code: def float_index(self, dtype):
      return Index([0.0, 2.5, 5.0, 7.5, 10.0], dtype=dtype)
  
imports: import numpy
  import pytest
  import pandas
  from pandas import Index, Series
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestFloatNumericIndex obj's underlying member method code with example usage: obj.float_index(dtype) and returns: Index