from typing import Union, List, Dict, Optional, Any
import math
import random
import time
import gymnasium as gym
import os
import numpy as np
import numpy.typing as npt
import gym_csle_stopping_game.constants.constants as env_constants
from csle_common.dao.emulation_config.emulation_env_config import EmulationEnvConfig
from csle_common.dao.simulation_config.simulation_env_config import SimulationEnvConfig
from csle_common.dao.training.experiment_config import ExperimentConfig
from csle_common.dao.training.experiment_execution import ExperimentExecution
from csle_common.dao.training.experiment_result import ExperimentResult
from csle_common.dao.training.agent_type import AgentType
from csle_common.dao.training.player_type import PlayerType
from csle_common.util.experiment_util import ExperimentUtil
from csle_common.logging.log import Logger
from csle_common.dao.training.multi_threshold_stopping_policy import MultiThresholdStoppingPolicy
from csle_common.dao.training.linear_threshold_stopping_policy import LinearThresholdStoppingPolicy
from csle_common.dao.training.policy_type import PolicyType
from csle_common.metastore.metastore_facade import MetastoreFacade
from csle_common.dao.jobs.training_job_config import TrainingJobConfig
from csle_common.dao.simulation_config.base_env import BaseEnv
from csle_common.util.general_util import GeneralUtil
from csle_agents.common.objective_type import ObjectiveType
from csle_agents.agents.base.base_agent import BaseAgent
import csle_agents.constants.constants as agents_constants
[docs]class DifferentialEvolutionAgent(BaseAgent):
"""
Differential evolution agent
"""
def __init__(self, simulation_env_config: SimulationEnvConfig,
emulation_env_config: Union[None, EmulationEnvConfig],
experiment_config: ExperimentConfig, env: Optional[BaseEnv] = None,
training_job: Optional[TrainingJobConfig] = None, save_to_metastore: bool = True):
"""
Initializes the Differential evolution Agent
:param simulation_env_config: the simulation env config
:param emulation_env_config: the emulation env config
:param experiment_config: the experiment config
:param env: (optional) the gym environment to use for simulation
:param training_job: (optional) a training job configuration
:param save_to_metastore: boolean flag that can be set to avoid saving results and progress to the metastore
"""
super().__init__(simulation_env_config=simulation_env_config, emulation_env_config=emulation_env_config,
experiment_config=experiment_config)
assert experiment_config.agent_type == AgentType.DIFFERENTIAL_EVOLUTION
self.env = env
self.training_job = training_job
self.save_to_metastore = save_to_metastore
[docs] def train(self) -> ExperimentExecution:
"""
Performs the policy training for the given random seeds using differential evolution
:return: the training metrics and the trained policies
"""
pid = os.getpid()
# Initialize metrics
exp_result = ExperimentResult()
exp_result.plot_metrics.append(agents_constants.COMMON.AVERAGE_RETURN)
exp_result.plot_metrics.append(agents_constants.COMMON.RUNNING_AVERAGE_RETURN)
exp_result.plot_metrics.append(env_constants.ENV_METRICS.INTRUSION_LENGTH)
exp_result.plot_metrics.append(agents_constants.COMMON.RUNNING_AVERAGE_INTRUSION_LENGTH)
exp_result.plot_metrics.append(env_constants.ENV_METRICS.INTRUSION_START)
exp_result.plot_metrics.append(agents_constants.COMMON.RUNNING_AVERAGE_INTRUSION_START)
exp_result.plot_metrics.append(env_constants.ENV_METRICS.TIME_HORIZON)
exp_result.plot_metrics.append(agents_constants.COMMON.RUNTIME)
exp_result.plot_metrics.append(agents_constants.COMMON.RUNNING_AVERAGE_TIME_HORIZON)
exp_result.plot_metrics.append(env_constants.ENV_METRICS.AVERAGE_UPPER_BOUND_RETURN)
