Python-related

Setup:

Install Python on Mac via brew: https://docs.python-guide.org/starting/install3/osx/ and set brew python as the default: https://stackoverflow.com/questions/5157678/how-do-i-use-brew-installed-python-as-the-default-python

Python virtual environment is detailed here.

ML model training tips are detailed here. 

super().__init__() instead of super(ChildB, self).__init__(): https://stackoverflow.com/questions/576169/understanding-python-super-with-init-methods

issues in loading pickle related to python versions incompatibility: https://stackoverflow.com/questions/11305790/pickle-incompatibility-of-numpy-arrays-between-python-2-and-3

Set the spacing between subplots discussed here. The position of the * edge of the subplots is a fraction of the figure width.

plt.subplots_adjust(left=0.1,

bottom=0.1,

right=0.9,

top=0.9,

wspace=0.4,

hspace=0.4)

plt.tight_layout() # for automatically maintaining the proper space between subplots

count nonzero in a numpy array: https://stackoverflow.com/questions/18395725/test-if-numpy-array-contains-only-zeros

converting an image from Image to (RGB) equal to convert the image to array.  The two images will be the same when we convert them back to Image type.

Two data structures for storing datasets: https://realpython.com/storing-images-in-python/

convert string to function: https://java2blog.com/python-string-to-function/

regex in python is discussed here,  A nice, brief tutorial is available here. 

sort in python https://stackoverflow.com/questions/7851077/how-to-return-index-of-a-sorted-list

How to change one char in a string: https://stackoverflow.com/questions/1228299/changing-one-character-in-a-string

Histogram for array: https://stackoverflow.com/questions/22159160/python-calculate-histogram-of-image

@ in python: https://stackoverflow.com/questions/6392739/what-does-the-at-symbol-do-in-python

heatmap on top of image: https://stackoverflow.com/questions/42481203/heatmap-on-top-of-image

colour maps: https://matplotlib.org/stable/tutorials/colors/colormaps.html

a[start:end:step], python slicing is explained here: https://stackoverflow.com/questions/509211/how-slicing-in-python-works

OpenCV-related:

Install: https://pypi.org/project/opencv-python/

contour: https://docs.opencv.org/4.x/d4/d73/tutorial_py_contours_begin.html

The image required to find.contour method: https://stackoverflow.com/questions/63698789/python-opencv-findcontours-error-cpp-197

convex hull: https://docs.opencv.org/4.x/d7/d1d/tutorial_hull.html

Image smoothing: https://docs.opencv.org/4.x/d4/d13/tutorial_py_filtering.html

Matplotlib colour: https://matplotlib.org/stable/gallery/color/named_colors.html

PyTorch:

backward hook: https://discuss.pytorch.org/t/how-to-modify-conv2d-input-gradients-using-backward-hook/132930/2

inplace in ReLU: https://discuss.pytorch.org/t/whats-the-difference-between-nn-relu-and-nn-relu-inplace-true/948

to(device): for nn.module or nn.Parameter, they will be automatically applied to 'to', for other attributes, they need to be incorporated manually by overriding the 'to' function

Make a customised distributed sampler: https://discuss.pytorch.org/t/how-to-implement-a-custom-distributed-sampler/151349

Install detectrion2: 

install python3_10 venv

pip3 install torch torchvision torchaudio

pip3 install 'git+https://github.com/facebookresearch/detectron2.git'

Install latest LVIS from github:  git clone https://github.com/lvis-dataset/lvis-api.git  cd lvis-api  pip install .