TypeError:迭代 0-d 数组 Python

2022-01-10 00:00:00 python numpy arrays typeerror iterator

问题描述

我正在尝试编写一个非常基本的最近邻计算.我基本上想看看 t 的样子，但我得到了这种类型的错误.当我要求功能返回时，它说".当我要求它转入列表时，它抛出TypeError:迭代 0-d 数组 Python"

I am trying to write a very basic nearest neighbor calculation. I basically want to see what t looks like but I got this type error. When I asked the funciton to return just t it said "". When I asked it to turn to list it threw "TypeError: iteration over a 0-d array Python "

请问我该如何解决这个问题?

How do I fix this please?

...

t = np.array(map(lambda v:
             map(lambda w: distance(v, w, L), x_train.values),
             x_test.values)) 

...

完整的跟踪:

解决方案

问题是np.array不带迭代器，需要先转换成list，如下:

The problem is np.array does not take an iterator, you need convert to list first, as below:

t = np.array(list(map(lambda v: map(lambda w: distance(v, w, L),
                      x_train.values), x_test.values)))

根据 numpy.array 文档，必填参数必须是:

As per numpy.array documentation, the required parameter must be:

一个数组，任何暴露数组接口的对象，一个对象array 方法返回一个数组，或任何(嵌套)序列.

An array, any object exposing the array interface, an object whose array method returns an array, or any (nested) sequence.

或者，使用 numpy.fromiter 并记得提供 dtype，例如dtype=float.

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