Collapse null pyworker client to a single mode parameterized by --count

Now that the session model means no HTTP connection is held during the
reservation, the dichotomy between "single reserve" and "trapezoid demo"
collapses — both are "open N sessions, each held for H seconds, started
I seconds apart, close." Replace --reserve/--demo/--duration/--plateau
with --count/--hold/--interval. --session-cost becomes --cost.

Client is now 64 lines (down from 120).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

requirements.txt

@@ -1,13 +1,2 @@
-aiohttp==3.10.1
-aiodns~=3.6.0
-pycares~=4.11.0
-anyio~=4.4
-lib~=4.0
-nltk~=3.9
-psutil~=6.0
-pycryptodome~=3.20
-Requests~=2.32
-transformers~=4.52
-utils==1.0.*
-hf_transfer>=0.1.9
 vastai-sdk>=0.3.0
+nltk==3.9.4 

start_server.sh

@@ -2,10 +2,17 @@
 
 set -e -o pipefail
 
+# Check for force update flag
+FORCE_UPDATE=false
+if [ -f "/.force_update" ]; then
+    echo "Force update flag detected at /.force_update"
+    FORCE_UPDATE=true
+fi
+
 WORKSPACE_DIR="${WORKSPACE_DIR:-/workspace}"
 
 SERVER_DIR="$WORKSPACE_DIR/vast-pyworker"
-ENV_PATH="$WORKSPACE_DIR/worker-env"
+ENV_PATH="${ENV_PATH:-$WORKSPACE_DIR/worker-env}"
 DEBUG_LOG="$WORKSPACE_DIR/debug.log"
 PYWORKER_LOG="$WORKSPACE_DIR/pyworker.log"
 
@@ -47,29 +54,38 @@ JSON
 }
 
 function install_vastai_sdk() {
-    # If SDK_BRANCH is set, install vastai-sdk from the vast-sdk repo at that branch/tag/commit.
+    local uv_flags=()
+    if [ "${USE_SYSTEM_PYTHON:-}" = "true" ]; then
+        uv_flags+=(--system --break-system-packages)
+    fi
+    if [ "$FORCE_UPDATE" = true ]; then
+        uv_flags+=(--force-reinstall)
+        echo "Force reinstalling vastai"
+    fi
+
+    # If SDK_BRANCH is set, install vastai from the vast-cli repo at that branch/tag/commit.
     if [ -n "${SDK_BRANCH:-}" ]; then
         if [ -n "${SDK_VERSION:-}" ]; then
             echo "WARNING: Both SDK_BRANCH and SDK_VERSION are set; using SDK_BRANCH=${SDK_BRANCH}"
         fi
-        echo "Installing vastai-sdk from https://github.com/vast-ai/vast-sdk/ @ ${SDK_BRANCH}"
-        if ! uv pip install "vastai-sdk @ git+https://github.com/vast-ai/vast-sdk.git@${SDK_BRANCH}"; then
-            report_error_and_exit "Failed to install vastai-sdk from vast-ai/vast-sdk@${SDK_BRANCH}"
+        echo "Installing vastai from https://github.com/vast-ai/vast-cli/ @ ${SDK_BRANCH}"
+        if ! uv pip install "${uv_flags[@]}" "vastai @ git+https://github.com/vast-ai/vast-cli.git@${SDK_BRANCH}"; then
+            report_error_and_exit "Failed to install vastai from vast-ai/vast-cli@${SDK_BRANCH}"
         fi
         return 0
     fi
 
     if [ -n "${SDK_VERSION:-}" ]; then
-        echo "Installing vastai-sdk version ${SDK_VERSION}"
-        if ! uv pip install "vastai-sdk==${SDK_VERSION}"; then
-            report_error_and_exit "Failed to install vastai-sdk==${SDK_VERSION}"
+        echo "Installing vastai version ${SDK_VERSION}"
+        if ! uv pip install "${uv_flags[@]}" "vastai==${SDK_VERSION}"; then
+            report_error_and_exit "Failed to install vastai==${SDK_VERSION}"
         fi
         return 0
     fi
 
-    echo "Installing default vastai-sdk"
-    if ! uv pip install vastai-sdk; then
-        report_error_and_exit "Failed to install vastai-sdk"
+    echo "Installing default vastai"
+    if ! uv pip install "${uv_flags[@]}" vastai; then
+        report_error_and_exit "Failed to install vastai"
     fi
 }
 
