[fix] align the default anchor_generator config of Anchor3DHead with the Anchor3DRangeGenerator specification

[wyhallenwu]

Motivation

I'm new to mmdetection3d. When I try to leverage mmdetection3d's anchor head module in my own project, I found there is a mismatch in the default config value of Anchor3DRangeGenerator( in mmdet3d/models/dense_heads/anchor3d_head.py) and the Anchor3DRangeGenerator ( in mmdet3d/models/task_modules/anchor/anchor_3d_generator.py).

Modification

Before modification, the default init value of Anchor3DRangeGenerator is as follows (line 55-62 in mmdet3d/models/dense_heads/anchor3d_head.py ):

             anchor_generator: ConfigType = dict(
                 type='Anchor3DRangeGenerator',
                 range=[0, -39.68, -1.78, 69.12, 39.68, -1.78],
                 strides=[2],
                 sizes=[[3.9, 1.6, 1.56]],
                 rotations=[0, 1.57],
                 custom_values=[],
                 reshape_out=False),

The __init__value of Anchor3DRangeGenerator is as follows: ( line 43 -49 in mmdet3d/models/task_modules/anchor/anchor_3d_generator.py)
ranges: List[List[float]],
sizes: List[List[float]] = [[3.9, 1.6, 1.56]],
scales: List[int] = [1],
rotations: List[float] = [0, 1.5707963],
custom_values: Tuple[float] = (),
reshape_out: bool = True,
size_per_range: bool = True) -> None:

Specifically, I correct the default init anchor_generator value of anchor_generator (the fomer one) to match with the definition of the Anchor3DRangeGenerator.

After modified,

             anchor_generator: ConfigType = dict(
                 type='Anchor3DRangeGenerator',
                 ranges=[[0, -39.68, -1.78, 69.12, 39.68, -1.78]],
                 sizes=[[3.9, 1.6, 1.56]],
                 scales=[1],
                 rotations=[0, 1.57],
                 custom_values=(),
                 reshape_out=True,
                 size_per_range=True),

Thank you for all developers for creating such a wonderful work! This work really helps my research.
I'm willing to join this community and contribute more in the future!

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