code: def create_sample_dataframe(self):
      schema = t.StructType(
          [
              t.StructField("x", t.IntegerType(), nullable=True),
              t.StructField("yz", t.StringType(), nullable=True),
          ],
      )
  
      return sc.createDataFrame(
          [
              (1, "Bob"),
              (2, "Mandy"),
          ],
          schema,
      )
  
imports: import unittest
  from pyspark.sql import types, functions
  import synapse.ml.core.spark.functions
  from synapsemltest.spark import *
label_desc: Use image node_id 1 for calling the TemplateSpec obj's underlying member method code with example usage: obj.create_sample_dataframe() and returns: sc