numpy.nanmean — NumPy v1.22 Manual ¶. ¶. In this method, we will calculate our weighted average and create a numpy array. nanmean (a, axis=None, dtype=None, out=None, keepdims=) [source] ¶ Return the sum of array elements over a given axis treating Not a Numbers (NaNs) as zero. numpy.nanstd — NumPy v1.24.dev0 Manual numpy.nanstd — NumPy v1.22 Manual Returns the standard deviation, a measure of the spread of a distribution, of the non-NaN array elements. df.where(cond, other_df), it will return an object of same shape as df and whose corresponding entries are from df where the corresponding element of cond is True and otherwise are taken … python - Perform numpy operation with None/NaN in array - Stack … Using numpy library as “import numpy as np”. Array containing numbers whose sum is desired. New in version 1.9.0. The nan stands for “not a number“, and its primary constant is to act as a placeholder for any missing numerical values in the array. I will check whether there is any way to make NumPy understand that nan±… should be treated like nan by nanmean (). numpy 和 pytorch 中，对空的 tensor 取 sum 是 0，取 mean 是 NaN！对此，numpy 会报 Runtime Warning，而 pytorch 却没有一丝提示… 对张量用 mask 之后可能会产生空的 tensor（即 mask 全是 False 没有 True），可能之前训练 loss 都正常，突然就 NaN 了。所以取 mean 前先判空。

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