class_docstr: Each record should contain the following fields:
  feature: List[List[float]].
  label: float.
  index: long.
class_docstr_tok: ["Each","record","should","contain","the","following","fields",":","feature",":","List","[","List","[","float","]","]",".","label",":","float",".","index",":","long","."]
code: def __str__(self):
      return "FeatureLableIndex [feature: %s, label: %s, index: %s]" % (
          self.feature,
          self.label,
          self.index,
      )
  
imports: import warnings
  from zoo.pipeline.api.keras.models import Sequential
  from zoo.pipeline.api.keras.layers import *
  from zoo.models.common import *
  from zoo.common.utils import callZooFunc
  from bigdl.util.common import Sample
label_desc: Use image node_id 3 for calling the FeatureLableIndex obj's underlying member method code with example usage: obj.__str__() and returns: unknown