class_docstr: Turn a transformed real-valued array into a hash
class_docstr_tok: ["Turn","a","transformed","real-valued","array","into","a","hash"]
code: def fit_transform(self, X, y=None):
      self.fit(X)
      return self.transform(X)
  
imports: import numpy
  import warnings
  from scipy import sparse
  from .base import KNeighborsMixin, RadiusNeighborsMixin
  from ..base import BaseEstimator
  from ..utils.validation import check_array
  from ..utils import check_random_state
  from ..metrics.pairwise import pairwise_distances
  from ..random_projection import GaussianRandomProjection
label_desc: Use image node_id 2 for calling the ProjectionToHashMixin obj's underlying member method code with example usage: obj.fit_transform(X, y) and returns: self