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"""Abstract Scheduler class."""
import asyncio
import base64
import copy
import logging
import os
import socket
import threading
import time
import traceback
from abc import ABC, abstractmethod
from dataclasses import dataclass
from enum import Enum
from typing import TYPE_CHECKING, Any, Dict, Iterator, List, Optional, Tuple, Union
import click
import yaml
import wandb
from wandb.errors import CommError
from wandb.sdk.launch._launch_add import launch_add
from wandb.sdk.launch.errors import LaunchError
from wandb.sdk.launch.sweeps import SchedulerError
from wandb.sdk.launch.sweeps.utils import (
create_sweep_command_args,
make_launch_sweep_entrypoint,
)
from wandb.sdk.launch.utils import (
event_loop_thread_exec,
strip_resource_args_and_template_vars,
)
from wandb.sdk.lib.runid import generate_id
if TYPE_CHECKING:
import wandb.apis.public as public
from wandb.apis.internal import Api
from wandb.apis.public import QueuedRun, Run
from wandb.sdk.wandb_run import Run as SdkRun
_logger = logging.getLogger(__name__)
LOG_PREFIX = f"{click.style('sched:', fg='cyan')} "
DEFAULT_POLLING_SLEEP = 5.0
class SchedulerState(Enum):
PENDING = 0
STARTING = 1
RUNNING = 2
FLUSH_RUNS = 3
COMPLETED = 4
FAILED = 5
STOPPED = 6
CANCELLED = 7
class RunState(Enum):
RUNNING = "running", "alive"
PENDING = "pending", "alive"
PREEMPTING = "preempting", "alive"
CRASHED = "crashed", "dead"
FAILED = "failed", "dead"
KILLED = "killed", "dead"
FINISHED = "finished", "dead"
PREEMPTED = "preempted", "dead"
# unknown when api.get_run_state fails or returns unexpected state
# assumed alive, unless we get unknown 2x then move to failed (dead)
UNKNOWN = "unknown", "alive"
def __new__(cls: Any, *args: List, **kwds: Any) -> "RunState":
obj: RunState = object.__new__(cls)
obj._value_ = args[0]
return obj
def __init__(self, _: str, life: str = "unknown") -> None:
self._life = life
@property
def is_alive(self) -> bool:
return self._life == "alive"
@dataclass
class _Worker:
agent_config: Dict[str, Any]
agent_id: str
@dataclass
class SweepRun:
id: str
worker_id: int
state: RunState = RunState.RUNNING
queued_run: Optional["public.QueuedRun"] = None
args: Optional[Dict[str, Any]] = None
logs: Optional[List[str]] = None
class Scheduler(ABC):
"""A controller/agent that populates a Launch RunQueue from a hyperparameter sweep."""
PLACEHOLDER_URI = "placeholder-uri-scheduler"
SWEEP_JOB_TYPE = "sweep-controller"
ENTRYPOINT = ["wandb", "scheduler", "WANDB_SWEEP_ID"]
def __init__(
self,
api: "Api",
*args: Optional[Any],
polling_sleep: Optional[float] = None,
sweep_id: Optional[str] = None,
entity: Optional[str] = None,
project: Optional[str] = None,
project_queue: Optional[str] = None,
num_workers: Optional[Union[int, str]] = None,
**kwargs: Optional[Any],
):
from wandb.apis.public import Api as PublicApi
self._api = api
self._public_api = PublicApi()
self._entity = (
entity
or os.environ.get("WANDB_ENTITY")
or api.settings("entity")
or api.default_entity
)
self._project = (
project or os.environ.get("WANDB_PROJECT") or api.settings("project")
)
self._sweep_id: str = sweep_id or "empty-sweep-id"
self._state: SchedulerState = SchedulerState.PENDING
# Make sure the provided sweep_id corresponds to a valid sweep
try:
resp = self._api.sweep(
sweep_id, "{}", entity=self._entity, project=self._project
)
if resp.get("state") == SchedulerState.CANCELLED.name:
