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Yuta Okamoto okapies

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@okapies
okapies / has_no_attr.py
Last active October 2, 2021 10:14
hasattr returns False for an object whose __get__ throws AttributeError.
class A:
pass
class B:
def __get__(self, instance, cls=None):
raise AttributeError()
class C:
a = A()
b = B()
@okapies
okapies / build-opencv-for-pyenv.py
Last active September 5, 2021 11:42 — forked from pohmelie/build-opencv-for-pyenv.py
Build opencv for ubuntu 16.04 with pyenv
import getpass
import os
import pathlib
import sys
import sh
BASE_DIR = os.path.abspath(os.path.join(__file__, '..'))
OPENCV_VERSION = '4.5.2'
@okapies
okapies / dataclass_util.py
Created March 12, 2021 03:11
Construct a dataclass from a dict with unexpected keys
from dataclasses import asdict, fields
from typing import Any, Dict
class DataClassBase:
@classmethod
def fromdict(cls, d: Dict[str, Any]):
"""Return a dataclass from a dict which may include unexpected keys."""
class_fields = {f.name for f in fields(cls)}
return cls(**{k: v for k, v in d.items() if k in class_fields})
@okapies
okapies / gen_text.py
Last active June 18, 2020 03:07
Japanese text generator using Markov chain algorithm
# -*- coding: utf-8 -*-
# ref. https://qiita.com/k-jimon/items/f02fae75e853a9c02127
from collections import deque, defaultdict, Counter
from itertools import chain, islice, takewhile
import MeCab
import os
import random
import re
@okapies
okapies / CachedContext.js
Last active June 4, 2020 16:43
A custom React Context persisting its state to localStorage
// The original idea comes from a post by Alex Krush.
// https://medium.com/@akrush95/global-cached-state-in-react-using-hooks-context-and-local-storage-166eacf8ab46
import React, { useCallback, useEffect, useReducer, useRef } from 'react';
export const createCachedContext = ({ storageKey, defaultValue }) => {
const initializer = (initialState) => {
const localState = localStorage.getItem(storageKey);
if (localState) {
try {
@okapies
okapies / INSTALL.md
Last active May 29, 2024 16:11
How to install akvcam on Ubuntu 18.04

Install DKMS

$ apt install dkms

Prepare for signing kernel modules

TODO

Install

Download the source code.

@okapies
okapies / csg_to_dxf.py
Last active February 18, 2021 20:22
A converter script from OpenSCAD's .csg or .scad to .dxf using FreeCAD
# -*- coding: utf-8 -*-
import FreeCAD
import importCSG
import importDXF
def csg_to_dxf(src, dst):
doc = importCSG.open(src)
importDXF.export([doc.TopologicalSortedObjects[0]], dst) # assumes it has single root object
FreeCAD.closeDocument(doc.Name)
@okapies
okapies / train_mnist_logreport.py
Created June 12, 2019 03:21
A customized train_mnist example to measure the performance of extension
#!/usr/bin/env python
import argparse
import chainer
import chainer.functions as F
import chainer.links as L
from chainer import training
from chainer.training import extensions
import numpy as np
@okapies
okapies / np_array_order.py
Last active March 20, 2019 01:43
How `numpy.array(order='F')` works
>>> np.array([[[0, 4], [2, 6]], [[1, 5], [3, 7]]], dtype='b')
array([[[0, 4],
[2, 6]],
[[1, 5],
[3, 7]]], dtype=int8)
>>> ctypes.string_at(np.array([[[0, 4], [2, 6]], [[1, 5], [3, 7]]], dtype='b').ctypes.data, 8) # .data.tobytes() doesn't work properly
b'\x00\x04\x02\x06\x01\x05\x03\x07'
>>> np.array([[[0, 4], [2, 6]], [[1, 5], [3, 7]]], dtype='b').__array_interface__
{'data': (23426096, False), 'strides': None, 'descr': [('', '|i1')], 'typestr': '|i1', 'shape': (2, 2, 2), 'version': 3}
>>> np.array([[[0, 4], [2, 6]], [[1, 5], [3, 7]]], dtype='b').flags
@okapies
okapies / xp_nested_array-usage.md
Last active June 12, 2019 06:33
A performance evaluation of creating a (numpy|cupy) array from nested arrays 
$ python xp_nested_array.py --src-xp numpy --dst-xp numpy --shape "(3, 224, 224)" --batch-size 10
Shape: (3, 224, 224)
Batch size: 10
Running numpy.array(<List[numpy.ndarray]>) in 10000 times...
3.857709832955152