exp_result.plot_metrics.append(env_constants.ENV_METRICS.AVERAGE_DEFENDER_BASELINE_STOP_ON_FIRST_ALERT_RETURN)
for l in range(1, self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.L].value + 1):
exp_result.plot_metrics.append(env_constants.ENV_METRICS.STOP + f"_{l}")
exp_result.plot_metrics.append(env_constants.ENV_METRICS.STOP + f"_running_average_{l}")
descr = f"Training of policies with the differential evolution algorithm using " \
f"simulation:{self.simulation_env_config.name}"
for seed in self.experiment_config.random_seeds:
exp_result.all_metrics[seed] = {}
exp_result.all_metrics[seed][agents_constants.DIFFERENTIAL_EVOLUTION.THETAS] = []
exp_result.all_metrics[seed][agents_constants.COMMON.AVERAGE_RETURN] = []
exp_result.all_metrics[seed][agents_constants.COMMON.RUNNING_AVERAGE_RETURN] = []
exp_result.all_metrics[seed][agents_constants.DIFFERENTIAL_EVOLUTION.THRESHOLDS] = []
if self.experiment_config.player_type == PlayerType.DEFENDER:
for l in range(1, self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.L].value + 1):
exp_result.all_metrics[seed][
agents_constants.DIFFERENTIAL_EVOLUTION.STOP_DISTRIBUTION_DEFENDER + f"_l={l}"] = []
else:
for s in self.simulation_env_config.state_space_config.states:
for l in range(1,
self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.L].value + 1):
exp_result.all_metrics[seed][agents_constants.DIFFERENTIAL_EVOLUTION.STOP_DISTRIBUTION_ATTACKER
+ f"_l={l}_s={s.id}"] = []
exp_result.all_metrics[seed][agents_constants.COMMON.RUNNING_AVERAGE_INTRUSION_START] = []
exp_result.all_metrics[seed][agents_constants.COMMON.RUNNING_AVERAGE_TIME_HORIZON] = []
exp_result.all_metrics[seed][agents_constants.COMMON.RUNNING_AVERAGE_INTRUSION_LENGTH] = []
exp_result.all_metrics[seed][agents_constants.COMMON.RUNTIME] = []
exp_result.all_metrics[seed][env_constants.ENV_METRICS.INTRUSION_START] = []
exp_result.all_metrics[seed][env_constants.ENV_METRICS.INTRUSION_LENGTH] = []
exp_result.all_metrics[seed][env_constants.ENV_METRICS.TIME_HORIZON] = []
exp_result.all_metrics[seed][env_constants.ENV_METRICS.AVERAGE_UPPER_BOUND_RETURN] = []
exp_result.all_metrics[seed][
env_constants.ENV_METRICS.AVERAGE_DEFENDER_BASELINE_STOP_ON_FIRST_ALERT_RETURN] = []
for l in range(1, self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.L].value + 1):
exp_result.all_metrics[seed][env_constants.ENV_METRICS.STOP + f"_{l}"] = []
exp_result.all_metrics[seed][env_constants.ENV_METRICS.STOP + f"_running_average_{l}"] = []
# Initialize training job
if self.training_job is None:
emulation_name = ""
if self.emulation_env_config is not None:
emulation_name = self.emulation_env_config.name
self.training_job = TrainingJobConfig(
simulation_env_name=self.simulation_env_config.name, experiment_config=self.experiment_config,
progress_percentage=0, pid=pid, experiment_result=exp_result,
emulation_env_name=emulation_name, simulation_traces=[],
num_cached_traces=agents_constants.COMMON.NUM_CACHED_SIMULATION_TRACES,
log_file_path=Logger.__call__().get_log_file_path(), descr=descr,
physical_host_ip=GeneralUtil.get_host_ip())
if self.save_to_metastore:
training_job_id = MetastoreFacade.save_training_job(training_job=self.training_job)
self.training_job.id = training_job_id
else:
self.training_job.pid = pid
self.training_job.progress_percentage = 0
self.training_job.experiment_result = exp_result
if self.save_to_metastore:
MetastoreFacade.update_training_job(training_job=self.training_job, id=self.training_job.id)
# Initialize execution result
ts = time.time()
emulation_name = ""
if self.emulation_env_config is not None:
emulation_name = self.emulation_env_config.name
simulation_name = self.simulation_env_config.name
self.exp_execution = ExperimentExecution(
