code: def test_gpu_memory_allocation(self):
      falsey_values = ("0", "False", "false")
      preallocate = (
          os.environ.get("XLA_PYTHON_CLIENT_PREALLOCATE", "1")
          not in falsey_values
      )
      device = jax.devices()[0]
      mem_stats = device.memory_stats()
      self.assertEqual(mem_stats["pool_bytes"], 0)
      x = jax.lax.add(1, 2)
  
      mem_stats = device.memory_stats()
      if preallocate:
          self.assertEqual(
              mem_stats["pool_bytes"], mem_stats["bytes_limit"]
          )
      else:
          self.assertLessEqual(
              mem_stats["pool_bytes"], mem_stats["bytes_limit"] // 2
          )
  
file_path: jax/tests/gpu_memory_flags_test.py
imports: import os
  import sys
  import unittest
  from absl.testing import absltest
  import jax
  from jax._src import config
  from jax._src import test_util
  from jax._src.lib import xla_extension_version
label_desc: Use image node_id 1 for calling the GpuMemoryAllocationTest obj's underlying member method code with example usage: obj.test_gpu_memory_allocation() without return types