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Viterbi.py
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Viterbi.py
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from decimal import Decimal
import logging
from Casino import Casino
from Environment import Environment
from dice_types import DiceTypes
logger = logging.getLogger(__name__)
class Viterbi():
def __init__(self, from_fair_to_biased_probability, from_biased_to_fair_probability, fair_dice, biased_dice,
num_of_throws):
self.environment = Environment(from_fair_to_biased_probability, from_biased_to_fair_probability,
num_of_throws)
logger.info("Created {}".format(self.environment))
self.generator = Casino(from_fair_to_biased_probability, from_biased_to_fair_probability, fair_dice, biased_dice)
logger.info("Craeted {}".format(self.generator))
def run_test(self):
rolls = self.generator.generate_rolls(self.environment.number_of_throws)
predicted_values = self._calculate(rolls, self.environment)
return rolls, predicted_values
def _calculate(self, rolls, environment):
T = self._initializeViterbi()
for roll in rolls:
U = {}
for next_state in DiceTypes:
total = Decimal(0)
argmax = []
valmax = Decimal(0)
# prob = None
# vpath = []
# vprobability = None
for state in DiceTypes:
objs = T[state]
prob = Decimal(objs[0])
vpath = objs[1]
vprobability = Decimal(objs[2])
trans_value = environment.get_transition_probability(state, next_state)
env_value = environment.get_emission_probability(state, roll.roll_value)
prop_value = env_value * trans_value
prob = prob * prop_value
vprobability = vprobability * prop_value
total = total + prob
if vprobability > valmax:
argmax.clear()
argmax.extend(vpath)
argmax.append(next_state)
valmax = vprobability
U[next_state] = [total, argmax, valmax]
T = U
total = Decimal(0)
argmax = []
valmax = Decimal(0)
for state in DiceTypes:
objs = T[state]
prob = Decimal(objs[0])
vpath = objs[1]
vprob = objs [2]
total = total.append(prob)
if vprob > valmax:
argmax.clear()
argmax.extend(vpath)
valmax = vprob
for k, v in T.items():
logger.info("{} {}".format(k, v))
return argmax
def _initializeViterbi(self):
T = {}
for state in DiceTypes:
state_list = []
list.append(state)
T[state] = [self.environment.start_probability, state_list,
self.environment.start_probability]
return T