self._state = SchedulerState.CANCELLED
self._sweep_config = yaml.safe_load(resp["config"])
self._num_runs_launched: int = self._get_num_runs_launched(resp["runs"])
if self._num_runs_launched > 0:
wandb.termlog(
f"{LOG_PREFIX}Found {self._num_runs_launched} previous valid runs for sweep {self._sweep_id}"
)
except Exception as e:
raise SchedulerError(
f"{LOG_PREFIX}Exception when finding sweep ({sweep_id}) {e}"
)
# Scheduler may receive additional kwargs which will be piped into the launch command
self._kwargs: Dict[str, Any] = kwargs
# Dictionary of the runs being managed by the scheduler
self._runs: Dict[str, SweepRun] = {}
# Threading lock to ensure thread-safe access to the runs dictionary
self._threading_lock: threading.Lock = threading.Lock()
self._polling_sleep = (
polling_sleep if polling_sleep is not None else DEFAULT_POLLING_SLEEP
)
self._project_queue = project_queue
# Optionally run multiple workers in (pseudo-)parallel. Workers do not
# actually run training workloads, they simply send heartbeat messages
# (emulating a real agent) and add new runs to the launch queue. The
# launch agent is the one that actually runs the training workloads.
self._workers: Dict[int, _Worker] = {}
# Init wandb scheduler run
self._wandb_run = self._init_wandb_run()
# Grab params from scheduler wandb run config
num_workers = num_workers or self._wandb_run.config.get("scheduler", {}).get(
"num_workers"
)
self._num_workers = int(num_workers) if str(num_workers).isdigit() else 8
self._settings_config: Dict[str, Any] = self._wandb_run.config.get(
"settings", {}
)
@abstractmethod
def _get_next_sweep_run(self, worker_id: int) -> Optional[SweepRun]:
"""Called when worker available."""
@abstractmethod
def _poll(self) -> None:
"""Called every polling loop."""
@abstractmethod
def _exit(self) -> None:
pass
@abstractmethod
def _load_state(self) -> None:
pass
@abstractmethod
def _save_state(self) -> None:
pass
@property
def state(self) -> SchedulerState:
_logger.debug(f"{LOG_PREFIX}Scheduler state is {self._state.name}")
return self._state
@state.setter
def state(self, value: SchedulerState) -> None:
_logger.debug(f"{LOG_PREFIX}Scheduler was {self.state.name} is {value.name}")
self._state = value
@property
def is_alive(self) -> bool:
if self.state in [
SchedulerState.COMPLETED,
SchedulerState.FAILED,
SchedulerState.STOPPED,
SchedulerState.CANCELLED,
]:
return False
return True
@property
def at_runcap(self) -> bool:
"""False if under user-specified cap on # of runs."""
run_cap = self._sweep_config.get("run_cap")
if not run_cap:
return False
at_runcap: bool = self._num_runs_launched >= run_cap
return at_runcap
@property
def num_active_runs(self) -> int:
return len(self._runs)
@property
def busy_workers(self) -> Dict[int, _Worker]:
"""Returns dict of id:worker already assigned to a launch run.
runs should always have a worker_id, but are created before
workers are assigned to the run
"""
busy_workers = {}
for _, r in self._yield_runs():
busy_workers[r.worker_id] = self._workers[r.worker_id]
return busy_workers
@property
def available_workers(self) -> Dict[int, _Worker]:
"""Returns dict of id:worker ready to launch another run."""
if len(self._workers) == 0:
return {}
return {
_id: w for _id, w in self._workers.items() if _id not in self.busy_workers
}
def _init_wandb_run(self) -> "SdkRun":
"""Controls resume or init logic for a scheduler wandb run."""