@@ -90,7 +106,8 @@ echo_var DEBUG_LOG
 echo_var PYWORKER_LOG
 echo_var MODEL_LOG
 
-if [ -e "$MODEL_LOG" ]; then
+ROTATE_MODEL_LOG="${ROTATE_MODEL_LOG:-false}"
+if [ "$ROTATE_MODEL_LOG" = "true" ] && [ -e "$MODEL_LOG" ]; then
     echo "Rotating model log at $MODEL_LOG to $MODEL_LOG.old"
     if ! cat "$MODEL_LOG" >> "$MODEL_LOG.old"; then
         report_error_and_exit "Failed to rotate model log"
@@ -111,8 +128,21 @@ if ! grep -q "VAST" /etc/environment; then
     fi
 fi
 
-if [ ! -d "$ENV_PATH" ]
-then
+if [ "${USE_SYSTEM_PYTHON:-}" = "true" ]; then
+    echo "Using system Python: $(which python3)"
+    if ! which uv > /dev/null 2>&1; then
+        if ! curl -LsSf https://astral.sh/uv/install.sh | sh; then
+            report_error_and_exit "Failed to install uv package manager"
+        fi
+        if [[ -f ~/.local/bin/env ]]; then
+            if ! source ~/.local/bin/env; then
+                report_error_and_exit "Failed to source uv environment"
+            fi
+        fi
+    fi
+    install_vastai_sdk
+    touch ~/.no_auto_tmux
+elif [ ! -d "$ENV_PATH" ]; then
     echo "setting up venv"
     if ! which uv; then
         if ! curl -LsSf https://astral.sh/uv/install.sh | sh; then
@@ -131,12 +161,29 @@ then
         if ! git clone "${PYWORKER_REPO:-https://github.com/vast-ai/pyworker}" "$SERVER_DIR"; then
             report_error_and_exit "Failed to clone pyworker repository"
         fi
+    elif [ "$FORCE_UPDATE" = true ]; then
+        echo "Force updating pyworker repository"
+        if ! (cd "$SERVER_DIR" && git fetch --all); then
+            report_error_and_exit "Failed to fetch pyworker repository updates"
+        fi
     fi
     if [[ -n ${PYWORKER_REF:-} ]]; then
+        if [ "$FORCE_UPDATE" = true ]; then
+            echo "Force updating to pyworker reference: $PYWORKER_REF"
+            if ! (cd "$SERVER_DIR" && git checkout "$PYWORKER_REF" && git pull); then
+                report_error_and_exit "Failed to force update pyworker reference: $PYWORKER_REF"
+            fi
+        else
             if ! (cd "$SERVER_DIR" && git checkout "$PYWORKER_REF"); then
                 report_error_and_exit "Failed to checkout pyworker reference: $PYWORKER_REF"
             fi
         fi
+    elif [ "$FORCE_UPDATE" = true ]; then
+        echo "Force updating pyworker to latest"
+        if ! (cd "$SERVER_DIR" && git pull); then
+            report_error_and_exit "Failed to pull latest pyworker changes"
+        fi
+    fi
 
     if ! uv venv --python-preference only-managed "$ENV_PATH" -p 3.10; then
         report_error_and_exit "Failed to create virtual environment"
@@ -161,11 +208,44 @@ else
             report_error_and_exit "Failed to source uv environment"
         fi
     fi
-    if ! source "$WORKSPACE_DIR/worker-env/bin/activate"; then
+    if ! source "$ENV_PATH/bin/activate"; then
         report_error_and_exit "Failed to activate existing virtual environment"
     fi
     echo "environment activated"
     echo "venv: $VIRTUAL_ENV"
+
+    # Handle force update for existing environment
+    if [ "$FORCE_UPDATE" = true ]; then
+        echo "Performing force update on existing environment"
+
+        if [[ -d $SERVER_DIR ]]; then
+            echo "Force updating pyworker repository"
+            if ! (cd "$SERVER_DIR" && git fetch --all); then
+                report_error_and_exit "Failed to fetch pyworker repository updates"
+            fi
+
+            if [[ -n ${PYWORKER_REF:-} ]]; then
+                echo "Force updating to pyworker reference: $PYWORKER_REF"
+                if ! (cd "$SERVER_DIR" && git checkout "$PYWORKER_REF" && git pull); then
+                    report_error_and_exit "Failed to force update pyworker reference: $PYWORKER_REF"
+                fi
+            else
+                echo "Force updating pyworker to latest"
+                if ! (cd "$SERVER_DIR" && git pull); then
+                    report_error_and_exit "Failed to pull latest pyworker changes"
+                fi
+            fi
+        fi
+
+        install_vastai_sdk
+    fi
+fi
+
+# Remove force update flag after successful update
+if [ "$FORCE_UPDATE" = true ]; then
+    echo "Removing force update flag"
+    rm -f "/.force_update"
+    echo "Force update completed successfully"
 fi
 
