference configs with script_utils/generate_inference_configs.py, loop complexa design over those configs, then aggregate per-config success metrics into a ranked summary CSV plus a manifest.

Important: The complexa design CLI does NOT accept --sweeper directly. Sweeps are driven by script_utils/generate_inference_configs.py, which writes one configs/inference_configs/inf_{idx}_{run_name}.yaml per sweep combination. You then loop complexa design over those generated configs.

What this skill enables

• Pick an existing sweeper YAML from configs/sweeps/ (beam_width, bb_ca_temperature, search_replicas, example).
• Author a new sweeper YAML with arbitrary dot-notation axes (cartesian product).
• Generate N inference + evaluation config pairs with script_utils/generate_inference_configs.py.
• Loop complexa design over the generated configs (one at a time on a single GPU, or in parallel on a multi-GPU host by sharding the config list across CUDA_VISIBLE_DEVICES).
• Walk per-config output directories and parse the analyze-step CSV from each.
• Emit sweep_summary.csv (one row per config: axis values + success rate + mean iPAE + diversity) and sweep_manifest.json.
• Identify the best config by success rate and the Pareto frontier (wall-clock vs success).

Step 1: Pre-flight

bash .claude/skills/_shared/scripts/preflight.sh

Read ./complexa_setup/preflight.json. A sweep multiplies GPU time by the number of configs. Before launching, confirm the cost with the user:

"This sweep produces N configs × ~M minutes per config ≈ TOTAL GPU-hours. OK to proceed? (y / reduce / cancel)"

If gpu.available=false, stop — sweeps are not feasible on CPU.

Step 2: Pick the pipeline + target

Use the same dialogue as complexa-design — do not duplicate it here. See .claude/skills/complexa-design/SKILL.md Step 2 ("Pick the pipeline") and Step 3 ("Gather parameters"). Capture:

• pipeline_config_name — e.g. search_binder_local_pipeline (default), search_ligand_binder_local_pipeline, search_ame_local_pipeline.
• task_name — e.g. 02_PDL1, 22_DerF21, 39_7V11_LIGAND. Passed as --override generation.task_name=<task>.
• run_name — short tag for output dir naming.

Step 3: Pick or author the sweeper YAML

Sweeper YAMLs live in configs/sweeps/. Each key is a dot-notation Hydra path; each value is a list. The cartesian product becomes N configs.

Canned sweepers

File	Axis	Values	Configs
configs/sweeps/beam_width.yaml	generation.search.beam_search.beam_width	1, 2, 4, 8	4
configs/sweeps/bb_ca_temperature.yaml	generation.model.bb_ca.simulation_step_params.sc_scale_noise	0.1, 0.4	2
configs/sweeps/search_replicas.yaml	generation.search.best_of_n.replicas	1, 4, 16, 64	4
configs/sweeps/example.yaml	beam_width × nsteps	(2,4) × (200,400)	4

If one matches the user's intent, use it as-is. Otherwise author a new file.

Authoring a new sweeper

Minimal multi-axis example (saved to configs/sweeps/my_sweep.yaml):

# 3 beam widths × 2 nsteps = 6 configs
generation.search.beam_search.beam_width:
  - 2
  - 4
  - 8

generation.args.nsteps:
  - 200
  - 400

Rules (from script_utils/generate_inference_configs.py:load_sweeper_file):

• Top-level mapping only. Keys are dot-notation Hydra paths.
• Values must be lists. A scalar is auto-wrapped into a single-element list (which pins a value without adding a dimension).
• Cartesian product: total configs = product of list lengths. Two 4-value axes = 16 configs; budget accordingly.
• If a key appears in both the sweeper file and an --override, the override wins and that axis collapses.

See reference/sweep_axes.md for the full catalogue of swept keys (typical ranges, cost multipliers, what improves/regresses).

Dry-run preview before generating

Always confirm the config count first:

python script_utils/generate_inference_configs.py \
    --config_name search_binder_local_pipeline \
    --sweeper configs/sweeps/my_sweep.yaml \
    --override generation.task_name=22_DerF21 \
    --run_name my_sweep \
    --dryrun

The output lists every axis + value list and prints DRY RUN — would generate N config pair(s).

Step 4: Generate configs + loop complexa design

Once the dry-run looks right, drop --dryrun to materialize inf_{idx}_{run_name}.yaml + eval_{idx}_{run_name}.yaml pairs under configs/inference_configs/ and configs/eval_configs/. Then loop complexa design over the inference configs.

# 1. Generate one inf_*.yaml + one eval_*.yaml per combination.
python script_utils/generate_inference_configs.py \
    --config_name search_binder_local_pipeline \
    --sweeper configs/sweeps/my_sweep.yaml \
    --override generation.task_name=22_DerF21 \
    --run_name my_sweep

# 2. Loop complexa design over each generated inference config.
for cfg in configs/inference_configs/inf_*_my_sweep.yaml; do
    complexa design "$cfg" || echo "FAILED: $cfg"
done

This serialises the sweep on a single GPU — be honest with the user that wall-clock = N × per-run.

Multi-GPU host (optional speed-up)

On a host with K GPUs, shard the config list K ways and launch one loop per GPU in parallel. Each complexa design call uses exactly one GPU at default gen_njobs=1 / eval_njobs=1, so pinning via CUDA_VISIBLE_DEVICES keeps them from colliding:

CONFIGS=(configs/inference_configs/inf_*_my_sweep.yaml)
N=${#CONFIGS[@]}; K=4   # 4 GPUs
for gpu in $(seq 0 $((K-1))); do
    (
        for i in $(seq $gpu $K $((N-1))); do
            CUDA_VISIBLE_DEVICES=$gpu complexa design "${CONFIGS[$i]}" \
                || echo "FAILED on GPU $gpu: ${CONFIGS[$i]}"
        done
    ) &
done
wait

Drop gen_njobs / eval_njobs overrides into the loop only if you intentionally want each complexa design invocation to consume multiple GPUs (and you have a way to keep them out of each other's way).