result=exp_result, config=self.experiment_config, timestamp=ts, emulation_name=emulation_name,
simulation_name=simulation_name, descr=descr, log_file_path=self.training_job.log_file_path)
if self.save_to_metastore:
exp_execution_id = MetastoreFacade.save_experiment_execution(self.exp_execution)
self.exp_execution.id = exp_execution_id
config = self.simulation_env_config.simulation_env_input_config
if self.env is None:
self.env = gym.make(self.simulation_env_config.gym_env_name, config=config)
for seed in self.experiment_config.random_seeds:
ExperimentUtil.set_seed(seed)
exp_result = self.differential_evolution(
exp_result=exp_result, seed=seed, training_job=self.training_job,
random_seeds=self.experiment_config.random_seeds)
# Save latest trace
if self.save_to_metastore:
MetastoreFacade.save_simulation_trace(self.env.get_traces()[-1])
self.env.reset_traces()
# Calculate average and std metrics
exp_result.avg_metrics = {}
exp_result.std_metrics = {}
for metric in exp_result.all_metrics[self.experiment_config.random_seeds[0]].keys():
value_vectors = []
for seed in self.experiment_config.random_seeds:
value_vectors.append(exp_result.all_metrics[seed][metric])
avg_metrics = []
std_metrics = []
for i in range(len(value_vectors[0])):
if type(value_vectors[0][0]) is int or type(value_vectors[0][0]) is float \
or type(value_vectors[0][0]) is np.int64 or type(value_vectors[0][0]) is np.float64:
seed_values = []
for seed_idx in range(len(self.experiment_config.random_seeds)):
seed_values.append(value_vectors[seed_idx][i])
avg = ExperimentUtil.mean_confidence_interval(
data=seed_values,
confidence=self.experiment_config.hparams[agents_constants.COMMON.CONFIDENCE_INTERVAL].value)[0]
if not math.isnan(avg):
avg_metrics.append(avg)
ci = ExperimentUtil.mean_confidence_interval(
data=seed_values,
confidence=self.experiment_config.hparams[agents_constants.COMMON.CONFIDENCE_INTERVAL].value)[1]
if not math.isnan(ci):
std_metrics.append(ci)
else:
std_metrics.append(-1)
else:
avg_metrics.append(-1)
std_metrics.append(-1)
exp_result.avg_metrics[metric] = avg_metrics
exp_result.std_metrics[metric] = std_metrics
traces = self.env.get_traces()
if len(traces) > 0 and self.save_to_metastore:
MetastoreFacade.save_simulation_trace(traces[-1])
ts = time.time()
self.exp_execution.timestamp = ts
self.exp_execution.result = exp_result
if self.save_to_metastore:
MetastoreFacade.update_experiment_execution(experiment_execution=self.exp_execution,
id=self.exp_execution.id)
return self.exp_execution
[docs] def hparam_names(self) -> List[str]:
"""
:return: a list with the hyperparameter names
"""
return [agents_constants.RANDOM_SEARCH.N, agents_constants.DIFFERENTIAL_EVOLUTION.POPULATION_SIZE,
agents_constants.DIFFERENTIAL_EVOLUTION.RECOMBINATION,
agents_constants.DIFFERENTIAL_EVOLUTION.MUTATE,
agents_constants.RANDOM_SEARCH.L, agents_constants.RANDOM_SEARCH.THETA1,
agents_constants.COMMON.EVAL_BATCH_SIZE,
agents_constants.COMMON.CONFIDENCE_INTERVAL,
agents_constants.COMMON.RUNNING_AVERAGE]
[docs] def differential_evolution(self, exp_result: ExperimentResult, seed: int,
training_job: TrainingJobConfig, random_seeds: List[int]) -> ExperimentResult:
"""
Runs the differential evolution algorithm
:param exp_result: the experiment result object to store the result
:param seed: the seed
:param training_job: the training job config
:param random_seeds: list of seeds
:return: the updated experiment result and the trained policy
"""
start = time.time()
objective = self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.OBJECTIVE_TYPE].value
L = self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.L].value
if agents_constants.DIFFERENTIAL_EVOLUTION.THETA1 in self.experiment_config.hparams:
