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evolution_finder.py
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evolution_finder.py
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import copy
import random
from tqdm import tqdm
import numpy as np
__all__ = ['EvolutionFinder']
class ArchManager:
def __init__(self):
self.num_blocks = 20
self.num_stages = 5
self.kernel_sizes = [3, 5, 7]
self.expand_ratios = [3, 4, 6]
self.depths = [2, 3, 4]
self.resolutions = [160, 176, 192, 208, 224]
def random_sample(self):
sample = {}
d = []
e = []
ks = []
for i in range(self.num_stages):
d.append(random.choice(self.depths))
for i in range(self.num_blocks):
e.append(random.choice(self.expand_ratios))
ks.append(random.choice(self.kernel_sizes))
sample = {
'wid': None,
'ks': ks,
'e': e,
'd': d,
'r': [random.choice(self.resolutions)]
}
return sample
def random_resample(self, sample, i):
assert i >= 0 and i < self.num_blocks
sample['ks'][i] = random.choice(self.kernel_sizes)
sample['e'][i] = random.choice(self.expand_ratios)
def random_resample_depth(self, sample, i):
assert i >= 0 and i < self.num_stages
sample['d'][i] = random.choice(self.depths)
def random_resample_resolution(self, sample):
sample['r'][0] = random.choice(self.resolutions)
class EvolutionFinder:
valid_constraint_range = {
'flops': [150, 600],
'note10': [15, 60],
}
def __init__(self, constraint_type, efficiency_constraint,
efficiency_predictor, accuracy_predictor, **kwargs):
self.constraint_type = constraint_type
if not constraint_type in self.valid_constraint_range.keys():
self.invite_reset_constraint_type()
self.efficiency_constraint = efficiency_constraint
#if not (efficiency_constraint <= self.valid_constraint_range[constraint_type][1] and
# efficiency_constraint >= self.valid_constraint_range[constraint_type][0]):
# self.invite_reset_constraint()
self.efficiency_predictor = efficiency_predictor
self.accuracy_predictor = accuracy_predictor
self.arch_manager = ArchManager()
self.num_blocks = self.arch_manager.num_blocks
self.num_stages = self.arch_manager.num_stages
self.mutate_prob = kwargs.get('mutate_prob', 0.1)
self.population_size = kwargs.get('population_size', 100)
self.max_time_budget = kwargs.get('max_time_budget', 500)
self.max_time_budget2 = kwargs.get('max_time_budget2', 100)
self.parent_ratio = kwargs.get('parent_ratio', 0.25)
self.mutation_ratio = kwargs.get('mutation_ratio', 0.5)
def invite_reset_constraint_type(self):
print('Invalid constraint type! Please input one of:', list(self.valid_constraint_range.keys()))
new_type = input()
while new_type not in self.valid_constraint_range.keys():
print('Invalid constraint type! Please input one of:', list(self.valid_constraint_range.keys()))
new_type = input()
self.constraint_type = new_type
def invite_reset_constraint(self):
print('Invalid constraint_value! Please input an integer in interval: [%d, %d]!' % (
self.valid_constraint_range[self.constraint_type][0],
self.valid_constraint_range[self.constraint_type][1])
)
new_cons = input()
while (not new_cons.isdigit()) or (int(new_cons) > self.valid_constraint_range[self.constraint_type][1]) or \
(int(new_cons) < self.valid_constraint_range[self.constraint_type][0]):
print('Invalid constraint_value! Please input an integer in interval: [%d, %d]!' % (
self.valid_constraint_range[self.constraint_type][0],
self.valid_constraint_range[self.constraint_type][1])
)
new_cons = input()
new_cons = int(new_cons)
self.efficiency_constraint = new_cons
def set_efficiency_constraint(self, new_constraint):
self.efficiency_constraint = new_constraint
def random_sample(self, whichone = 0):
constraint = self.efficiency_constraint[whichone]
while True:
sample = self.arch_manager.random_sample()
efficiency = self.efficiency_predictor.predict_efficiency(sample)
if efficiency <= constraint:
return sample, efficiency
def mutate_sample(self, sample, whichone = 0):
constraint = self.efficiency_constraint[whichone]
while True:
new_sample = copy.deepcopy(sample)
if random.random() < self.mutate_prob:
self.arch_manager.random_resample_resolution(new_sample)
for i in range(self.num_blocks):
if random.random() < self.mutate_prob:
self.arch_manager.random_resample(new_sample, i)
for i in range(self.num_stages):
if random.random() < self.mutate_prob:
self.arch_manager.random_resample_depth(new_sample, i)
efficiency = self.efficiency_predictor.predict_efficiency(new_sample)
if efficiency <= constraint:
return new_sample, efficiency
def crossover_sample(self, sample1, sample2, whichone = 0):
constraint = self.efficiency_constraint[whichone]
while True:
new_sample = copy.deepcopy(sample1)
for key in new_sample.keys():
if not isinstance(new_sample[key], list):
continue
for i in range(len(new_sample[key])):
new_sample[key][i] = random.choice([sample1[key][i], sample2[key][i]])
efficiency = self.efficiency_predictor.predict_efficiency(new_sample)
if efficiency <= constraint:
return new_sample, efficiency
def run_evolution_search(self, verbose=False):
"""Run a single roll-out of regularized evolution to a fixed time budget."""
max_time_budget = self.max_time_budget
population_size = self.population_size
mutation_numbers = int(round(self.mutation_ratio * population_size))
parents_size = int(round(self.parent_ratio * population_size))
constraint = self.efficiency_constraint
best_valids = [-100]
population = [] # (validation, sample, latency) tuples
child_pool = []
efficiency_pool = []
best_info = None
if verbose:
print('Generate random population...')
for _ in range(population_size):
sample, efficiency = self.random_sample()
child_pool.append(sample)
efficiency_pool.append(efficiency)
accs = self.accuracy_predictor.predict_accuracy(child_pool)
for i in range(mutation_numbers):
population.append((accs[i].item(), child_pool[i], efficiency_pool[i]))
if verbose:
print('Start Evolution...')
