ankane

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

• They are the people who get things done. Effective Engineers produce results.

Adopt the Right Mindsets

ankane

require "bundler/inline"

gemfile do
  source "https://rubygems.org"

  gem "activerecord", require: "active_record"
  gem "activejob", require: "active_job"
  gem "sqlite3"
  gem "searchkick", git: "https://github.com/ankane/searchkick.git"
end

ankane

#include <stdio.h>
#include <inttypes.h>
#include <math.h>

// Function, which calculates N, p and r from opslimit and memslimit copied from
// libsodium/crypto_pwhash/scryptsalsa208sha256/pwhash_scryptsalsa208sha256.c
int pickparams(unsigned long long opslimit, const size_t memlimit,
        uint32_t *const N_log2, uint32_t *const p, uint32_t *const r) {
    unsigned long long maxN;
    unsigned long long maxrp;

ankane

Devise email change notifications with encrypted attributes in Rails 5.2

Add to the Devise initializer:

config.send_email_changed_notification = true

Use this PR for attr_encrypted

ankane

require "onnxruntime"
require "mini_magick"

img = MiniMagick::Image.open("bears.jpg")
pixels = img.get_pixels

model = OnnxRuntime::Model.new("model.onnx")
result = model.predict({"inputs" => [pixels]})

p result["num_detections"]

ankane

require "onnxruntime"
require "mini_magick"
require "numo/narray"

img = MiniMagick::Image.open("images/32576677167_a066c5a7aa_z.jpg")
img.resize "448x448^", "-gravity", "center", "-extent", "448x448"

pixels = Numo::NArray[*img.get_pixels]
pixels = pixels.transpose(2, 0, 1)
pixels = pixels.expand_dims(0)

ankane

# https://github.com/onnx/models/tree/master/vision/body_analysis/emotion_ferplus
require "onnxruntime"
require "mini_magick"

img = MiniMagick::Image.open("ranger.jpg")
img.crop "100x100+60+20", "-gravity", "center"
img.resize "64x64^", "-gravity", "center", "-extent", "64x64"
img.colorspace "Gray"
img.write("resized.jpg")

ankane

# Bootstrap AWS Deep Learning Base AMI (Ubuntu 18.04)

# install Ruby
sudo snap install ruby --classic

# install LibTorch
wget -O libtorch.zip https://download.pytorch.org/libtorch/cu102/libtorch-cxx11-abi-shared-with-deps-1.7.0.zip
unzip libtorch.zip

# download

ankane

ankane

require "bundler/inline"

gemfile do
  source "https://rubygems.org"

  gem "activerecord", require: "active_record"
  gem "sqlite3"
  gem "lockbox", git: "https://github.com/ankane/lockbox.git"
end