 if [ "$USE_SSL" = true ]; then
@@ -203,16 +283,51 @@ EOF
         report_error_and_exit "Failed to generate SSL certificate request"
     fi
 
-    if ! curl --header 'Content-Type: application/octet-stream' \
+    max_retries=5
+    retry_delay=2
+    for attempt in $(seq 1 "$max_retries"); do
+        http_code=$(curl -sS -o /etc/instance.crt -w '%{http_code}' \
+            --header 'Content-Type: application/octet-stream' \
             --data-binary @/etc/instance.csr \
-        -X \
-        POST "https://console.vast.ai/api/v0/sign_cert/?instance_id=$CONTAINER_ID" > /etc/instance.crt; then
-        report_error_and_exit "Failed to sign SSL certificate"
+            -X POST "https://console.vast.ai/api/v0/sign_cert/?instance_id=$CONTAINER_ID")
+        if [ "$http_code" -ge 200 ] && [ "$http_code" -lt 300 ]; then
+            break
         fi
+        echo "SSL cert signing attempt $attempt/$max_retries failed (HTTP $http_code)"
+        if [ "$attempt" -eq "$max_retries" ]; then
+            report_error_and_exit "Failed to sign SSL certificate after $max_retries attempts (HTTP $http_code)"
+        fi
+        sleep "$retry_delay"
+        retry_delay=$((retry_delay * 2))
+    done
 fi
 
 export REPORT_ADDR WORKER_PORT USE_SSL UNSECURED
 
+# ─── SDK Deployment Mode ───────────────────────────────────────────────
+if [ "$IS_DEPLOYMENT" = "true" ]; then
+    echo "=== SDK Deployment Mode ==="
+    echo "DEPLOYMENT_ID: $DEPLOYMENT_ID"
+
+    DEPLOY_DIR="/workspace/deployment"
+    mkdir -p "$DEPLOY_DIR"
+
+    VAST_API_BASE="${VAST_API_BASE:-https://console.vast.ai}"
+
+    # Download deployment code, retrying until the blob is available on S3.
+    # The s3_key exists in the DB as soon as the deployment is created, but the
+    # actual upload may still be in flight from the client side.
+
+    # Install SDK (uses the install_vastai_sdk function which supports SDK_BRANCH/SDK_VERSION)
+    install_vastai_sdk
+    # Run deployment in serve mode
+    export VAST_DEPLOYMENT_MODE=serve
+    echo "Starting deployment: python3 $DEPLOY_DIR/deployment.py"
+    serve-vast-deployment
+    exit $?
+fi
+# ─── End SDK Deployment Mode ───────────────────────────────────────────
+
 if ! cd "$SERVER_DIR"; then
     report_error_and_exit "Failed to cd into SERVER_DIR: $SERVER_DIR"
 fi
@@ -224,19 +339,19 @@ set +e
 PY_STATUS=1
 
 if [ -f "$SERVER_DIR/worker.py" ]; then
-    echo "trying worker.py"
+    echo "Running worker.py"
     python3 -m "worker" |& tee -a "$PYWORKER_LOG"
     PY_STATUS=${PIPESTATUS[0]}
 fi
 
 if [ "${PY_STATUS}" -ne 0 ] && [ -f "$SERVER_DIR/workers/$BACKEND/worker.py" ]; then
-    echo "trying workers.${BACKEND}.worker"
+    echo "Running workers.${BACKEND}.worker"
     python3 -m "workers.${BACKEND}.worker" |& tee -a "$PYWORKER_LOG"
     PY_STATUS=${PIPESTATUS[0]}
 fi
 
