code: def _get_lr_at_iter(alpha, lr_warmup_factor=1.0 / 3.0):
      return lr_warmup_factor * (1 - alpha) + alpha
  
file_path: gluon-cv/gluoncv/auto/estimators/faster_rcnn/utils.py
imports: import os
  from mxnet import gluon
  from ....data.batchify import FasterRCNNTrainBatchify, Tuple, Append
  from ....data.sampler import SplitSortedBucketSampler
  from ....data.transforms.presets.rcnn import FasterRCNNDefaultValTransform
  from ....None import data
  from ....utils.metrics.coco_detection import COCODetectionMetric
  from ....utils.metrics.voc_detection import VOC07MApMetric
label_desc: Use image node_id 1 for calling a global function with example usage: _get_lr_at_iter(alpha, lr_warmup_factor) and returns: unknown