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.mean() on ArrayView1<u64>: panicked at 'attempt to add with overflow'

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难度
3/5
预计耗时
1-2 天
新手友好度
42/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
rust
领域
data

调研方向

Start by running the provided Rust example and inspect the ndarray implementations of mean() and sum(), since the report identifies their likely interaction. Determine how mean should behave when summing u64 values beyond that type's range, then verify that the reproduction no longer panics and still returns the expected mean.

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描述

enhancement

I wanted to calculate a mean over an ArrayView1<u64> with 1000 values and encounter a panic:
thread 'main' panicked at 'attempt to add with overflow', /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/core/src/ops/arith.rs:107:1

Is this intended? Or should the u64 values internally be casted to u128 when calculating the mean?
The following code reproduces the error:

use ndarray::*;

fn main() {
    let mut data_vec: Vec<u64> = Vec::new();
    for _ in 1..1000 {
        data_vec.push(132542363533234561)
    }
    let data = data_vec.as_slice();
    let view: ArrayView1<u64> = ArrayView1::from_shape(data.len(), data).unwrap();
    println!("{:?}", view.mean());
}

I think the reason for this error is that mean() uses the public sum() function, which panics if the result does not fit into the element type. However, the mean result should always fit into the element type, so mean() maybe shouldn't use the public sum() function.

主要语言
Rust
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30 天内没有已合并 PR

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