 if [ "${PY_STATUS}" -ne 0 ] && [ -f "$SERVER_DIR/workers/$BACKEND/server.py" ]; then
-    echo "trying workers.${BACKEND}.server"
+    echo "Running workers.${BACKEND}.server"
     python3 -m "workers.${BACKEND}.server" |& tee -a "$PYWORKER_LOG"
     PY_STATUS=${PIPESTATUS[0]}
 fi
@@ -250,4 +365,4 @@ if [ "${PY_STATUS}" -ne 0 ]; then
     report_error_and_exit "PyWorker exited with status ${PY_STATUS}"
 fi
 
-echo "launching PyWorker server done"
+echo "PyWorker bootstrap complete"

workers/null/README.md

@@ -0,0 +1,88 @@
+# Null PyWorker
+
+Holds Vast Serverless reservations open without forwarding any work to a
+model. Use it when your real workload (a queue consumer in any language)
+runs as a separate process on the instance and you just want to drive
+Vast autoscaling: **one POST reserves a worker, one POST releases it.**
+
+## Use case
+
+You have a job queue on your own infrastructure (Redis, SQS, NATS, etc.)
+and a consumer (node, golang, python, a binary — anything) that pulls
+from it. You want one Vast worker per unit of in-flight work, scaling
+elastically from zero. The null PyWorker is the autoscaling driver; your
+consumer does the work.
+
+## How it works
+
+Reservations use the framework's session API. The SDK's
+`endpoint.session(...)` POSTs `/session/create` to reserve a worker;
+`session.close()` POSTs `/session/end` to release it. `max_sessions=1`
+means each worker holds exactly one reservation — the next reservation
+either lands on a free worker or triggers a scale-up.
+
+The PyWorker itself does nothing functional:
+
+- One trivial `/ping` route to satisfy the framework's benchmark
+  requirement (its `max_perf` is pinned to 100).
+- An internal `/release` endpoint on `127.0.0.1:18999` for the local
+  consumer to end the session without needing `session_auth`.
+
+## Endpoint parameters
+
+Tested working configuration:
+
+| Parameter | Value | Why |
+|---|---|---|
+| `target_util` | `1.0` | One session = one worker. Default `0.9` rounds up to an extra worker. |
+| `min_load` | `0` | Scale-to-zero floor. |
+| `max_queue_time` | `1` | Stop routing to an occupied worker after ~1s of implied queue. |
+| `target_queue_time` | `0.5` | Trigger scale-up promptly once anything queues. |
+| `inactivity_timeout` | `10` (seconds) | Permit scale-to-zero after 10s idle. |
+
+## API
+
+| Route | Where | Use |
+|---|---|---|
+| `POST /session/create` | endpoint, signed | Reserve a worker (`endpoint.session(...)`) |
+| `POST /session/end` | endpoint, signed | Release (`session.close()`) |
+| `POST /release` | `127.0.0.1:18999`, no auth | Local consumer release, no `session_auth` needed |
+
+## Healthcheck
+
+Default: stub on `127.0.0.1:18999/health` returning `200`. Set
+`BACKEND_HEALTH_URL=http://127.0.0.1:9090/health` (absolute URL) to point
+the framework at your queue consumer's health endpoint instead — if the
+consumer dies, the autoscaler sees the worker as broken.
+
+## Deploying
+
+1. Point `PYWORKER_REPO` at this repo (or your fork).
+2. Set `BACKEND=null` in the template.
+3. Run your queue consumer alongside the PyWorker. When it's done with
+   a unit of work:
+   ```bash
+   curl -X POST http://127.0.0.1:18999/release
+   ```
+
+## Client demo
+
+```bash
+# Single reservation, hold 180s
+python -m workers.null.client --endpoint <NAME> --instance alpha
+
+# Three concurrent reservations, started 30s apart, each held 360s
+python -m workers.null.client --endpoint <NAME> --instance alpha --count 3 --hold 360
+```
+
+Flags: `--count` (number of concurrent sessions, default 1), `--hold`
+(seconds each session is held, default 180), `--interval` (seconds
+between starts when `--count > 1`, default 30), `--cost` (cost reported
+at session-create, default 100 = `max_perf`), `--instance` (`prod` |
+`alpha` | `candidate` | `local`).
+
+## Environment variables
+
+- `BACKEND_HEALTH_URL` — absolute URL the framework healthchecks. Stub
+  is used when unset.
+- `NULL_CONTROL_PORT` — internal control server port. Defaults to `18999`.