Step 5: Collect results

Each swept config writes to its own ./inference/inf_{idx}_{run_name}/ directory; the analyze step writes ./evaluation_results/eval_{idx}_{run_name}/results_*.csv. After the sweep finishes:

ls -d ./inference/inf_*_my_sweep/
ls ./evaluation_results/eval_*_my_sweep/results_*.csv

For each config, parse the analyze CSV (one row per generated binder). Standard columns used for ranking: i_pae, i_plddt, sc_rmsd, binder_seq, passes_filter (bool). If passes_filter is missing, derive a success flag with the user's chosen thresholds (defaults: i_pae < 10, i_plddt > 0.7, sc_rmsd < 2.0 — confirm with user).

Step 6: Rank configs

Emit sweep_summary.csv to the run directory. One row per config:

Column	How to compute
config_id	The {idx} from inf_{idx}_{run_name}
<axis_1>, <axis_2>, ...	The swept value at this combination (read from the per-config inf_*.yaml)
n_samples	Row count in the analyze CSV
success_rate	passes_filter.mean()
mean_i_pae	i_pae.mean() (lower = better)
mean_i_plddt	i_plddt.mean() (higher = better)
diversity_score	Unique sequence count / n_samples (or use TM-score clustering if available)
wall_clock_min	From the per-config log timestamps

Then report:

• Best config = argmax of success_rate. Tie-break on mean_i_pae (lower).
• Pareto frontier over (wall_clock_min, success_rate): a config is on the frontier iff no other config is both faster AND has higher success rate.

Print the best config + the frontier to the terminal. Save the full table to sweep_summary.csv.

Step 7: Emit manifest

Capture the resolved invocation + outputs for replay. The shared helper takes a single --output-dir (it walks for CSVs and pulls the Hydra config from the run's .hydra/), so call it against the best-config's evaluation directory and pass the parent complexa design command for that run:

BEST_ID=4   # from Step 6 ranking
python3 .claude/skills/_shared/scripts/write_manifest.py \
    --output-dir ./evaluation_results/eval_${BEST_ID}_my_sweep \
    --command "python script_utils/generate_inference_configs.py --config_name search_binder_local_pipeline --sweeper configs/sweeps/my_sweep.yaml --override generation.task_name=22_DerF21 --run_name my_sweep && for cfg in configs/inference_configs/inf_*_my_sweep.yaml; do complexa design \"\$cfg\"; done" \
    --skill complexa-sweep \
    --out ./sweep_runs/my_sweep/sweep_manifest.json

Alongside the manifest, save the ranked sweep_summary.csv from Step 6 to ./sweep_runs/my_sweep/sweep_summary.csv and surface both paths to the user.

Recommended sweep recipes

Symptom	Sweep this	Why
Quality not good enough	beam_width × nsteps (use example.yaml as a starting point)	Both raise compute → quality; find the cheapest combination that lands.
Too slow / want speed-up	nsteps downward (e.g. [100, 200, 400]) with fixed beam_width=4	Find the smallest nsteps that retains success rate.
Mode collapse / low diversity	generation.model.bb_ca.simulation_step_params.sc_scale_noise (use bb_ca_temperature.yaml)	Higher noise → more diverse backbones.
Reward over-fitting (high reward, bad metrics)	generation.reward_model.reward_models.af2folding.reward_weights.{i_pae, plddt} ratio	Re-balance composite reward.
Want statistical robustness on one config	search_replicas.yaml (best_of_n.replicas)	Same config, more samples → tighter success-rate estimate.
Algorithm shoot-out	generation.search.algorithm over [single-pass, best-of-n, beam-search, fk-steering]	Compare search regimes; pin everything else.

Hardware

Total GPU-time for a sweep = N_configs × per_run_GPU_time. A single search_binder_local_pipeline run on one A100 is roughly 30–90 min (binder length + nsteps dependent). A 4-axis × 4-value sweep = 256 configs × ~60 min = ~256 GPU-hours — at that scale, plan on a multi-GPU host with the Step-4 sharding pattern.

Refer to .claude/skills/_shared/reference/hardware.md for the per-run baseline + VRAM minima.

Troubleshooting

Symptom	Cause	Fix
Sweeper file not found from generate_inference_configs.py	Path resolved from wrong CWD	Use a path relative to the repo root; or pass an absolute path.
Sweeper YAML must be a mapping	Top-level YAML is a list or scalar	Rewrite as key: [v1, v2] mapping.
No configs were generated	One of the value lists is empty []	Sweeper file has a key: [] line — add at least one value.
complexa design rejects --sweeper	Confusion between entrypoints	The CLI does not accept --sweeper. Use generate_inference_configs.py first, then loop complexa design over the generated configs.
Override silently collapses a sweep axis	--override key=v shadowed a sweep key	Drop either the override OR the matching key from the sweeper file.
One config in the loop fails, sweep keeps going	The || echo "FAILED…" in Step 4 swallows the error	Re-run the failed inf_*.yaml standalone; check the per-config log under ./logs/. Skip failed config_id when ranking.

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For per-axis reference (typical ranges, cost, what gets better/worse), see reference/sweep_axes.md.

For the user-facing sweep system overview (config generation, output layout), see docs/SWEEP.md.