Cityscapes inference about efficientps

[mohan1914]

-Ln 49 and 50 define the color palette in tools/cityscapes_save_predictions.py which is defined for the 18 (stuff and thing classes). You will have to first define a color palette of maybe 256 (or even 30 should be enough depending on the image or you can run np.unique to find the total number of instances+stuff_classes pan_pred has)

-remove lines from 70-71 to 75-83 and 86
modify ln 72 and 73 as
pan_pred = pan_pred.numpy()
panoptic_col[pan_pred==0] = colors.shape[0] - 1
panoptic_col = Image.fromarray(colors[panoptic_col])
(assuming the colors array last row stores the void pixel color)

-replace sem_img with panoptic_col in Ln 85 with panoptic_col

[gmvincent]

@mohan1914 Do you have suggestions on how to properly define the palette?