code: def testStringConversion(self):
      self.assertIs(dtypes.float32, dtypes.as_dtype("float32"))
      self.assertIs(dtypes.float64, dtypes.as_dtype("float64"))
      self.assertIs(dtypes.int32, dtypes.as_dtype("int32"))
      self.assertIs(dtypes.uint8, dtypes.as_dtype("uint8"))
      self.assertIs(dtypes.uint16, dtypes.as_dtype("uint16"))
      self.assertIs(dtypes.int16, dtypes.as_dtype("int16"))
      self.assertIs(dtypes.int8, dtypes.as_dtype("int8"))
      self.assertIs(dtypes.string, dtypes.as_dtype("string"))
      self.assertIs(dtypes.complex64, dtypes.as_dtype("complex64"))
      self.assertIs(dtypes.complex128, dtypes.as_dtype("complex128"))
      self.assertIs(dtypes.int64, dtypes.as_dtype("int64"))
      self.assertIs(dtypes.bool, dtypes.as_dtype("bool"))
      self.assertIs(dtypes.qint8, dtypes.as_dtype("qint8"))
      self.assertIs(dtypes.quint8, dtypes.as_dtype("quint8"))
      self.assertIs(dtypes.qint32, dtypes.as_dtype("qint32"))
      self.assertIs(dtypes.bfloat16, dtypes.as_dtype("bfloat16"))
      self.assertIs(dtypes.float8_e5m2, dtypes.as_dtype("float8_e5m2"))
      self.assertIs(
          dtypes.float8_e4m3fn, dtypes.as_dtype("float8_e4m3fn")
      )
      self.assertIs(dtypes.int4, dtypes.as_dtype("int4"))
      self.assertIs(dtypes.uint4, dtypes.as_dtype("uint4"))
      self.assertIs(dtypes.float32_ref, dtypes.as_dtype("float32_ref"))
      self.assertIs(dtypes.float64_ref, dtypes.as_dtype("float64_ref"))
      self.assertIs(dtypes.int32_ref, dtypes.as_dtype("int32_ref"))
      self.assertIs(dtypes.uint8_ref, dtypes.as_dtype("uint8_ref"))
      self.assertIs(dtypes.int16_ref, dtypes.as_dtype("int16_ref"))
      self.assertIs(dtypes.int8_ref, dtypes.as_dtype("int8_ref"))
      self.assertIs(dtypes.string_ref, dtypes.as_dtype("string_ref"))
      self.assertIs(
          dtypes.complex64_ref, dtypes.as_dtype("complex64_ref")
      )
      self.assertIs(
          dtypes.complex128_ref, dtypes.as_dtype("complex128_ref")
      )
      self.assertIs(dtypes.int64_ref, dtypes.as_dtype("int64_ref"))
      self.assertIs(dtypes.bool_ref, dtypes.as_dtype("bool_ref"))
      self.assertIs(dtypes.qint8_ref, dtypes.as_dtype("qint8_ref"))
      self.assertIs(dtypes.quint8_ref, dtypes.as_dtype("quint8_ref"))
      self.assertIs(dtypes.qint32_ref, dtypes.as_dtype("qint32_ref"))
      self.assertIs(
          dtypes.bfloat16_ref, dtypes.as_dtype("bfloat16_ref")
      )
      self.assertIs(
          dtypes.float8_e5m2_ref, dtypes.as_dtype("float8_e5m2_ref")
      )
      self.assertIs(
          dtypes.float8_e4m3fn_ref, dtypes.as_dtype("float8_e4m3fn_ref")
      )
      self.assertIs(dtypes.int4_ref, dtypes.as_dtype("int4_ref"))
      self.assertIs(dtypes.uint4_ref, dtypes.as_dtype("uint4_ref"))
      with self.assertRaises(TypeError):
          dtypes.as_dtype("not_a_type")
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.framework import _dtypes
  from tensorflow.core.framework import types_pb2
  from tensorflow.core.function import trace_type
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 8 for calling the TypesTest obj's underlying member method code with example usage: obj.testStringConversion() without return types