matrix   6074

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Matrix Calculus
"MatrixCalculus provides matrix calculus for everyone. It is an online tool that computes vector and matrix derivatives (matrix calculus)."
webapps  calculus  matrix 
yesterday by arsyed
GitHub - emilyxxie/matrix_vision: Matrix Cam: see yourself inside the Matrix!
GitHub is where people build software. More than 27 million people use GitHub to discover, fork, and contribute to over 80 million projects.
5 days ago by jarhead
[1803.01422] DAGs with NO TEARS: Smooth Optimization for Structure Learning
Estimating the structure of directed acyclic graphs (DAGs, also known as Bayesian networks) is a challenging problem since the search space of DAGs is combinatorial and scales superexponentially with the number of nodes. Existing approaches rely on various local heuristics for enforcing the acyclicity constraint and are not well-suited to general purpose optimization packages for their solution. In this paper, we introduce a fundamentally different strategy: We formulate the structure learning problem as a smooth, constrained optimization problem over real matrices that avoids this combinatorial constraint entirely. This is achieved by a novel characterization of acyclicity that is not only smooth but also exact. The resulting nonconvex, constrained program involves smooth functions whose gradients are easy to compute and only involve elementary matrix operations. By using existing black-box optimization routines, our method uses global search to find an optimal DAG and can be implemented in about 50 lines of Python and outperforms existing methods without imposing any structural constraints.
ML  graph  matrix  optimization 
6 days ago by nprnncbl
hzeller/rpi-rgb-led-matrix: Controlling up to three chains of 32x32 or 16x32 RGB LED displays using Raspberry Pi GPIO
GitHub is where people build software. More than 27 million people use GitHub to discover, fork, and contribute to over 80 million projects.
IO18  raspi  LED  matrix  github 
8 days ago by ashwath22
Membrane 3x4 Matrix Keypad + extras
This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. It's made of a thin, flexible membrane material with an adhesive backing (just remove the paper) so you can attach it to nearly anything.
embedded  keypad  adafruit  matrix  raspberrypi  arduino 
9 days ago by cyberchucktx
Interrupt-based matrix keypad library for Raspberry Pi
An interrupt-based Python 2/3 library for reading matrix keypad key presses using Raspberry Pi GPIO pins.
raspberrypi  keypad  matrix  telephone  python 
9 days ago by cyberchucktx

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