theta = self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.THETA1].value
else:
if self.experiment_config.player_type == PlayerType.DEFENDER:
theta = DifferentialEvolutionAgent.initial_theta(L=L)
else:
theta = DifferentialEvolutionAgent.initial_theta(L=2 * L)
# Initial eval
policy = self.get_policy(theta=list(theta), L=L)
if self.env is not None:
if self.experiment_config.player_type == PlayerType.DEFENDER:
self.env.static_defender_strategy = policy
if self.experiment_config.player_type == PlayerType.ATTACKER:
self.env.static_attacker_strategy = policy
best_policy = policy
avg_metrics = self.eval_theta(
policy=policy,
max_steps=self.experiment_config.hparams[agents_constants.COMMON.MAX_ENV_STEPS].value)
J = round(avg_metrics[env_constants.ENV_METRICS.RETURN], 3)
policy.avg_R = J
exp_result.all_metrics[seed][agents_constants.COMMON.AVERAGE_RETURN].append(J)
exp_result.all_metrics[seed][agents_constants.COMMON.RUNNING_AVERAGE_RETURN].append(J)
exp_result.all_metrics[seed][agents_constants.DIFFERENTIAL_EVOLUTION.THETAS].append(
DifferentialEvolutionAgent.round_vec(theta))
time_elapsed_minutes = round((time.time() - start) / 60, 3)
exp_result.all_metrics[seed][agents_constants.COMMON.RUNTIME].append(time_elapsed_minutes)
Logger.__call__().get_logger().info(
f"[DIFFERENTIAL-EVOLUTION] i: {0}, J:{J}, "
f"J_avg_{self.experiment_config.hparams[agents_constants.COMMON.RUNNING_AVERAGE].value}:"
f"{J}, theta:{policy.theta}, runtime (m): {time_elapsed_minutes}, progress: {0}%")
# Hyperparameters
N = self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.N].value
population_size = self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.POPULATION_SIZE].value
mutate = self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.MUTATE].value
recombination = self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.RECOMBINATION].value
bounds = self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.BOUNDS].value
# Initial eval
population = []
values = []
for i in range(0, population_size):
indv = []
for j in range(len(bounds)):
indv.append(random.uniform(bounds[j][0], bounds[j][1]))
population.append(indv)
gen_sol = population[0]
candidate_policy = self.get_policy(theta=list(gen_sol), L=L)
avg_metrics = self.eval_theta(
policy=candidate_policy,
max_steps=self.experiment_config.hparams[agents_constants.COMMON.MAX_ENV_STEPS].value)
J = round(avg_metrics[env_constants.ENV_METRICS.RETURN], 3)
values.append(J)
# cycle through each generation (step #2)
for i in range(1, N + 1):
gen_scores = [] # score keeping
# cycle through each individual in the population
for j in range(0, population_size):
# MUTATION STEP
# select three random vector index positions [0, popsize), not including current vector (j)
candidates = list(range(0, population_size))
candidates.remove(j)
random_index = random.sample(candidates, 3)
x_1 = population[random_index[0]]
x_2 = population[random_index[1]]
x_3 = population[random_index[2]]
x_t = population[j] # target individual
# subtract x3 from x2, and create a new vector (x_diff)
x_diff = [x_2_i - x_3_i for x_2_i, x_3_i in zip(x_2, x_3)]
# multiply x_diff by the mutation factor (F) and add to x_1
v_donor = [x_1_i + mutate * x_diff_i for x_1_i, x_diff_i in zip(x_1, x_diff)]
# v_donor = self.ensure_bounds(v_donor, bounds)
# RECOMBINATION STEP
v_trial = []
for k in range(len(x_t)):
crossover = random.random()
if crossover <= recombination:
v_trial.append(v_donor[k])
else:
v_trial.append(x_t[k])
# GREEDY SELECTION STEP
candidate_policy = self.get_policy(theta=list(v_trial), L=L)
avg_metrics = self.eval_theta(
policy=candidate_policy,
max_steps=self.experiment_config.hparams[agents_constants.COMMON.MAX_ENV_STEPS].value)
score_trial = round(avg_metrics[env_constants.ENV_METRICS.RETURN], 3)