settings = wandb.Settings(disable_job_creation=True)
run: SdkRun = wandb.init( # type: ignore
name=f"Scheduler.{self._sweep_id}",
resume="allow",
config=self._kwargs, # when run as a job, this sets config
settings=settings,
)
return run
def stop_sweep(self) -> None:
"""Stop the sweep."""
self._state = SchedulerState.STOPPED
def fail_sweep(self, err: Optional[str]) -> None:
"""Fail the sweep w/ optional exception."""
self._state = SchedulerState.FAILED
if err:
raise SchedulerError(err)
def start(self) -> None:
"""Start a scheduler, confirms prerequisites, begins execution loop."""
wandb.termlog(f"{LOG_PREFIX}Scheduler starting.")
if not self.is_alive:
wandb.termerror(
f"{LOG_PREFIX}Sweep already in end state ({self.state.name.lower()}). Exiting..."
)
self.exit()
return
self._state = SchedulerState.STARTING
if not self._try_load_executable():
wandb.termerror(
f"{LOG_PREFIX}No 'job' or 'image_uri' loaded from sweep config."
)
self.exit()
return
# For resuming sweeps
self._load_state()
asyncio.run(self._register_agents())
self.run()
def run(self) -> None:
"""Main run function."""
wandb.termlog(f"{LOG_PREFIX}Scheduler running")
self.state = SchedulerState.RUNNING
try:
while True:
self._update_scheduler_run_state()
if not self.is_alive:
break
wandb.termlog(f"{LOG_PREFIX}Polling for new runs to launch")
self._update_run_states()
self._poll()
if self.state == SchedulerState.FLUSH_RUNS:
if self.num_active_runs == 0:
wandb.termlog(f"{LOG_PREFIX}Done polling on runs, exiting")
break
time.sleep(self._polling_sleep)
continue
for worker_id in self.available_workers:
if self.at_runcap:
wandb.termlog(
f"{LOG_PREFIX}Sweep at run_cap ({self._num_runs_launched})"
)
self.state = SchedulerState.FLUSH_RUNS
break
try:
run: Optional[SweepRun] = self._get_next_sweep_run(worker_id)
if not run:
break
except SchedulerError as e:
raise SchedulerError(e)
except Exception as e:
wandb.termerror(
f"{LOG_PREFIX}Failed to get next sweep run: {e}"
)
self.state = SchedulerState.FAILED
break
if self._add_to_launch_queue(run):
self._num_runs_launched += 1
time.sleep(self._polling_sleep)
except KeyboardInterrupt:
wandb.termwarn(f"{LOG_PREFIX}Scheduler received KeyboardInterrupt. Exiting")
self.state = SchedulerState.STOPPED
self.exit()
return
except Exception as e:
wandb.termlog(f"{LOG_PREFIX}Scheduler failed with exception {e}")
self.state = SchedulerState.FAILED
self.exit()
raise
else:
# scheduler succeeds if at runcap
if self.state == SchedulerState.FLUSH_RUNS and self.at_runcap:
self.state = SchedulerState.COMPLETED
self.exit()
def exit(self) -> None:
self._exit()
# _save_state isn't controlled, possibly fails
try:
self._save_state()
except Exception:
wandb.termerror(
f"{LOG_PREFIX}Failed to save state: {traceback.format_exc()}"
)
status = ""
if self.state == SchedulerState.FLUSH_RUNS:
self._set_sweep_state("PAUSED")
status = "paused"
elif self.state == SchedulerState.COMPLETED:
self._set_sweep_state("FINISHED")
status = "completed"
elif self.state in [SchedulerState.CANCELLED, SchedulerState.STOPPED]:
self._set_sweep_state("CANCELED") # one L
status = "cancelled"
self._stop_runs()
else:
self.state = SchedulerState.FAILED
self._set_sweep_state("CRASHED")
status = "crashed"
self._stop_runs()
wandb.termlog(f"{LOG_PREFIX}Scheduler {status}")
self._wandb_run.finish()
def _get_num_runs_launched(self, runs: List[Dict[str, Any]]) -> int:
"""Returns the number of valid runs in the sweep."""
