[英]PuLP slow when adding many constraints
我不確定已實施的補丁程序能否真正解決問題。 我指的是:
“實際上僅通過使用該類的iadd就允許“ + =”
有什么更新嗎? 有人可以提供此代碼的“更快”版本嗎?
import pulp
vars = pulp.LpVariable.dicts("var",range(1000),0,None,pulp.LpContinuous)
coeffs = range(1000)
expr = pulp.LpAffineExpression()
import time
start_time = time.time()
for n in range(1000): #Ten times building an expression of 1000 elements
#print n
for i in range(1000): # 1000 elements
expr += coeffs[i] * vars[i]
print("--- %s seconds ---" % (time.time() - start_time))
謝謝
這應該更快
import pulp
vars = pulp.LpVariable.dicts("var",range(1000),0,None,pulp.LpContinuous)
coeffs = range(1000)
import time
start_time = time.time()
for n in range(1000): #Ten times building an expression of 1000 elements
#print n
pulp.lpSum([coeffs[i] * vars[i] for i in range(1000)])
print("--- %s seconds ---" % (time.time() - start_time))
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