Future Blog Post

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This post will show up by default. To disable scheduling of future posts, edit config.yml and set future: false.

Yank to Clipboard in VIM/

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General yank: y

Fedora Gets Stuck after Nvidia Driver and CUDA Installed

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After installing Nvidia Driver and CUDA on a Nvidia Optimus laptop (following instructions on if-not-true-then-false), Fedora (34+) often gets stuck after several minutes poweron.

GIMP

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GIMP, notable software for image processing in linux

Useful Shell Commands

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Count number of fiels in a dir

• ls | wc -l, all regular files/folders just in this dir
• ls -a | grep ^\\. | wc -l, all hidden files/folders just in thid dir
• tree -L 1, list tree just in this dir, and count number of files and folders respectively
• find ./ -maxdepth 1 -type f,d | wc -l, but will match current dir and hidden files/folders

Explanations in Neural Networks

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Interpretability (of a DNN) is the ability to provide explanations in understandable terms to a human. F Doshi-Velez & B Kim, 2017。

Causality preliminary

2 minute read

This is an reading notes from an causality introduction website

basis for convex optimization

1 minute read

Notable Concepts

• line / (closed) line segments: \theta * x1 + (1 - \theta) * x2, theta in R / in [0, 1]
• affine set / convex set: \theta * x1 + (1 - \theta) * x2, theta in R / in [0, 1]
• cone: theta * x, theta in R+ (nonnegative real values)
• hyperplane / halfspace: a^T x = b or a^T (x - x0) = 0 / a^T x < b, a^T x > b or a^T (x - x0) < 0, a^T (x - x0) > 0
• balls / ellipsoids: (x - xc)^T P (x - xc) <= r^2 , P = I or other kinds of positive definite solution.
• polyhedron: the solution set of a finite number of linear equalities and inequalities
• simplex: conv hull of k+1 affinely independent points, and its affine dimensionality is k. such as line segment, triangle (with interior), tetrahedron (with interior). As well as, unit simplex (x >= 0, 1^T * x <= 1), or probability simplex (x >= 0, 1^T * x = 1)
• partial order, minimum (最小, for each s in S, s <= s0, or, S included in s0+K), minimal (极小, if s in S s.t. s<= s0, then s = s0, or, Intersection(so-K, S) = {x} )
• supporting hyperplane

Common CV Tasks

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Common tasks in computer vision:

• recognition
• classification, image class labels
• localization, per-object bounding box labels
• detection, per-object class+bounding box labels
• tracking
• semantic segmentation, per-pixel class labels (all pixels, but do not distinct objects with the same class label)
• instance segmentation, per-object mask and class labels (only objects)
• panoptic segmentation, per-pixel class+instance labels (objects and background things)

Cache and buffer in computer science

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Cache is a smaller and fast memory component in the computer which is inserted between the CPU and the main memory.

Unzip file with name in Chinese

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unzip -O CP936 <my_zip_file>.zip this piece of code could unzip files with Chinese names, and do not output a mess!

Notes

2 minute read

Known persons in statistics learning

• Judea Pearl, Bayesian networks, and causality
• Geoffrey Hinton, backpropagation, deep belief networks
• Michael Jordan, popularize probability graphical models
• Yann Lecun, convolutional neural networks
• Yoshua Bengio, neural machine translation

PDF compressing and splitting

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Uploading files might encount size limitation, in which case files need to be compressed and/or split. Here is an effective and easy way in Fedora.

Tmux - Awesome Tool for Efficient Work

1 minute read

This is about tmux — Terminal Multiplexer for newbies such as me.

Awesome Features in Libreoffice

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Today, I found some awesome shortcuts to insert special characters in LibreOffice (LO).