Model Verify Flagos

Verify the serving stack with a user-specified target model. Runs twice: first with FlagGems/FlagCX disabled (isolate model-specific errors), then with full multi-chip stack enabled. Diffs the two runs to pinpoint which layer caused any failure.

Target Model Verification

Same layer-peeling approach as env-verify, but with the real target model that may require multi-GPU tensor parallelism. Runs the model twice (without and with multi-chip stack) and diffs results to isolate failures.

Skill Components

model-verify/
├── SKILL.md                            # This file — execution flow
├── scripts/
│   └── diff_analysis.py                # Compare Run A vs Run B, classify errors (JSON)
└── references/
    └── multichip-errors.md             # Multi-chip error patterns and diff truth table

Reused from env-verify:

• env-verify/scripts/run_offline_inference.py — Phase A test (parameterized)
• env-verify/scripts/test_serve_mode.py — Phase B test (parameterized)
• env-verify/references/error-classification.md — Layer-based error rules

Prerequisites

• Running container with software stack installed (from install-stack)
• env-verify completed (at least Phase A passed)
• User must provide model path

If invoked standalone, ask for container name, vendor, and model path. If invoked from /flagrelease, these are passed as context.

Execution Flow

Step 1: Get Model Info from User

Ask the user for (use AskUserQuestion if not provided):

1. Model path (required) — local path inside container OR ModelScope/HuggingFace ID
2. --tensor-parallel-size (optional) — default to GPU count
3. Additional vllm args (optional)

Get default TP size:

docker exec <CONTAINER> python3 -c "
import torch; print(torch.cuda.device_count() if torch.cuda.is_available() else 1)
"

If user does not provide model path → ask and wait. Do not guess.

Step 2: Download Model (if needed)

If model path is a remote ID (not starting with /):

docker exec <CONTAINER> python3 -c "
from modelscope import snapshot_download
snapshot_download('<MODEL_ID>', local_dir='/data/models/<MODEL_NAME>')
"

If local directory, verify config.json exists:

docker exec <CONTAINER> test -f <MODEL_PATH>/config.json

Timeout: 600s for large model downloads.

Step 3: Run A — WITHOUT Multi-Chip Stack

Copy the test scripts from env-verify into the container (if not already there):

docker cp <ENV_VERIFY_DIR>/scripts/run_offline_inference.py <CONTAINER>:/tmp/
docker cp <ENV_VERIFY_DIR>/scripts/test_serve_mode.py <CONTAINER>:/tmp/

Phase A (offline):

docker exec <CONTAINER> bash -c '
export USE_FLAGGEMS=0
unset FLAGCX_PATH
timeout 300 python3 /tmp/run_offline_inference.py \
    --model <MODEL_PATH> \
    --tp <TP_SIZE> \
    --trust-remote-code
' > /tmp/run_a_offline.json

Phase B (serve):

docker exec <CONTAINER> bash -c '
export USE_FLAGGEMS=0
unset FLAGCX_PATH
timeout 360 python3 /tmp/test_serve_mode.py \
    --model <MODEL_PATH> \
    --tp <TP_SIZE> \
    --trust-remote-code \
    --health-timeout 300
' > /tmp/run_a_serve.json

Step 4: Run B — WITH Full Multi-Chip Stack

Skip logic: If ALL of FlagGems, FlagTree, FlagCX failed install → skip Run B. Report: "Run B skipped: no multi-chip packages installed." Check install-stack results to decide.

Phase A (offline):

docker exec <CONTAINER> bash -c '
export USE_FLAGGEMS=1
export FLAGCX_PATH=/tmp/FlagCX
export VLLM_PLUGINS=fl
timeout 300 python3 /tmp/run_offline_inference.py \
    --model <MODEL_PATH> \
    --tp <TP_SIZE> \
    --trust-remote-code
' > /tmp/run_b_offline.json

Phase B (serve):

docker exec <CONTAINER> bash -c '
export USE_FLAGGEMS=1
export FLAGCX_PATH=/tmp/FlagCX
export VLLM_PLUGINS=fl
timeout 360 python3 /tmp/test_serve_mode.py \
    --model <MODEL_PATH> \
    --tp <TP_SIZE> \
    --trust-remote-code \
    --health-timeout 300
' > /tmp/run_b_serve.json

Step 5: Diff Analysis

Copy and run scripts/diff_analysis.py to compare the two runs:

docker cp <SKILL_DIR>/scripts/diff_analysis.py <CONTAINER>:/tmp/
docker exec <CONTAINER> python3 /tmp/diff_analysis.py \
    --run-a /tmp/run_a_offline.json \
    --run-b /tmp/run_b_offline.json

Read references/multichip-errors.md to interpret the diff and classify errors.

Step 6: Produce Report

{
  "status": "PASS | PARTIAL | FAIL",
  "stage": "model-verify",
  "model": "<MODEL_PATH>",
  "tensor_parallel_size": 8,
  "run_a_without_multichip": {
    "flags": {"USE_FLAGGEMS": "0", "FLAGCX_PATH": "unset"},
    "phase_a_offline": "PASS | FAIL",
    "phase_b_serve": "PASS | FAIL",
    "output_sample": "...",
    "errors": []
  },
  "run_b_with_multichip": {
    "flags": {"USE_FLAGGEMS": "1", "FLAGCX_PATH": "/tmp/FlagCX"},
    "skipped": false,
    "phase_a_offline": "PASS | FAIL",
    "phase_b_serve": "PASS | FAIL",
    "output_sample": "...",
    "errors": []
  },
  "diff_analysis": {
    "conclusion": "BOTH_PASS | MULTICHIP_ERROR | SAME_ERROR | DIFFERENT_ERRORS",
    "detail": "...",
    "multichip_component": "FlagGems | FlagTree | FlagCX | plugin | null",
    "recommended_stack": "full | base | none"
  }
}

recommended_stack — tells downstream skills which stack to use:

• full — Run B passed (USE_FLAGGEMS=1, FLAGCX_PATH set)
• base — only Run A passed (USE_FLAGGEMS=0, FLAGCX_PATH unset)
• none — Run A also failed (model can't serve)

Status logic:

• PASS — both Run A and Run B succeed
• PARTIAL — Run A passes, Run B fails
• FAIL — Run A fails

Error Handling

Failure	Behavior
Model path not provided	Ask user, wait
Model path not found	Report exact path, exit with error
Model too large for memory	Report OOM, suggest reducing TP or dtype
TP > available GPUs	Report "requested TP=X but only Y available"
Server hangs	Kill after timeout, capture last logs
Run A and Run B both fail	Report both errors separately

Rule: Run BOTH runs regardless of individual failures. Maximize error coverage.

Timeout Rules

Operation	Timeout
Model download	600s
Phase A (offline)	300s
Phase B (serve + test)	360s