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Matthijs Hollemans hollance

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hollance / Button.cpp
Created Dec 24, 2020
Arduino push button debouncing
View Button.cpp
#include "Button.h"
Button::Button() : _pin(0), _oldState(0) {
}
void Button::attach(byte pin) {
_pin = pin;
pinMode(_pin, INPUT);
}
@hollance
hollance / workaround.markdown
Created Oct 9, 2020
Workaround for Xcode 12 problems with Core ML models
View workaround.markdown

I ran into a problem with Xcode 12's Core ML compiler, and several people have emailed me about what appears to be the same issue.

The workaround is to use Xcode 11 to compile the Core ML model. This means you still need to have Xcode 11 installed (which is a good idea anyway).

What worked for me is the following...

From the Terminal, switch to the Xcode 11.7 installation (your path may be different):

sudo xcode-select -s /Applications/Xcode11.7.app/Contents/Developer/
View ARC.ipynb
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View cluetrain.txt
A few years after my stint in Japan, I ended up back in the United
States, hired by an AI software outfit to be their director of corporate
communications. Cool, I thought. That sounded important. I had no idea
what it meant. Only later did I discover I'd become their PR guy.
Bummer.
I was pretty naive back then, but I quickly figured out that public
relations was perceived by the press — the people I was supposed to be
talking to — as little more than thinly disguised hucksterism. I tried
playing the high-tech huckster role precisely once and came away from
@hollance
hollance / CoreML+Combine.swift
Created Nov 12, 2019
Using Core ML with Combine
View CoreML+Combine.swift
import CoreML
import Combine
extension Publisher where Self.Output: MLFeatureProvider {
/**
Operator that lets you run a Core ML model as part of a Combine chain.
It accepts an MLFeatureProvider object as input, and, if all goes well,
returns another MLFeatureProvider with the model outputs.
View convert_weights.py
# Convert SE-ResNet-50 from Caffe to Keras
# Using the model from https://github.com/shicai/SENet-Caffe
import os
import numpy as np
# The caffe module needs to be on the Python path; we'll add it here explicitly.
import sys
caffe_root = "/path/to/caffe"
sys.path.insert(0, caffe_root + "python")
@hollance
hollance / Compressing-MobileNet.ipynb
Created Sep 26, 2017
Jupyter notebook for compressing MobileNet (work in progress)
View Compressing-MobileNet.ipynb
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View Shaders.metal
#include <metal_stdlib>
using namespace metal;
struct Relu6Params {
float a;
};
kernel void relu6(
texture2d_array<half, access::read> inTexture [[texture(0)]],
texture2d_array<half, access::write> outTexture [[texture(1)]],
View Sketch.ipynb
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@hollance
hollance / deconv.py
Created May 13, 2017
Playing with "deconvolution"
View deconv.py
import numpy as np
i = np.array(list(range(1, 50)), dtype=np.float).reshape((7, 7))
k = np.array(list(range(1, 10)), dtype=np.float).reshape((3, 3))
print("Input:"); print(i)
print("Kernel:"); print(k)
# Forward convolution. We need to pad the input so that we can read from
# its borders. (Not doing stride etc here.)