def nearestNeighbor(trainingSet, testRow, classCol, k):
minHeap = MinHeap(len(trainingSet.index))
for row in trainingSet.iterrows():
dropRow = row[1].drop(classCol)
dist = findDistance(dropRow, testRow, classCol)
minHeap.insert((row, dist))
minHeap.minHeap()
# Determine class by k neighbor voting
votes = {}
for i in range(k):
minVal = minHeap.remove()
if minVal[0][1][classCol] in votes:
votes[minVal[0][1][classCol]] += 1
else:
votes[minVal[0][1][classCol]] = 1
maxVotes = 0
predictedClass = ""
for key in votes:
if votes[key] > maxVotes:
maxVotes = votes[key]
predictedClass = key
return 0 if (predictedClass == testRow[1][classCol]) else 1
def dijkstraFindPath(self,
startPoint,
endPoint,
pointsInPath,
checkLineIntersection=False,
searchRange=DEFAULT_SEARCH_RANGE):
# pre-calculate distances in a search range cube
self.gridScanDistances = []
for k in range(-searchRange, searchRange + 1):
grid2dDistances = []
for i in range(-searchRange, searchRange + 1):
tmp = []
for j in range(-searchRange, searchRange + 1):
tmp.append((i**2 + (j * LENGTH / WIDTH)**2 +
(k * LENGTH / HEIGHT)**2)**0.5)
grid2dDistances.append(tmp)
self.gridScanDistances.append(grid2dDistances)
self.grid[startPoint[2]][startPoint[1]][startPoint[0]].setDistance(0)
pq = MinHeap()
pq.insert(
self.grid[startPoint[2]][startPoint[1]][startPoint[0]], self.grid[
startPoint[2]][startPoint[1]][startPoint[0]].getDistance())
count = 0
while pq.counter != 0:
currGridPoint = pq.del_min()
if currGridPoint.getDistance(
) > LARGE_DISTANCE: # these are the points that cannot be reached from the start point
print("points covered: " + str(count))
print("Destination point cannot be reached")
raise Exception()
break
currGridPoint.visit()
currX = currGridPoint.x
currY = currGridPoint.y
currZ = currGridPoint.z
if (
currX, currY
) == endPoint: # if we've reached the endpoint, then its okay to stop
break
# go through all the neighbours of the current point
for k in range(-searchRange, searchRange + 1):
z = k + currZ
for i in range(-searchRange, searchRange + 1):
y = i + currY
for j in range(-searchRange, searchRange + 1):
x = j + currX
if x < 0 or x >= WIDTH or y < 0 or y >= LENGTH or z < 0 or z >= HEIGHT: # check if out of bounds
continue
# check if point has been visited and whether it is accessible or not
currPoint = self.grid[z][y][x]
if currPoint.beenVisited(
) or not currPoint.isAccessible():
continue
if checkLineIntersection: # option that adds a shitton of time to the algo
line = LineString([[currX, currY], [x, y]])
continueFlag = False
for noFlyZone in self.noFlyZones:
if line.intersects(noFlyZone):
continueFlag = True
break
if continueFlag:
continue
oldDist = currPoint.getDistance()
newDist = currGridPoint.getDistance(
) + self.gridScanDistances[k + searchRange][
i + searchRange][j + searchRange]
if newDist < oldDist:
currPoint.setDistance(newDist)
pq.insert(currPoint, currPoint.getDistance())
currPoint.setParent(currGridPoint)
count = count + 1
# check if the endpoint has actually been visited (probs not necessary but why not)
endGridPoint = self.grid[endPoint[2]][endPoint[1]][endPoint[0]]
if endGridPoint.getDistance() > LARGE_DISTANCE:
print("no path could be found")
raise Exception()
return
# now find the shortest path by going up the tree
startGridPoint = self.grid[startPoint[2]][startPoint[1]][startPoint[0]]
tempPath = []
while endGridPoint != startGridPoint:
if endGridPoint == None:
print("no path could be found between following two points: ",
end="")
print(startPoint, end="")
print(endPoint)
raise Exception()
return
tempPath.append((endGridPoint.x, endGridPoint.y, endGridPoint.z))
endGridPoint = endGridPoint.getParent()
tempPath.append((startGridPoint.x, startGridPoint.y, endGridPoint.z))
totalDistance = 0
# reverse them, append onto list then calculate distance
for x in range(len(tempPath) - 2, -1, -1):
totalDistance = totalDistance + (
abs(tempPath[x + 1][0] - tempPath[x][0])**2 +
abs(tempPath[x + 1][1] - tempPath[x][1])**2 +
abs(tempPath[x + 1][2] - tempPath[x][2])**2)**0.5
pointsInPath.append(tempPath[x])
self.gridReset()
return totalDistance
# Add, edit, or remove tests in this file.
# Treat it as your playground!
from minHeap import MinHeap
import unittest
test1 = MinHeap([2, 3, 1])
test2 = MinHeap([1, 2, 3, 4, 5, 6, 7, 8, 9])
test3 = MinHeap([48, 12, 24, 7, 8, -5, 24, 391, 24, 56, 2, 6, 8, 41])
test3.insert(76)
test3.remove()
test3.remove()
test3.insert(87)
test3a = MinHeap([[1, 48], [1, 12], [1, 24], [1, 7], [1, 8], [1, -5], [1, 24],
[1, 39], [1, 24], [1, 56], [1, 2], [1, 6], [1, 8], [1, 41]])
test3a.insert([1, 76])
test3a.remove()
test3a.remove()
test3a.insert([1, 9])
test3a.insert([1, 10])
test3a.insert([1, 87])
test3a.insert([1, -87])
test3a.insert([1, 49])
test4 = MinHeap(
[-4, 5, 10, 8, -10, -6, -4, -2, -5, 3, 5, -4, -5, -1, 1, 6, -7, -6, -7, 8])
test5 = MinHeap(
