## NumPy Where: Understanding np.where()

Posted 2021-03-03 • Last updated 2021-10-19The NumPy where function is like a vectorized switch that you can use to combine two arrays.

The NumPy where function is like a vectorized switch that you can use to combine two arrays.

You can find the mode of an empirical continuous distribution by plotting the histogram and looking for the maximum bin.

The np.all() function tests whether all elements in a NumPy array evaluate to true.

A simple NumPy implementation of the binary cross entropy loss function and some intuition about why it works.

Pandas provides a .query() method on DataFrame’s with a convenient string syntax for filtering DataFrames. This post describes the method and gives simple usage examples.

It’s easy to linearly interpolate a 1-dimensional set of points in Python using the np.interp() function from NumPy.

You can create multi-dimensional coordinate arrays using the np.meshgrid() function, which is also available in PyTorch and TensorFlow. But watch out! PyTorch uses different indexing by default so the results might not be the same.

A step-by-step quick start guide for SageMaker Studio. Start a Studio session, launch a notebook on a GPU instance and run object detection inference with a detectron2 pre-trained model.

PyTorch has a one_hot() function for converting class indices to one-hot encoded targets.

The np.pad() function has a complex, powerful API. But basic usage is very simple and complex usage is achievable! This post shows you how to use NumPy pad and gives a couple examples.