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Minor fixes/tweaks to Utility AI

This commit is contained in:
Stephen Seo 2022-03-07 19:50:43 +09:00
parent 14d224734f
commit 21041132c6
1 changed files with 11 additions and 9 deletions
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20
front_end/src/ai.rs
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@ -78,9 +78,17 @@ pub fn get_ai_choice(
return Err("All slots are full".into());
}
// shuffle utilities for the cases where there are equivalent utilities
let mut utilities: Vec<(usize, f64)> = utilities.into_iter().enumerate().collect();
if utilities.len() > 1 {
for i in 1..utilities.len() {
utilities.swap(i, thread_rng().gen_range(0..=i));
}
}
let pick_some_of_choices = |amount: usize| -> Result<SlotChoice, String> {
let mut maximums: BTreeMap<i64, usize> = BTreeMap::new();
for (idx, utility) in utilities.iter().enumerate() {
for (idx, utility) in &utilities {
// f64 cannot be used as Key since it doesn't implement Ord.
// Use i64 as a substitute, noting that the map stores in ascending
// order.
@ -88,7 +96,7 @@ pub fn get_ai_choice(
while maximums.contains_key(&utility_value) {
utility_value += thread_rng().gen_range(-3..=3);
}
maximums.insert(utility_value, idx);
maximums.insert(utility_value, *idx);
}
// don't pick from more items than what exists
@ -108,6 +116,7 @@ pub fn get_ai_choice(
let rand_idx = maximums.len() - 1 - random_number;
// turns the map into a vector of (key, value), then pick out of the
// last few values by index the "value" which is the SlotChoice.
// This is done because BTreeMap stores keys in ascending order.
Ok((*maximums.iter().collect::<Vec<(&i64, &usize)>>()[rand_idx].1).into())
};
@ -115,13 +124,6 @@ pub fn get_ai_choice(
AIDifficulty::Easy => pick_some_of_choices(AI_EASY_MAX_CHOICES),
AIDifficulty::Normal => pick_some_of_choices(AI_NORMAL_MAX_CHOICES),
AIDifficulty::Hard => {
let mut utilities: Vec<(usize, f64)> = utilities.into_iter().enumerate().collect();
// shuffle utilities for the cases where there are equivalent utilities
if utilities.len() > 1 {
for i in 1..utilities.len() {
utilities.swap(i, thread_rng().gen_range(0..=i));
}
}
// only pick the best option all the time
let mut max = -1.0f64;
let mut max_idx: usize = 0;