code: def testStdWithTensorInputs(self):
      tensor = [[1.0, 2.0, 2.0, 1.0], [10.0, 20.0, 20.0, 10.0]]
      expected = [0.5, 5.0]
      reduced = ragged_math_ops.reduce_std(tensor, axis=1)
      self.assertAllEqual(reduced, expected)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.eager import context
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_math_ops
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 9 for calling the RaggedReduceOpsTest obj's underlying member method code with example usage: obj.testStdWithTensorInputs() without return types