def updateParticlePosition(self):
for i in range(0, self.dimension):
self.position[i] = self.position[i] + self.velocity[i]
clip(self.position[i],
self.searchMins[i],
self.searchMaxs[i])
def updateParticleVelocity(self):
for i in range(0, self.dimension):
# if mins[i] == maxs[i] then ignore, we aren't optimizing it
if self.searchMins[i] == self.searchMaxs[i]:
continue
# Random component to avoid local minima
R1 = random.random()
R2 = random.random()
self.velocity[i] = self.INERTIAL*self.velocity[i] \
+ COG * R1 * (self.pBest_vars[i] - self.position[i]) \
+ SOC * R2 * (self.gBest_position[i] - self.position[i])
clip(self.velocity[i],
-self.velocityCap[i],
self.velocityCap[i])
if fabs(self.velocity[i]) < VELOCITY_MINIMUM_MAGNITUDE:
self.velocity[i] = 0
def updateParticlePosition(self):
for i in range(0, self.dimension):
newPosition = self.position[i] + self.velocity[i]
if ((newPosition > self.searchMaxs[i]) or
(newPosition < self.searchMins[i]) and
RANDOMIZE_LOST_PARTICLES):
if DEBUG:
print 'Randomized a lost particle (dimension {0})'.format(i)
self.position[i] = random.uniform(self.searchMins[i],
self.searchMaxs[i])
self.velocity[i] = 0
else:
self.position[i] = clip(newPosition,
self.searchMins[i],
self.searchMaxs[i])
def updateParticleVelocity(self):
for i in range(0, self.dimension):
# if mins[i] == maxs[i] then ignore, we aren't optimizing it
if self.searchMins[i] == self.searchMaxs[i]:
continue
# Random component to avoid local minima
R1 = random.random()
R2 = random.random()
newVelocity = self.INERTIAL*self.velocity[i] \
+ COG * R1 * (self.pBest_position[i] - self.position[i]) \
+ SOC * R2 * (self.gBest_position[i] - self.position[i])
self.velocity[i] = clip(newVelocity,
-self.velocityCap[i],
self.velocityCap[i])
if fabs(self.velocity[i]) < VELOCITY_MINIMUM_MAGNITUDE:
self.velocity[i] = 0
