text: import sys, platform, re, pytest
  from numpy.core._multiarray_umath import __cpu_features__
  
  def assert_features_equal(actual, desired, fname):
      __tracebackhide__ = True  # Hide traceback for py.test
      actual, desired = str(actual), str(desired)
      if actual == desired:
          return
      detected = str(__cpu_features__).replace("'", "")
      try:
          with open("/proc/cpuinfo", "r") as fd:
              cpuinfo = fd.read(2048)
      except Exception as err:
          cpuinfo = str(err)
  
      try:
          import subprocess
          auxv = subprocess.check_output(['/bin/true'], env=dict(LD_SHOW_AUXV="1"))
          auxv = auxv.decode()
      except Exception as err:
          auxv = str(err)
  
      import textwrap
      error_report = textwrap.indent(
  """
  ###########################################
  ### Extra debugging information
  ###########################################
  -------------------------------------------
  --- NumPy Detections
  -------------------------------------------
  %s
  -------------------------------------------
  --- SYS / CPUINFO
  -------------------------------------------
  %s....
  -------------------------------------------
  --- SYS / AUXV
  -------------------------------------------
  %s
  """ % (detected, cpuinfo, auxv), prefix='\r')
  
      raise AssertionError((
          "Failure Detection\n"
          " NAME: '%s'\n"
          " ACTUAL: %s\n"
          " DESIRED: %s\n"
          "%s"
      ) % (fname, actual, desired, error_report))
  
  class AbstractTest:
      features = []
      features_groups = {}
      features_map = {}
      features_flags = set()
  
      def load_flags(self):
          # a hook
          pass
      def test_features(self):
          self.load_flags()
          for gname, features in self.features_groups.items():
              test_features = [self.cpu_have(f) for f in features]
              assert_features_equal(__cpu_features__.get(gname), all(test_features), gname)
  
          for feature_name in self.features:
              cpu_have = self.cpu_have(feature_name)
              npy_have = __cpu_features__.get(feature_name)
              assert_features_equal(npy_have, cpu_have, feature_name)
  
      def cpu_have(self, feature_name):
          map_names = self.features_map.get(feature_name, feature_name)
          if isinstance(map_names, str):
              return map_names in self.features_flags
          for f in map_names:
              if f in self.features_flags:
                  return True
          return False
  
      def load_flags_cpuinfo(self, magic_key):
          self.features_flags = self.get_cpuinfo_item(magic_key)
  
      def get_cpuinfo_item(self, magic_key):
          values = set()
          with open('/proc/cpuinfo') as fd:
              for line in fd:
                  if not line.startswith(magic_key):
                      continue
                  flags_value = [s.strip() for s in line.split(':', 1)]
                  if len(flags_value) == 2:
                      values = values.union(flags_value[1].upper().split())
          return values
  
      def load_flags_auxv(self):
          import subprocess
          auxv = subprocess.check_output(['/bin/true'], env=dict(LD_SHOW_AUXV="1"))
          for at in auxv.split(b'\n'):
              if not at.startswith(b"AT_HWCAP"):
                  continue
              hwcap_value = [s.strip() for s in at.split(b':', 1)]
              if len(hwcap_value) == 2:
                  self.features_flags = self.features_flags.union(
                      hwcap_value[1].upper().decode().split()
                  )
  