candidate_policy = self.get_policy(theta=list(x_t), L=L)
avg_metrics = self.eval_theta(
policy=candidate_policy,
max_steps=self.experiment_config.hparams[agents_constants.COMMON.MAX_ENV_STEPS].value)
score_target = round(avg_metrics[env_constants.ENV_METRICS.RETURN], 3)
if objective == ObjectiveType.MAX:
if score_trial > score_target:
population[j] = v_trial
gen_scores.append(score_trial)
else:
gen_scores.append(score_target)
else:
if score_trial < score_target:
population[j] = v_trial
gen_scores.append(score_trial)
else:
gen_scores.append(score_target)
if objective == ObjectiveType.MAX:
gen_best = max(gen_scores) # fitness of best individual
gen_sol = population[gen_scores.index(max(gen_scores))] # solution of best individual
else:
gen_best = min(gen_scores) # fitness of best individual
gen_sol = population[gen_scores.index(min(gen_scores))] # solution of best individual
best_policy = self.get_policy(theta=list(gen_sol), L=L)
values.append(gen_best)
J = gen_best
# Log average return
best_policy.avg_R = J
running_avg_J = ExperimentUtil.running_average(
exp_result.all_metrics[seed][agents_constants.COMMON.AVERAGE_RETURN],
self.experiment_config.hparams[agents_constants.COMMON.RUNNING_AVERAGE].value)
exp_result.all_metrics[seed][agents_constants.COMMON.AVERAGE_RETURN].append(J)
exp_result.all_metrics[seed][agents_constants.COMMON.RUNNING_AVERAGE_RETURN].append(running_avg_J)
# log runtime
time_elapsed_minutes = round((time.time() - start) / 60, 3)
exp_result.all_metrics[seed][agents_constants.COMMON.RUNTIME].append(time_elapsed_minutes)
# Log thresholds
exp_result.all_metrics[seed][agents_constants.DIFFERENTIAL_EVOLUTION.THETAS].append(
DifferentialEvolutionAgent.round_vec(theta))
if self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.POLICY_TYPE] \
== PolicyType.MULTI_THRESHOLD:
exp_result.all_metrics[seed][agents_constants.DIFFERENTIAL_EVOLUTION.THRESHOLDS].append(
DifferentialEvolutionAgent.round_vec(best_policy.thresholds()))
if self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.POLICY_TYPE] \
== PolicyType.MULTI_THRESHOLD:
# Log stop distribution
for k, v in best_policy.stop_distributions().items():
exp_result.all_metrics[seed][k].append(v)
# Log intrusion lengths
if env_constants.ENV_METRICS.INTRUSION_LENGTH in exp_result.all_metrics:
exp_result.all_metrics[seed][env_constants.ENV_METRICS.INTRUSION_LENGTH].append(
round(avg_metrics[env_constants.ENV_METRICS.INTRUSION_LENGTH], 3))
if agents_constants.COMMON.RUNNING_AVERAGE_INTRUSION_LENGTH in exp_result.all_metrics:
exp_result.all_metrics[seed][agents_constants.COMMON.RUNNING_AVERAGE_INTRUSION_LENGTH].append(
ExperimentUtil.running_average(
exp_result.all_metrics[seed][env_constants.ENV_METRICS.INTRUSION_LENGTH],
self.experiment_config.hparams[agents_constants.COMMON.RUNNING_AVERAGE].value))
# Log stopping times
if env_constants.ENV_METRICS.INTRUSION_START in exp_result.all_metrics:
exp_result.all_metrics[seed][env_constants.ENV_METRICS.INTRUSION_START].append(
round(avg_metrics[env_constants.ENV_METRICS.INTRUSION_START], 3))
if agents_constants.COMMON.RUNNING_AVERAGE_INTRUSION_START in exp_result.all_metrics:
exp_result.all_metrics[seed][agents_constants.COMMON.RUNNING_AVERAGE_INTRUSION_START].append(
ExperimentUtil.running_average(
exp_result.all_metrics[seed][env_constants.ENV_METRICS.INTRUSION_START],
self.experiment_config.hparams[agents_constants.COMMON.RUNNING_AVERAGE].value))
exp_result.all_metrics[seed][env_constants.ENV_METRICS.TIME_HORIZON].append(
round(avg_metrics[env_constants.ENV_METRICS.TIME_HORIZON], 3))
exp_result.all_metrics[seed][agents_constants.COMMON.RUNNING_AVERAGE_TIME_HORIZON].append(
ExperimentUtil.running_average(
