A question about anchors

[frankTian92]

Sorry to bother you. As a beginner, I have been confused by the setting of numbers of anchors. In cfg, IS_MULTISCALE = False, and __C.TRAIN.ASPECTS = (1, 0.75, 0.5, 0.25) was commented. Why choosing A = len() * 3 as the numbers of anchors in lib/networks/VGGnet_train.py in line 51-54?

[Benzlxs]

Actually, author didn't use scale parameters in config.py like _C.TRAIN.ASPECTS and _C.TRAIN.SCALE.

The method that author employ to change the number and scale of anchor is pretty hard-coding.
You can check the code below

TFFRCNN/lib/rpn_msr/anchor_target_layer.py

Line 33 in 27e4a78

self._anchors = generate_anchors(cfg.TRAIN.RPN_BASE_SIZE, cfg.TRAIN.RPN_ASPECTS, cfg.TRAIN.RPN_SCALES)

TFFRCNN/lib/rpn_msr/generate_anchors.py

Line 37 in 27e4a78

def generate_anchors(base_size=16, ratios=[0.5, 1, 2],

A = len() * 3 is also little bit hard-code, 3 is fixed, but it should depend on scale ratio