cp /workspace/scratch/matting.py /workspace/scratch/matting1.py; python - <<'PY'
p='/workspace/scratch/matting.py';s=open(p).read();s=s.replace('B=b+delta[bi[0],bi[1]]','B=b');s=s.replace("alpha[fg]=1;alpha[bg]=0","alpha[fg]=1;alpha[bg]=0\n # floor / room difference under 8-bit noise is not coverage\n unchanged=np.linalg.norm(a-b,axis=2)<.008\n alpha[unchanged & ~fg]=0")
open(p,'w').write(s)
PY
OPENBLAS_NUM_THREADS=1 python /workspace/scratch/matting.py