OS-specific code in run_midas.py and run_flows_video.py

[sirisian]

I'm running your program from Windows and I noticed a few things.

Very minor, but I needed to install tensorboard as a dependency that isn't listed in the README in order to train.

On lines https://github.com/zhengqili/Neural-Scene-Flow-Fields/blob/main/nsff_scripts/run_midas.py#L84 and 104 you have linux commands for copying and removing files.

I don't know python, but import shutil and this sounded right:

        src_files = os.listdir(imgdir_orig)
        for file_name in src_files:
            full_file_name = os.path.join(imgdir_orig, file_name)
            if os.path.isfile(full_file_name):
                shutil.copy(full_file_name, imgdir)

Also https://github.com/zhengqili/Neural-Scene-Flow-Fields/blob/main/nsff_scripts/run_flows_video.py#L218 and 219 use rm.

shutil.rmtree(mask_dir)
shutil.rmtree(semantic_dir)

When run_flows_video.py runs it puts the motion masks into the image directory. If I copy them to the motion_masks folder then copy the images_512x288 images to the images directory I can begin training. (Assuming that's where they're supposed to be). I'm training on a single 3090, so this might take a while. (I turned off the NaN detection in the recent pull request which seems to have sped things up quite a bit).