code: def test_unary_callable_without_key(self):
      with self.assertRaises(ValueError):
          tabular.from_data(lambda i: i * i, size=10)
  
imports: import unittest
  import numpy
  import chainer
  from chainer.dataset import tabular
  from chainer import testing
label_desc: Use image node_id 8 for calling the TestFromData obj's underlying member method code with example usage: obj.test_unary_callable_without_key() without return types