no clue

[jijibn]

im=im*255;
im2=im:clone()
im2[{{3},{},{}}]=im[{{1},{},{}}]-123.68
im2[{{2},{},{}}]=im[{{2},{},{}}]-116.779
im2[{{1},{},{}}]=im[{{3},{},{}}]-103.939

hello,
could someone plz explain to me this part of the code

[utkarshojha]

That is one of the image preprocessing step usually done, especially before feeding images into most of the convolutional neural networks people use these days. This may not make much intuitive sense right now, but such preprocessing helps network undergo a better training process