# After the population is seeded, proceed with evolving the population.
for iter in tqdm(range(max_time_budget), desc='Searching with %s constraint (%s)' % (self.constraint_type, self.efficiency_constraint)):
parents = sorted(population, key=lambda x: x[0])[::-1][:parents_size]
acc = parents[0][0]
if verbose:
print('Iter: {} Acc: {}'.format(iter - 1, parents[0][0]))
if acc > best_valids[-1]:
best_valids.append(acc)
best_info = parents[0]
else:
best_valids.append(best_valids[-1])
population = parents
child_pool = []
efficiency_pool = []
for i in range(mutation_numbers):
par_sample = population[np.random.randint(parents_size)][1]
# Mutate
new_sample, efficiency = self.mutate_sample(par_sample)
child_pool.append(new_sample)
efficiency_pool.append(efficiency)
for i in range(population_size - mutation_numbers):
par_sample1 = population[np.random.randint(parents_size)][1]
par_sample2 = population[np.random.randint(parents_size)][1]
# Crossover
new_sample, efficiency = self.crossover_sample(par_sample1, par_sample2)
child_pool.append(new_sample)
efficiency_pool.append(efficiency)
accs = self.accuracy_predictor.predict_accuracy(child_pool)
for i in range(population_size):
population.append((accs[i].item(), child_pool[i], efficiency_pool[i]))
return best_valids, best_info
def run_evolution_search_multi(self, verbose=False):
"""Run a single roll-out of regularized evolution to a fixed time budget."""
max_time_budget = self.max_time_budget
max_time_budget2 = self.max_time_budget2
population_size = self.population_size
mutation_numbers = int(round(self.mutation_ratio * population_size))
parents_size = int(round(self.parent_ratio * population_size))
constraint = self.efficiency_constraint[0]
r_best_valids = {}
r_best_info = {}
best_valids = [-100]
population = [] # (validation, sample, latency) tuples
child_pool = []
efficiency_pool = []
best_info = None
if verbose:
print('Generate random population...')
for _ in range(population_size):
sample, efficiency = self.random_sample()
child_pool.append(sample)
efficiency_pool.append(efficiency)
accs = self.accuracy_predictor.predict_accuracy(child_pool)
for i in range(mutation_numbers):
population.append((accs[i].item(), child_pool[i], efficiency_pool[i]))
if verbose:
print('Start Evolution...')
# After the population is seeded, proceed with evolving the population.
for iter in tqdm(range(max_time_budget), desc='Searching with %s constraint (%s)' % (self.constraint_type, self.efficiency_constraint[0])):
parents = sorted(population, key=lambda x: x[0])[::-1][:parents_size]
acc = parents[0][0]
if verbose:
print('Iter: {} Acc: {}'.format(iter - 1, parents[0][0]))
if acc > best_valids[-1]:
best_valids.append(acc)
best_info = parents[0]
else:
best_valids.append(best_valids[-1])
population = parents
child_pool = []
efficiency_pool = []
for i in range(mutation_numbers):
par_sample = population[np.random.randint(parents_size)][1]
# Mutate
new_sample, efficiency = self.mutate_sample(par_sample)
child_pool.append(new_sample)
efficiency_pool.append(efficiency)
for i in range(population_size - mutation_numbers):
par_sample1 = population[np.random.randint(parents_size)][1]
par_sample2 = population[np.random.randint(parents_size)][1]
# Crossover
new_sample, efficiency = self.crossover_sample(par_sample1, par_sample2)
child_pool.append(new_sample)
efficiency_pool.append(efficiency)
accs = self.accuracy_predictor.predict_accuracy(child_pool)
for i in range(population_size):
population.append((accs[i].item(), child_pool[i], efficiency_pool[i]))
r_best_valids[0] = best_valids
r_best_info[0] = best_info
k = 1
while k < len(self.efficiency_constraint):
constraint = self.efficiency_constraint[k]
best_valids = [-100]
best_info = None
if verbose:
print('Start Evolution...')
# After the population is seeded, proceed with evolving the population.
for iter in tqdm(range(max_time_budget2), desc='Searching with %s constraint (%s)' % (self.constraint_type, self.efficiency_constraint[k])):
parents = sorted(population, key=lambda x: x[0])[::-1][:parents_size]
acc = parents[0][0]
if verbose:
print('Iter: {} Acc: {}'.format(iter - 1, parents[0][0]))
if acc > best_valids[-1]:
best_valids.append(acc)
best_info = parents[0]
else:
best_valids.append(best_valids[-1])
population = parents
child_pool = []
efficiency_pool = []
for i in range(mutation_numbers):
par_sample = population[np.random.randint(parents_size)][1]
# Mutate
new_sample, efficiency = self.mutate_sample(par_sample, k)
child_pool.append(new_sample)
efficiency_pool.append(efficiency)
for i in range(population_size - mutation_numbers):
par_sample1 = population[np.random.randint(parents_size)][1]
par_sample2 = population[np.random.randint(parents_size)][1]
# Crossover
new_sample, efficiency = self.crossover_sample(par_sample1, par_sample2, k)
child_pool.append(new_sample)
efficiency_pool.append(efficiency)
accs = self.accuracy_predictor.predict_accuracy(child_pool)
for i in range(population_size):
population.append((accs[i].item(), child_pool[i], efficiency_pool[i]))
r_best_valids[k] = best_valids
r_best_info[k] = best_info
k += 1
return r_best_valids, r_best_info