docstr: Calls interpolate function for vectors.
docstr_tok: ["Calls","interpolate","function","for","vectors","."]
code: def _vector_slerp_helper(self, q1, q2, p):
      """Calls interpolate function for vectors."""
      return slerp.interpolate(
          q1, q2, p, slerp.InterpolationType.VECTOR
      )
  
imports: from absl.testing import parameterized
  import numpy
  import tensorflow
  from tensorflow_graphics.math.interpolation import slerp
  from tensorflow_graphics.util import test_case
label_desc: Use image node_id 3 for calling the SlerpTest obj's underlying member method code with example usage: obj._vector_slerp_helper(q1, q2, p) and returns: slerp