docstr: Accumulate stats for a single batch
docstr_tok: ["Accumulate","stats","for","a","single","batch"]
code: def accumulate(self, preds):
      """Accumulate stats for a single batch"""
  
imports: from icevision.imports import *
label_desc: Use image node_id 2 for calling the Metric obj's underlying member method code with example usage: obj.accumulate(preds) without return types