count = 0
for run in runs:
# if bad run, shouldn't be counted against run cap
if run.get("state", "") in ["killed", "crashed"] and not run.get(
"summaryMetrics"
):
_logger.debug(
f"excluding run: {run['name']} with state: {run['state']} from run cap \n{run}"
)
continue
count += 1
return count
def _try_load_executable(self) -> bool:
"""Check existence of valid executable for a run.
logs and returns False when job is unreachable
"""
if self._kwargs.get("job"):
try:
_job_artifact = self._public_api.job(self._kwargs["job"])
wandb.termlog(
f"{LOG_PREFIX}Successfully loaded job ({_job_artifact.name}) in scheduler"
)
except Exception:
wandb.termerror(f"{LOG_PREFIX}{traceback.format_exc()}")
return False
return True
elif self._kwargs.get("image_uri"):
# TODO(gst): check docker existence? Use registry in launch config?
return True
else:
return False
async def _register_agents(self) -> None:
tasks = []
register_agent = event_loop_thread_exec(self._api.register_agent)
for worker_id in range(self._num_workers):
_logger.debug(f"{LOG_PREFIX}Starting AgentHeartbeat worker ({worker_id})")
try:
worker = register_agent(
f"{socket.gethostname()}-{worker_id}", # host
sweep_id=self._sweep_id,
project_name=self._project,
entity=self._entity,
)
tasks.append(worker)
except Exception as e:
_logger.debug(f"failed to register agent: {e}")
self.fail_sweep(f"failed to register agent: {e}")
finished_tasks = await asyncio.gather(*tasks)
for idx, agent_config in enumerate(finished_tasks):
self._workers[idx] = _Worker(
agent_config=agent_config,
agent_id=agent_config["id"],
)
def _yield_runs(self) -> Iterator[Tuple[str, SweepRun]]:
"""Thread-safe way to iterate over the runs."""
with self._threading_lock:
yield from self._runs.items()
def _cleanup_runs(self, runs_to_remove: List[str]) -> None:
"""Helper for removing runs from memory.
Can be overloaded to prevent deletion of runs, which is useful
for debugging or when polling on completed runs.
"""
with self._threading_lock:
for run_id in runs_to_remove:
wandb.termlog(f"{LOG_PREFIX}Cleaning up finished run ({run_id})")
del self._runs[run_id]
def _stop_runs(self) -> None:
to_delete = []
for run_id, _ in self._yield_runs():
to_delete += [run_id]
for run_id in to_delete:
wandb.termlog(f"{LOG_PREFIX}Stopping run ({run_id})")
if not self._stop_run(run_id):
wandb.termwarn(f"{LOG_PREFIX}Failed to stop run ({run_id})")
def _stop_run(self, run_id: str) -> bool:
"""Stops a run and removes it from the scheduler."""
if run_id not in self._runs:
_logger.debug(f"run: {run_id} not in _runs: {self._runs}")
return False
run = self._runs[run_id]
del self._runs[run_id]
if not run.queued_run:
_logger.debug(
f"tried to _stop_run but run not queued yet (run_id:{run.id})"
)
return False
if not run.state.is_alive:
# run already dead, just delete reference
return True
# run still alive, send stop signal
encoded_run_id = base64.standard_b64encode(
f"Run:v1:{run_id}:{self._project}:{self._entity}".encode()
).decode("utf-8")
try:
success: bool = self._api.stop_run(run_id=encoded_run_id)
if success:
wandb.termlog(f"{LOG_PREFIX}Stopped run {run_id}.")
return True
except Exception as e:
_logger.debug(f"error stopping run ({run_id}): {e}")
return False
def _update_scheduler_run_state(self) -> None:
"""Update the scheduler state from state of scheduler run and sweep state."""
