class_docstr: A pseudo sampler that does not do sampling actually.
class_docstr_tok: ["A","pseudo","sampler","that","does","not","do","sampling","actually","."]
docstr: Sample negative samples.
docstr_tok: ["Sample","negative","samples","."]
code: def _sample_neg(self, **kwargs):
      """Sample negative samples."""
      raise NotImplementedError
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import paddle
  from ppdet.core.workspace import register
label_desc: Use image node_id 3 for calling the PseudoSampler obj's underlying member method code with example usage: obj._sample_neg() without return types