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enviro.py
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enviro.py
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# IMPLEMENTATION OF Easy21 (10 marks)
import numpy as np
def step(s, a):
# state s (s[0] = dealer card, s[1] = player sum)
# action (hit or stick)
#
psum = s[1]
dealer = s[0]
reward = 0
is_terminal = False
if a == 1:
psum += draw_card()
if psum > 21 or psum < 1:
# player bust
reward = -1
is_terminal = True
elif a == 0:
while 17 > dealer > 0:
dealer += draw_card()
if dealer > 21 or dealer < 1 or psum > dealer:
# dealer bust or player win
reward = 1
elif dealer > psum:
reward = -1
is_terminal = True
else:
print("Not a valid action: {} | should be 0 for stick, or 1 for hit".format(a))
s_prime = [dealer, psum]
return s_prime, reward, is_terminal
def draw_card():
# sample card between [-10, 0) U (0, 10]
card_drawn = (np.random.choice(10) + 1) * np.random.choice([-1, 1], p=[1 / 3, 2 / 3])
return card_drawn
def first_draw():
# sample card between (0, 10]
card_drawn = np.random.choice(10) + 1
return card_drawn