[英]Weighted average of dictionary values in python
I have a grid of parameters which is composed of 234 dictionaries, everyone having the same keys. 我有一个由234个词典组成的参数网格,每个词典都有相同的键。 Then I have a list of weights through which I want to compute a weighted average of such dictionaries' values. 然后,我有一个权重列表,通过这些权重列表,我可以计算出这些字典值的加权平均值。 In other words I need to obtin just one dictionary that has the same keys of the initial 243, but as values attached to each keys a weighted average of values, using the 243 weights. 换句话说,我只需要处理一个字典,它具有与初始243相同的键,但是作为附加到每个键上的值,需要使用243权重进行加权平均。
I tried to use Counter
in order to cumulate results, but it returns very small values that do not make sense to me. 我尝试使用Counter
来累积结果,但是它返回的值非常小,对我来说没有意义。 w[0]
is the list of 243 weights, each of them related to 243 dictionaries inside grid
w[0]
是243个权重的列表,每个权重与grid
内的243个词典有关
from collections import Counter
def avg_grid(grid, w, labels=["V0", "omega", "kappa", "rho", "theta"]):
avgHeston = Counter({label: 0 for label in labels})
for i in range(len(grid)):
avgHeston.update(Counter({label: grid[i][label] * w[0][i] for label in labels}))
totPar = dict(avgHeston)
return totPar
Is there an easier way to implement it? 有没有更容易实现的方法?
You might want to use a defaultdict
instead: 您可能要改用defaultdict
:
from collections import defaultdict
def avg_grid(grid, wgts, labels=["V0", "rho"]):
avgHeston = defaultdict(int)
for g,w in zip(grid, wgts):
for label in labels:
avgHeston[label] += g[label] * w
return avgHeston
weights = [4,3]
grd = [{'V0':4,'rho':3}, {'V0':1,'rho':2}]
print(avg_grid(grd, weights))
Output: 输出:
defaultdict(<class 'int'>, {'V0': 19, 'rho': 18})
Notes: 笔记:
I have changed w
so that you need to pass in a straight list. 我更改了w
以便您需要直接输入清单。 You might want to call the function like this: avg_grid(grids, w[0])
您可能想要这样调用函数: avg_grid(grids, w[0])
Also this doesn't produce an average as such. 同样,这不会产生平均值。 you may want to do a divide by len(grid)
at some point. 您可能需要在某个时候除以len(grid)
。
Also for g,w in zip(grid, wgts):
is a more pythonic iteration 也for g,w in zip(grid, wgts):
是更具Python风格的迭代
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