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Installing OpenCV 3.1 on Raspbian Jessie

Prerequisites

• Keep your system up to date:
  • $ sudo apt-get update
  • $ sudo apt-get upgrade
  • $ sudo reboot
• Make sure you've got an internet connection.
• Make sure you've got
• wget

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def relative_symlink(target: Union[Path, str], destination: Union[Path, str]):
    """Create a symlink pointing to ``target`` from ``location``.

    Args:
        target: The target of the symlink (the file/directory that is pointed to)
        destination: The location of the symlink itself.
    """
    target = Path(target)
    destination = Path(destination)
    target_dir = destination.parent

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Kinetics Numeric/String labels

These are mapping files that go between class IDs to class names. These are generated from the training CSV files from each dataset by collecting the unique classes, sorting them, and then numbering them from 0 upwards.

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Find the node assigned to a job

$ sacct -j <jobid> --format NodeList
       NodeList
---------------
         dgj213
         dgj213

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import numpy as np
from PIL import Image

def vstack(images):
    if len(images) == 0:
        raise ValueError("Need 0 or more images")

    if isinstance(images[0], np.ndarray):
        images = [Image.fromarray(img) for img in images]
    width = max([img.size[0] for img in images])

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Install OpenCV 4.1.2 on Raspbian Buster

$ chmod +x *.sh
$ ./download-opencv.sh
$ ./install-deps.sh
$ ./build-opencv.sh
$ cd ~/opencv/opencv-4.1.2/build
$ sudo make install

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# Ruby is our language as asciidoctor is a ruby gem.
lang: ruby
before_install:
  - sudo apt-get install pandoc
  - gem install asciidoctor
script:
  - make
after_success:
  - .travis/push.sh
env:

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Arch install notes

Boot loader

• Create a separate boot partition, arch manual suggests using ESP as boot partition but this leads to headaches.
• Skip the autodetect functionality of refind and use a manual stanza
• Ensure you change the volume entry in refind's boot stanza to the label of your boot device.

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from io import BytesIO

import av
import numpy as np


def video_array_to_mp4_blob(video: np.ndarray, fps: float = 24) -> bytes:
    """
    Args:
        video: Video array of shape :math:`(T, H, W, 3)` and range :math:`[0, 255]` with type ``np.uint8``.

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PBS Pro command cheat sheet

List nodes and their features

$ pbsnodes

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