exp_result.all_metrics[seed][env_constants.ENV_METRICS.TIME_HORIZON],
self.experiment_config.hparams[agents_constants.COMMON.RUNNING_AVERAGE].value))
if env_constants.ENV_METRICS.STOP + f"_{1}" in avg_metrics:
for l in range(1, self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.L].value + 1):
exp_result.plot_metrics.append(env_constants.ENV_METRICS.STOP + f"_{l}")
exp_result.all_metrics[seed][env_constants.ENV_METRICS.STOP + f"_{l}"].append(
round(avg_metrics[env_constants.ENV_METRICS.STOP + f"_{l}"], 3))
exp_result.all_metrics[seed][env_constants.ENV_METRICS.STOP + f"_running_average_{l}"].append(
ExperimentUtil.running_average(
exp_result.all_metrics[seed][env_constants.ENV_METRICS.STOP + f"_{l}"],
self.experiment_config.hparams[agents_constants.COMMON.RUNNING_AVERAGE].value))
# Log baseline returns
if env_constants.ENV_METRICS.AVERAGE_UPPER_BOUND_RETURN in avg_metrics:
exp_result.all_metrics[seed][env_constants.ENV_METRICS.AVERAGE_UPPER_BOUND_RETURN].append(
round(avg_metrics[env_constants.ENV_METRICS.AVERAGE_UPPER_BOUND_RETURN], 3))
if env_constants.ENV_METRICS.AVERAGE_DEFENDER_BASELINE_STOP_ON_FIRST_ALERT_RETURN in avg_metrics:
exp_result.all_metrics[seed][
env_constants.ENV_METRICS.AVERAGE_DEFENDER_BASELINE_STOP_ON_FIRST_ALERT_RETURN].append(
round(avg_metrics[env_constants.ENV_METRICS.AVERAGE_DEFENDER_BASELINE_STOP_ON_FIRST_ALERT_RETURN],
3))
if i % self.experiment_config.log_every == 0 and i > 0:
# Update training job
total_iterations = len(random_seeds) * N
iterations_done = (random_seeds.index(seed)) * N + i
progress = round(iterations_done / total_iterations, 2)
training_job.progress_percentage = progress
training_job.experiment_result = exp_result
if self.env is not None and len(self.env.get_traces()) > 0:
training_job.simulation_traces.append(self.env.get_traces()[-1])
if len(training_job.simulation_traces) > training_job.num_cached_traces:
training_job.simulation_traces = training_job.simulation_traces[1:]
if self.save_to_metastore:
MetastoreFacade.update_training_job(training_job=training_job, id=training_job.id)
# Update execution
ts = time.time()
self.exp_execution.timestamp = ts
self.exp_execution.result = exp_result
if self.save_to_metastore:
MetastoreFacade.update_experiment_execution(experiment_execution=self.exp_execution,
id=self.exp_execution.id)
T_avg = exp_result.all_metrics[seed][env_constants.ENV_METRICS.TIME_HORIZON][-1]
Logger.__call__().get_logger().info(
f"[DIFFERENTIAL-EVOLUTION] i: {i}, J:{J}, "
f"J_avg_{self.experiment_config.hparams[agents_constants.COMMON.RUNNING_AVERAGE].value}:"
f"{running_avg_J}, "
f"opt_J:{exp_result.all_metrics[seed][env_constants.ENV_METRICS.AVERAGE_UPPER_BOUND_RETURN][-1]}, "
f"theta:{best_policy.theta}, T: {T_avg}, runtime (m): {time_elapsed_minutes}, "
f"progress: {round(progress * 100, 2)}%")
exp_result.policies[seed] = best_policy
# Save policy
if self.save_to_metastore:
MetastoreFacade.save_multi_threshold_stopping_policy(multi_threshold_stopping_policy=policy)
return exp_result
[docs] def eval_theta(self, policy: Union[MultiThresholdStoppingPolicy, LinearThresholdStoppingPolicy],
max_steps: int = 200) -> Dict[str, Union[float, int]]:
"""
Evaluates a given threshold policy by running monte-carlo simulations
:param policy: the policy to evaluate
:return: the average metrics of the evaluation
"""
if self.env is None:
raise ValueError("Need to specify an environment to run the evaluation")
eval_batch_size = self.experiment_config.hparams[agents_constants.COMMON.EVAL_BATCH_SIZE].value
metrics: Dict[str, Any] = {}
for j in range(eval_batch_size):
done = False
o, _ = self.env.reset()
l = int(o[0])
b1 = o[1]
t = 1
r = 0
a = 0
info: Dict[str, Any] = {}
while not done and t <= max_steps:
