Fixed resize of network for low resolution network like 128x128

src/detector.c

@@ -132,6 +132,8 @@ void train_detector(char *datacfg, char *cfgfile, char *weightfile, int *gpus, i
 			int random_val = rand() % 12;
 			int dim_w = (random_val + (init_w / 32 - 5)) * 32;	// +-160
 			int dim_h = (random_val + (init_h / 32 - 5)) * 32;	// +-160
+			if (dim_w < 32) dim_w = 32;
+			if (dim_h < 32) dim_h = 32;
 
 			printf("%d x %d \n", dim_w, dim_h);
 			args.w = dim_w;