class_docstr: Factory class to create a csr_matrix.
          
code: def __init__(self, dtype=np.int32):
      self.rows = []
      self.cols = []
      self.data = []
      self._max_col = 0
      self._max_row = 0
      self._dtype = dtype
  
file_path: scattertext/scattertext/CSRMatrixTools.py
imports: import numpy
  from scipy.sparse import csr_matrix
label_desc: Use image node_id 1 to create a new CSRMatrixFactory object  with example: obj = CSRMatrixFactory(dtype)