state: RunState = self._get_run_state(self._wandb_run.id)
# map scheduler run-state to scheduler-state
if state == RunState.KILLED:
self.state = SchedulerState.STOPPED
elif state in [RunState.FAILED, RunState.CRASHED]:
self.state = SchedulerState.FAILED
elif state == RunState.FINISHED:
self.state = SchedulerState.COMPLETED
# check sweep state for completed states, overwrite scheduler state
try:
sweep_state = self._api.get_sweep_state(
self._sweep_id, self._entity, self._project
)
except Exception as e:
_logger.debug(f"sweep state error: {e}")
return
if sweep_state == "FINISHED":
self.state = SchedulerState.COMPLETED
elif sweep_state in ["CANCELLED", "STOPPED"]:
self.state = SchedulerState.CANCELLED
elif sweep_state == "PAUSED":
self.state = SchedulerState.FLUSH_RUNS
def _update_run_states(self) -> None:
"""Iterate through runs.
Get state from backend and deletes runs if not in running state. Threadsafe.
"""
runs_to_remove: List[str] = []
for run_id, run in self._yield_runs():
run.state = self._get_run_state(run_id, run.state)
try:
rqi_state = run.queued_run.state if run.queued_run else None
except (CommError, LaunchError) as e:
_logger.debug(f"Failed to get queued_run.state: {e}")
rqi_state = None
if not run.state.is_alive or rqi_state == "failed":
_logger.debug(f"({run_id}) states: ({run.state}, {rqi_state})")
runs_to_remove.append(run_id)
self._cleanup_runs(runs_to_remove)
def _get_metrics_from_run(self, run_id: str) -> List[Any]:
"""Use the public api to get metrics from a run.
Uses the metric name found in the sweep config, any
misspellings will result in an empty list.
"""
try:
queued_run: Optional[QueuedRun] = self._runs[run_id].queued_run
if not queued_run:
return []
api_run: Run = self._public_api.run(
f"{queued_run.entity}/{queued_run.project}/{run_id}"
)
metric_name = self._sweep_config["metric"]["name"]
history = api_run.scan_history(keys=["_step", metric_name])
metrics = [x[metric_name] for x in history]
return metrics
except Exception as e:
_logger.debug(f"[_get_metrics_from_run] {e}")
return []
def _get_run_info(self, run_id: str) -> Dict[str, Any]:
"""Use the public api to get info about a run."""
try:
info: Dict[str, Any] = self._api.get_run_info(
self._entity, self._project, run_id
)
if info:
return info
except Exception as e:
_logger.debug(f"[_get_run_info] {e}")
return {}
def _get_run_state(
self, run_id: str, prev_run_state: RunState = RunState.UNKNOWN
) -> RunState:
"""Use the public api to get state of a run."""
run_state = None
try:
state = self._api.get_run_state(self._entity, self._project, run_id)
run_state = RunState(state)
except CommError as e:
_logger.debug(f"error getting state for run ({run_id}): {e}")
if prev_run_state == RunState.UNKNOWN:
# triggers when we get an unknown state for the second time
wandb.termwarn(
f"Failed to get runstate for run ({run_id}). Error: {traceback.format_exc()}"
)
run_state = RunState.FAILED
else: # first time we get unknown state
run_state = RunState.UNKNOWN
except (AttributeError, ValueError):
wandb.termwarn(
f"Bad state ({run_state}) for run ({run_id}). Error: {traceback.format_exc()}"
)
run_state = RunState.UNKNOWN
return run_state
def _create_run(self) -> Dict[str, Any]:
"""Use the public api to create a blank run."""
try:
run: List[Dict[str, Any]] = self._api.upsert_run(
project=self._project,
entity=self._entity,
sweep_name=self._sweep_id,
)
if run:
return run[0]
except Exception as e:
_logger.debug(f"[_create_run] {e}")
raise SchedulerError(
"Error creating run from scheduler, check API connection and CLI version."
