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Changed max to argmax by Chipe1 · Pull Request #455 · aimacode/aima-python · GitHub

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Changed max to argmax #455

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Chipe1 wants to merge 2 commits into from
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Changed max to argmax #455

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80083d1
Changed max to argmax
Chipe1 Mar 31, 2017
f4c4104
argmax for search.py
Chipe1 Mar 31, 2017
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6 changes: 2 additions & 4 deletions search.py
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Original file line number Diff line number Diff line change
Expand Up @@ -544,11 +544,9 @@ def __call__(self, s1): # as of now s1 is a state rather than a percept
self.H[self.s] = min(self.LRTA_cost(self.s, b, self.problem.output(self.s, b),
self.H) for b in self.problem.actions(self.s))

# costs for action b in problem.actions(s1)
costs = [self.LRTA_cost(s1, b, self.problem.output(s1, b), self.H)
for b in self.problem.actions(s1)]
# an action b in problem.actions(s1) that minimizes costs
self.a = list(self.problem.actions(s1))[costs.index(min(costs))]
self.a = argmin(self.problem.actions(s1),
key=lambda b:self.LRTA_cost(s1, b, self.problem.output(s1, b), self.H))

self.s = s1
return self.a
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11 changes: 5 additions & 6 deletions text.py
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,7 @@ def add_sequence(self, words):
n = self.n
words = self.add_empty(words, n)

for i in range(len(words) - n):
for i in range(len(words) - n + 1):
self.add(tuple(words[i:i + n]))

def samples(self, nwords):
Expand Down Expand Up @@ -318,9 +318,7 @@ def score(self, plaintext):
def decode(self, ciphertext):
"""Return the shift decoding of text with the best score."""

list_ = [(self.score(shift), shift)
for shift in all_shifts(ciphertext)]
return max(list_, key=lambda elm: elm[0])[1]
return argmax(all_shifts(ciphertext), key=lambda shift: self.score(shift))


def all_shifts(text):
Expand Down Expand Up @@ -380,8 +378,9 @@ def __init__(self, initial=None, goal=None, decoder=None):

def actions(self, state):
# Find the best
p, plainchar = max([(self.decoder.P1[c], c)
for c in alphabet if c not in state])

search_list = [c for c in alphabet if c not in state]
plainchar = argmax(search_list, key=lambda c: self.decoder.P1[c])

norvig Apr 6, 2017

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

This is fine, but I wonder which is clearer:
lambda c: self.decoder.P1[c]
or
self.decoder.P1.get

Chipe1 Apr 7, 2017

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Did you mean self.decoder.P1.getitem
I got an error when I tried self.decoder.P1.get AttributeError: 'UnigramTextModel' object has no attribute 'get'
succs = [extend(state, plainchar, cipherchar)] # ???? # noqa

def goal_test(self, state):
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