class_docstr: padding image for model with FPN, instead PadBatch(pad_to_stride) in original config
  Args:
      stride (bool): model with FPN need image shape % stride == 0
code: def __init__(self, stride=0):
      self.coarsest_stride = stride
  
imports: import base64
  import cv2
  import numpy
  from .keypoint_preprocess import get_affine_transform
label_desc: Use image node_id 1 to create a new PadStride object from inherited base classes: object with example: obj = PadStride(stride)