workers/null/client.py

@@ -0,0 +1,64 @@
+import argparse
+import asyncio
+import logging
+import os
+import sys
+
+from vastai import Serverless
+
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s[%(levelname)-5s] %(message)s",
+    datefmt="%Y-%m-%d %H:%M:%S",
+)
+log = logging.getLogger(__file__)
+
+
+async def reserve(client: Serverless, endpoint_name: str, hold: float, cost: int, label: str):
+    endpoint = await client.get_endpoint(name=endpoint_name)
+    async with await endpoint.session(cost=cost, lifetime=hold + 60) as s:
+        sid = s.session_id
+        log.info("[%s] %s open, holding %.0fs", label, sid, hold)
+        await asyncio.sleep(hold)
+    log.info("[%s] %s closed", label, sid)
+
+
+async def main_async():
+    p = argparse.ArgumentParser(description="Vast Null PyWorker demo client")
+    p.add_argument("--endpoint", default=os.environ.get("VAST_ENDPOINT", "null-prod"))
+    p.add_argument("--instance", choices=("prod", "alpha", "candidate", "local"),
+                   default=os.environ.get("VAST_INSTANCE", "prod"))
+    p.add_argument("--count", type=int, default=1,
+                   help="concurrent sessions to open (default: 1)")
+    p.add_argument("--interval", type=float, default=30.0,
+                   help="seconds between session starts when count>1 (default: 30)")
+    p.add_argument("--hold", type=float, default=180.0,
+                   help="seconds to hold each session (default: 180)")
+    p.add_argument("--cost", type=int, default=100,
+                   help="cost reported at session-create (default: 100)")
+    args = p.parse_args()
+
+    print(f"endpoint={args.endpoint} instance={args.instance} "
+          f"count={args.count} hold={args.hold}s cost={args.cost}")
+
+    try:
+        async with Serverless(instance=args.instance) as client:
+            tasks = []
+            for i in range(args.count):
+                label = f"res-{i+1}" if args.count > 1 else "reservation"
+                tasks.append(asyncio.create_task(
+                    reserve(client, args.endpoint, args.hold, args.cost, label),
+                    name=label,
+                ))
+                if i + 1 < args.count:
+                    await asyncio.sleep(args.interval)
+            await asyncio.gather(*tasks, return_exceptions=True)
+    except KeyboardInterrupt:
+        log.info("Interrupted")
+    except Exception as e:
+        log.error("Error: %s", e, exc_info=True)
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    asyncio.run(main_async())

