class_docstr: A Term that should be loaded from an external resource by a PipelineLoader.
  
  This is the base class for :class:`catalyst.pipeline.data.BoundColumn`.
class_docstr_tok: ["A","Term","that","should","be","loaded","from","an","external","resource","by","a","PipelineLoader",".","This","is","the","base","class","for",":","class",":","`","catalyst.pipeline.data.BoundColumn","`","."]
code: def dependencies(self):
      return {self.mask: 0}
  
imports: from abc import ABCMeta, abstractproperty
  from bisect import insort
  from collections import Mapping
  from weakref import WeakValueDictionary
  from numpy import array, dtype, ndarray, searchsorted
  from six import with_metaclass
  from catalyst.assets import Asset
  from catalyst.errors import DTypeNotSpecified, InvalidOutputName, NonExistentAssetInTimeFrame, NonSliceableTerm, NonWindowSafeInput, NotDType, TermInputsNotSpecified, TermOutputsEmpty, UnsupportedDType, WindowLengthNotSpecified
  from catalyst.lib.adjusted_array import can_represent_dtype
  from catalyst.lib.labelarray import LabelArray
  from catalyst.utils.input_validation import expect_types
  from catalyst.utils.memoize import lazyval
  from catalyst.utils.numpy_utils import bool_dtype, categorical_dtype, datetime64ns_dtype, default_missing_value_for_dtype
  from catalyst.utils.sharedoc import templated_docstring, PIPELINE_ALIAS_NAME_DOC, PIPELINE_DOWNSAMPLING_FREQUENCY_DOC
  from .downsample_helpers import expect_downsample_frequency
  from .sentinels import NotSpecified
label_desc: Use image node_id 1 for calling the LoadableTerm obj's underlying member method code with example usage: obj.dependencies() and returns: dict