code: def test_ndim(self):
      assert Tensor(1).ndim == 0
      assert Tensor.randn(1).ndim == 1
      assert Tensor.randn(2, 2, 2).ndim == 3
      assert Tensor.randn(1, 1, 1, 1, 1, 1).ndim == 6
  
imports: import numpy
  import torch
  import unittest, copy
  import mmap
  from tinygrad import Tensor, Device, dtypes
  from tinygrad.helpers import temp
  from extra.gradcheck import numerical_jacobian, jacobian, gradcheck
label_desc: Use image node_id 13 for calling the TestTinygrad obj's underlying member method code with example usage: obj.test_ndim() without return types