workers/null/worker.py

@@ -0,0 +1,143 @@
+import asyncio
+import logging
+import os
+from contextlib import asynccontextmanager
+from urllib.parse import urlsplit
+
+from aiohttp import web
+
+from vastai import (
+    Worker,
+    WorkerConfig,
+    HandlerConfig,
+    BenchmarkConfig,
+    LogActionConfig,
+)
+
+log = logging.getLogger(__file__)
+
+TARGET_PERF = 100.0
+BENCHMARK_SENTINEL = "__null_worker_benchmark__"
+
+INTERNAL_HOST = "127.0.0.1"
+INTERNAL_PORT = int(os.environ.get("NULL_CONTROL_PORT", 18999))
+STUB_HEALTH_PATH = "/health"
+
+BACKEND_HEALTH_URL = os.environ.get("BACKEND_HEALTH_URL", "").strip()
+if BACKEND_HEALTH_URL:
+    _p = urlsplit(BACKEND_HEALTH_URL)
+    if not _p.scheme or not _p.hostname:
+        raise ValueError(f"BACKEND_HEALTH_URL must be absolute, got: {BACKEND_HEALTH_URL!r}")
+    HEALTH_BASE_URL = f"{_p.scheme}://{_p.hostname}"
+    HEALTH_PORT = _p.port or (443 if _p.scheme == "https" else 80)
+    HEALTH_PATH = _p.path or "/"
+    USE_STUB_HEALTH = False
+else:
+    HEALTH_BASE_URL = f"http://{INTERNAL_HOST}"
+    HEALTH_PORT = INTERNAL_PORT
+    HEALTH_PATH = STUB_HEALTH_PATH
+    USE_STUB_HEALTH = True
+
+
+_backend_ref: dict = {"backend": None}
+
+
+def _build_internal_app() -> web.Application:
+    app = web.Application()
+
+    async def release_handler(_request: web.Request) -> web.Response:
+        # Closes the singleton session. Uses name-mangled __close_session
+        # to bypass the session_auth check — safe because this server is
+        # bound to 127.0.0.1, and it spares the consumer from threading
+        # session_auth through its queue.
+        backend = _backend_ref.get("backend")
+        if backend is None:
+            return web.json_response({"released": False, "reason": "backend not ready"}, status=503)
+        sids = list(backend.sessions.keys())
+        if not sids:
+            return web.json_response({"released": False, "reason": "no active session"}, status=200)
+        closed = []
+        for sid in sids:
+            try:
+                if await backend._Backend__close_session(sid):
+                    closed.append(sid)
+            except Exception as e:
+                log.warning(f"Error closing session {sid}: {e}")
+        return web.json_response({"released": bool(closed), "session_ids": closed}, status=200)
+
+    app.router.add_post("/release", release_handler)
+
+    if USE_STUB_HEALTH:
+        async def stub_health(_request: web.Request) -> web.Response:
+            return web.Response(status=200, text="ok")
+        app.router.add_get(STUB_HEALTH_PATH, stub_health)
+
+    return app
+
+
+@asynccontextmanager
+async def null_lifecycle():
+    # Pin max_throughput to TARGET_PERF exactly — the framework's
+    # __run_benchmark short-circuits to float(file_contents) if this exists.
+    try:
+        with open(".has_benchmark", "w") as fh:
+            fh.write(str(int(TARGET_PERF)))
+    except OSError as e:
+        log.warning(f"Could not pin benchmark cache: {e}")
+
+    runner = web.AppRunner(_build_internal_app())
+    await runner.setup()
+    await web.TCPSite(runner, INTERNAL_HOST, INTERNAL_PORT).start()
+
+    log.info(
+        "Null pyworker control server: http://%s:%d (POST /release%s)",
+        INTERNAL_HOST,
+        INTERNAL_PORT,
+        f", GET {STUB_HEALTH_PATH}" if USE_STUB_HEALTH else "",
+    )
+    if not USE_STUB_HEALTH:
+        log.info("Framework healthcheck → %s", BACKEND_HEALTH_URL)
+
+    try:
+        yield
+    finally:
+        await runner.cleanup()
+
+
+async def ping(**params: object) -> dict:
+    # Exists only to satisfy the framework's "at least one handler with a
+    # BenchmarkConfig" requirement. Sleep 1s on the benchmark path as a
+    # fallback in case the .has_benchmark cache pin failed; otherwise the
+    # benchmark cache short-circuits and this never runs.
+    if params.get(BENCHMARK_SENTINEL):
+        await asyncio.sleep(1.0)
+        return {"ok": True, "benchmark": True}
+    return {"ok": True}
+
+
+worker_config = WorkerConfig(
+    model_server_url=HEALTH_BASE_URL,
+    model_server_port=HEALTH_PORT,
+    model_healthcheck_url=HEALTH_PATH,
+    lifecycle=null_lifecycle(),
+    max_sessions=1,
+    handlers=[
+        HandlerConfig(
+            route="/ping",
+            allow_parallel_requests=True,
+            remote_function=ping,
+            workload_calculator=lambda _payload: TARGET_PERF,
+            benchmark_config=BenchmarkConfig(
+                generator=lambda: {BENCHMARK_SENTINEL: True},
+                runs=1,
+                concurrency=1,
+                do_warmup=False,
+            ),
+        ),
+    ],
+    log_action_config=LogActionConfig(),
+)
+
+_worker = Worker(worker_config)
+_backend_ref["backend"] = _worker.backend
+_worker.run()

workers/tgi/worker.py

@@ -35,7 +35,7 @@ def benchmark_generator() -> dict:
     benchmark_data = {
         "inputs": prompt,
         "parameters": {
-            "max_new_tokens": 128,
+            "max_new_tokens": 500,
             "temperature": 0.7,
             "return_full_text": False
         }