  is_linux = sys.platform.startswith('linux')
  is_cygwin = sys.platform.startswith('cygwin')
  machine  = platform.machine()
  is_x86   = re.match("^(amd64|x86|i386|i686)", machine, re.IGNORECASE)
  @pytest.mark.skipif(
      not (is_linux or is_cygwin) or not is_x86, reason="Only for Linux and x86"
  )
  class Test_X86_Features(AbstractTest):
      features = [
          "MMX", "SSE", "SSE2", "SSE3", "SSSE3", "SSE41", "POPCNT", "SSE42",
          "AVX", "F16C", "XOP", "FMA4", "FMA3", "AVX2", "AVX512F", "AVX512CD",
          "AVX512ER", "AVX512PF", "AVX5124FMAPS", "AVX5124VNNIW", "AVX512VPOPCNTDQ",
          "AVX512VL", "AVX512BW", "AVX512DQ", "AVX512VNNI", "AVX512IFMA",
          "AVX512VBMI", "AVX512VBMI2", "AVX512BITALG",
      ]
      features_groups = dict(
          AVX512_KNL = ["AVX512F", "AVX512CD", "AVX512ER", "AVX512PF"],
          AVX512_KNM = ["AVX512F", "AVX512CD", "AVX512ER", "AVX512PF", "AVX5124FMAPS",
                        "AVX5124VNNIW", "AVX512VPOPCNTDQ"],
          AVX512_SKX = ["AVX512F", "AVX512CD", "AVX512BW", "AVX512DQ", "AVX512VL"],
          AVX512_CLX = ["AVX512F", "AVX512CD", "AVX512BW", "AVX512DQ", "AVX512VL", "AVX512VNNI"],
          AVX512_CNL = ["AVX512F", "AVX512CD", "AVX512BW", "AVX512DQ", "AVX512VL", "AVX512IFMA",
                        "AVX512VBMI"],
          AVX512_ICL = ["AVX512F", "AVX512CD", "AVX512BW", "AVX512DQ", "AVX512VL", "AVX512IFMA",
                        "AVX512VBMI", "AVX512VNNI", "AVX512VBMI2", "AVX512BITALG", "AVX512VPOPCNTDQ"],
      )
      features_map = dict(
          SSE3="PNI", SSE41="SSE4_1", SSE42="SSE4_2", FMA3="FMA",
          AVX512VNNI="AVX512_VNNI", AVX512BITALG="AVX512_BITALG", AVX512VBMI2="AVX512_VBMI2",
          AVX5124FMAPS="AVX512_4FMAPS", AVX5124VNNIW="AVX512_4VNNIW", AVX512VPOPCNTDQ="AVX512_VPOPCNTDQ",
      )
      def load_flags(self):
          self.load_flags_cpuinfo("flags")
  
  is_power = re.match("^(powerpc|ppc)64", machine, re.IGNORECASE)
  @pytest.mark.skipif(not is_linux or not is_power, reason="Only for Linux and Power")
  class Test_POWER_Features(AbstractTest):
      features = ["VSX", "VSX2", "VSX3"]
      features_map = dict(VSX2="ARCH_2_07", VSX3="ARCH_3_00")
  
      def load_flags(self):
          self.load_flags_auxv()
  
  is_arm = re.match("^(arm|aarch64)", machine, re.IGNORECASE)
  @pytest.mark.skipif(not is_linux or not is_arm, reason="Only for Linux and ARM")
  class Test_ARM_Features(AbstractTest):
      features = [
          "NEON", "ASIMD", "FPHP", "ASIMDHP", "ASIMDDP", "ASIMDFHM"
      ]
      features_groups = dict(
          NEON_FP16  = ["NEON", "HALF"],
          NEON_VFPV4 = ["NEON", "VFPV4"],
      )
      def load_flags(self):
          self.load_flags_cpuinfo("Features")
          arch = self.get_cpuinfo_item("CPU architecture")
          # in case of mounting virtual filesystem of aarch64 kernel
          is_rootfs_v8 = int('0'+next(iter(arch))) > 7 if arch else 0
          if  re.match("^(aarch64|AARCH64)", machine) or is_rootfs_v8:
              self.features_map = dict(
                  NEON="ASIMD", HALF="ASIMD", VFPV4="ASIMD"
              )
          else:
              self.features_map = dict(
                  # ELF auxiliary vector and /proc/cpuinfo on Linux kernel(armv8 aarch32)
                  # doesn't provide information about ASIMD, so we assume that ASIMD is supported
                  # if the kernel reports any one of the following ARM8 features.
                  ASIMD=("AES", "SHA1", "SHA2", "PMULL", "CRC32")
              )
  