)
return {}
def _set_sweep_state(self, state: str) -> None:
wandb.termlog(f"{LOG_PREFIX}Updating sweep state to: {state.lower()}")
try:
self._api.set_sweep_state(sweep=self._sweep_id, state=state)
except Exception as e:
_logger.debug(f"[set_sweep_state] {e}")
def _encode(self, _id: str) -> str:
return (
base64.b64decode(bytes(_id.encode("utf-8"))).decode("utf-8").split(":")[2]
)
def _make_entry_and_launch_config(
self, run: SweepRun
) -> Tuple[Optional[List[str]], Dict[str, Dict[str, Any]]]:
args = create_sweep_command_args({"args": run.args})
entry_point, macro_args = make_launch_sweep_entrypoint(
args, self._sweep_config.get("command")
)
# handle program macro
if entry_point and "${program}" in entry_point:
if not self._sweep_config.get("program"):
raise SchedulerError(
f"{LOG_PREFIX}Program macro in command has no corresponding 'program' in sweep config."
)
pidx = entry_point.index("${program}")
entry_point[pidx] = self._sweep_config["program"]
launch_config = copy.deepcopy(self._wandb_run.config.get("launch", {}))
if "overrides" not in launch_config:
launch_config["overrides"] = {"run_config": {}}
if "run_config" not in launch_config["overrides"]:
launch_config["overrides"]["run_config"] = {}
launch_config["overrides"]["run_config"].update(args["args_dict"])
if macro_args: # pipe in hyperparam args as params to launch
launch_config["overrides"]["args"] = macro_args
if entry_point:
unresolved = [x for x in entry_point if str(x).startswith("${")]
if unresolved:
wandb.termwarn(
f"{LOG_PREFIX}Sweep command contains unresolved macros: "
f"{unresolved}, see launch docs for supported macros."
)
return entry_point, launch_config
def _add_to_launch_queue(self, run: SweepRun) -> bool:
"""Convert a sweeprun into a launch job then push to runqueue."""
# job and image first from CLI args, then from sweep config
_job = self._kwargs.get("job") or self._sweep_config.get("job")
_sweep_config_uri = self._sweep_config.get("image_uri")
_image_uri = self._kwargs.get("image_uri") or _sweep_config_uri
if _job is None and _image_uri is None:
raise SchedulerError(f"{LOG_PREFIX}No 'job' nor 'image_uri' ({run.id})")
elif _job is not None and _image_uri is not None:
raise SchedulerError(f"{LOG_PREFIX}Sweep has both 'job' and 'image_uri'")
entry_point, launch_config = self._make_entry_and_launch_config(run)
if entry_point:
wandb.termwarn(
f"{LOG_PREFIX}Sweep command {entry_point} will override"
f" {'job' if _job else 'image_uri'} entrypoint"
)
# override resource and args of job
_job_launch_config = copy.deepcopy(self._wandb_run.config.get("launch")) or {}
# default priority is "medium"
_priority = int(launch_config.get("priority", 2)) # type: ignore
# strip resource_args and template_variables from launch_config
strip_resource_args_and_template_vars(_job_launch_config)
run_id = run.id or generate_id()
queued_run = launch_add(
run_id=run_id,
entry_point=entry_point,
config=launch_config,
docker_image=_image_uri, # TODO(gst): make agnostic (github? run uri?)
job=_job,
project=self._project,
entity=self._entity,
queue_name=self._kwargs.get("queue"),
project_queue=self._project_queue,
resource=_job_launch_config.get("resource"),
resource_args=_job_launch_config.get("resource_args"),
template_variables=_job_launch_config.get("template_variables"),
author=self._kwargs.get("author"),
sweep_id=self._sweep_id,
priority=_priority,
)
run.queued_run = queued_run
# TODO(gst): unify run and queued_run state
run.state = RunState.RUNNING # assume it will get picked up
self._runs[run_id] = run
wandb.termlog(
f"{LOG_PREFIX}Added run ({run_id}) to queue ({self._kwargs.get('queue')})"
)
return True
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