Logger.__call__().get_logger().debug(f"t:{t}, a: {a}, b1:{b1}, r:{r}, l:{l}, info:{info}")
if self.experiment_config.player_type == PlayerType.ATTACKER:
policy.opponent_strategy = self.env.static_defender_strategy
a = policy.action(o=o)
else:
a = policy.action(o=o)
o, r, done, _, info = self.env.step(a)
l = int(o[0])
b1 = o[1]
t += 1
metrics = DifferentialEvolutionAgent.update_metrics(metrics=metrics, info=info)
avg_metrics = DifferentialEvolutionAgent.compute_avg_metrics(metrics=metrics)
return avg_metrics
[docs] @staticmethod
def update_metrics(metrics: Dict[str, List[Union[float, int]]], info: Dict[str, Union[float, int]]) \
-> Dict[str, List[Union[float, int]]]:
"""
Update a dict with aggregated metrics using new information from the environment
:param metrics: the dict with the aggregated metrics
:param info: the new information
:return: the updated dict
"""
for k, v in info.items():
if k in metrics:
metrics[k].append(round(v, 3))
else:
metrics[k] = [v]
return metrics
[docs] @staticmethod
def compute_avg_metrics(metrics: Dict[str, List[Union[float, int]]]) -> Dict[str, Union[float, int]]:
"""
Computes the average metrics of a dict with aggregated metrics
:param metrics: the dict with the aggregated metrics
:return: the average metrics
"""
avg_metrics = {}
for k, v in metrics.items():
avg = round(sum(v) / len(v), 2)
avg_metrics[k] = avg
return avg_metrics
[docs] @staticmethod
def initial_theta(L: int) -> npt.NDArray[Any]:
"""
Initializes theta randomly
:param L: the dimension of theta
:return: the initialized theta vector
"""
theta_1 = []
for k in range(L):
theta_1.append(np.random.uniform(-3, 3))
return np.array(theta_1)
[docs] @staticmethod
def round_vec(vec) -> List[float]:
"""
Rounds a vector to 3 decimals
:param vec: the vector to round
:return: the rounded vector
"""
return list(map(lambda x: round(x, 3), vec))
[docs] def ensure_bounds(self, vec, bounds) -> List[float]:
"""
Utility function to ensure parameter bounds
:param vec: the parameter vector
:param bounds: the bounds
:return: the bounded vector
"""
vec_new = []
# cycle through each variable in vector
for i in range(len(vec)):
# variable exceedes the minimum boundary
if vec[i] < bounds[i][0]:
vec_new.append(bounds[i][0])
# variable exceedes the maximum boundary
if vec[i] > bounds[i][1]:
vec_new.append(bounds[i][1])
# the variable is fine
if bounds[i][0] <= vec[i] <= bounds[i][1]:
vec_new.append(vec[i])
return vec_new
[docs] def get_policy(self, theta: List[float], L: int) -> Union[MultiThresholdStoppingPolicy,
LinearThresholdStoppingPolicy]:
"""
Utility method for getting the policy from a parameter vector
:param theta: the parameter vector
:param L: the number of parameters
:return: the policy
"""
if self.experiment_config.hparams[agents_constants.DIFFERENTIAL_EVOLUTION.POLICY_TYPE].value \
== PolicyType.MULTI_THRESHOLD.value:
policy = MultiThresholdStoppingPolicy(
theta=list(theta), simulation_name=self.simulation_env_config.name,
states=self.simulation_env_config.state_space_config.states,
player_type=self.experiment_config.player_type, L=L,
actions=self.simulation_env_config.joint_action_space_config.action_spaces[
self.experiment_config.player_idx].actions, experiment_config=self.experiment_config, avg_R=-1,
agent_type=AgentType.DIFFERENTIAL_EVOLUTION)
else:
policy = LinearThresholdStoppingPolicy(
theta=list(theta), simulation_name=self.simulation_env_config.name,
states=self.simulation_env_config.state_space_config.states,
player_type=self.experiment_config.player_type, L=L,
actions=self.simulation_env_config.joint_action_space_config.action_spaces[
self.experiment_config.player_idx].actions, experiment_config=self.experiment_config, avg_R=-1,
agent_type=AgentType.DIFFERENTIAL_EVOLUTION)
return policy