[release/2.5] ModuleTracker: Add explicit garbage collection

[pragupta]

When running an FSDP model with FlopCounterMode, we are experiencing a memory leak. It is coming from ModuleTracker class. Even though ModuleTracker class is keeping weakrefrences of the operators, the tensors/operators are not being freed after the backward pass. To force free these tensors/operators after forward pass, I explicitly added garbage collection in the post forward hook.

(cherry picked from commit 63dc40d)

Fixes #ISSUE_NUMBER

[pruthvistony]

Not yet decided on cherry-picks into 2.5, so want to wait on this PR merge.

[rocm-mici]

Jenkins build for 328b01c325248ec56b34544b0f7ef3be914a5bb5 commit finished as FAILURE
Links: Blue Ocean view / Build artifacts

[rocm-mici]

Jenkins build for 328b01c325248ec56b34544b0f7ef3be914a5bb5 commit finished as FAILURE
Links: Blue Ocean view / Build artifacts

[rocm-mici]

Jenkins build for 328b01c325248ec56b34544b0f7ef3be914a5bb5 commit finished as FAILURE
Links: Blue Ocean view / Build artifacts

[rocm-mici]

Jenkins build for 328b01c325248ec56b34544b0f7ef3be914a5bb5 commit finished as FAILURE
Links: Blue Ocean view / Build artifacts

Detected error during Pytorch building:

   93 | __global__ void unrolled_elementwise_kernel(
      |                 ^
/var/lib/jenkins/pytorch/aten/src/ATen/native/hip/HIPLoops.cuh:93:17: warning: loop not unrolled: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering [-Wpass-failed=transform-warning]
180 warnings generated when compiling for gfx942.
[8009/8668] Building HIPCC object caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/torch_hip_generated_flash_api.hip.o
FAILED: caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/torch_hip_generated_flash_api.hip.o /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/torch_hip_generated_flash_api.hip.o 
cd /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn && /opt/conda/envs/py_3.10/bin/cmake -E make_directory /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/. && /opt/conda/envs/py_3.10/bin/cmake -D verbose:BOOL=OFF -D build_configuration:STRING=RELEASE -D generated_file:STRING=/var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/./torch_hip_generated_flash_api.hip.o -P /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/torch_hip_generated_flash_api.hip.o.cmake
In file included from /var/lib/jenkins/pytorch/aten/src/ATen/native/transformers/hip/flash_attn/flash_api.hip:57:
/var/lib/jenkins/pytorch/aten/src/ATen/native/transformers/hip/aotriton_adapter.h:120:10: error: no matching constructor for initialization of 'aotriton::TensorView<0>'
  120 |   return aotriton::TensorView<0>(reinterpret_cast<intptr_t>(q.data_ptr()),
      |          ^                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[rocm-mici]

Jenkins build for 328b01c325248ec56b34544b0f7ef3be914a5bb5 commit finished as FAILURE
Links: Blue Ocean view / Build artifacts

Detected error during Pytorch building:

      |                 ^
48 warnings generated when compiling for gfx942.
[8010/8668] Building HIPCC object caffe2/CMakeFiles/torch_hip.dir/__/torch/csrc/distributed/c10d/torch_hip_generated_CUDASymmetricMemoryOps.cu.o
[8011/8668] Linking CXX static library lib/libunbox_lib.a
[8012/8668] Building HIPCC object caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/torch_hip_generated_flash_api.hip.o
FAILED: caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/torch_hip_generated_flash_api.hip.o /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/torch_hip_generated_flash_api.hip.o 
cd /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn && /opt/conda/envs/py_3.10/bin/cmake -E make_directory /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/. && /opt/conda/envs/py_3.10/bin/cmake -D verbose:BOOL=OFF -D build_configuration:STRING=RELEASE -D generated_file:STRING=/var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/./torch_hip_generated_flash_api.hip.o -P /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/torch_hip_generated_flash_api.hip.o.cmake
In file included from /var/lib/jenkins/pytorch/aten/src/ATen/native/transformers/hip/flash_attn/flash_api.hip:57:
/var/lib/jenkins/pytorch/aten/src/ATen/native/transformers/hip/aotriton_adapter.h:120:10: error: no matching constructor for initialization of 'aotriton::TensorView<0>'
  120 |   return aotriton::TensorView<0>(reinterpret_cast<intptr_t>(q.data_ptr()),
      |          ^                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[rocm-mici]

Jenkins build for 328b01c325248ec56b34544b0f7ef3be914a5bb5 commit finished as FAILURE
Links: Blue Ocean view / Build artifacts

Detected error during Pytorch building:

  580 | #define DEPRECATED(msg) __attribute__ ((deprecated(msg)))
      |                                         ^
1 warning generated when compiling for gfx908.
[8005/8668] Building HIPCC object caffe2/CMakeFiles/torch_hip.dir/__/torch/csrc/distributed/c10d/torch_hip_generated_CUDASymmetricMemoryOps.cu.o
[8006/8668] Building HIPCC object caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/torch_hip_generated_flash_api.hip.o
FAILED: caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/torch_hip_generated_flash_api.hip.o /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/torch_hip_generated_flash_api.hip.o 
cd /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn && /opt/conda/envs/py_3.10/bin/cmake -E make_directory /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/. && /opt/conda/envs/py_3.10/bin/cmake -D verbose:BOOL=OFF -D build_configuration:STRING=RELEASE -D generated_file:STRING=/var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/./torch_hip_generated_flash_api.hip.o -P /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/flash_attn/torch_hip_generated_flash_api.hip.o.cmake
In file included from /var/lib/jenkins/pytorch/aten/src/ATen/native/transformers/hip/flash_attn/flash_api.hip:57:
/var/lib/jenkins/pytorch/aten/src/ATen/native/transformers/hip/aotriton_adapter.h:120:10: error: no matching constructor for initialization of 'aotriton::TensorView<0>'
  120 |   return aotriton::TensorView<0>(reinterpret_cast<intptr_t>(q.data_ptr()),
      |          ^                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[rocm-mici]

Jenkins build for 328b01c325248ec56b34544b0f7ef3be914a5bb5 commit finished as FAILURE
Links: Blue Ocean view / Build artifacts

Detected error during Pytorch building:

[7970/8668] Building HIPCC object caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/hip/torch_hip_generated_modified_bessel_k1.hip.o
[7971/8668] Building HIPCC object caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/hip/torch_hip_generated_shifted_chebyshev_polynomial_u.hip.o
[7972/8668] Building HIPCC object caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/hip/torch_hip_generated_scaled_modified_bessel_k0.hip.o
[7973/8668] Building HIPCC object caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/hip/torch_hip_generated_shifted_chebyshev_polynomial_v.hip.o
[7974/8668] Building HIPCC object caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/torch_hip_generated_attention_backward.hip.o
FAILED: caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/torch_hip_generated_attention_backward.hip.o /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/torch_hip_generated_attention_backward.hip.o 
cd /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip && /opt/conda/envs/py_3.10/bin/cmake -E make_directory /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/. && /opt/conda/envs/py_3.10/bin/cmake -D verbose:BOOL=OFF -D build_configuration:STRING=RELEASE -D generated_file:STRING=/var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/./torch_hip_generated_attention_backward.hip.o -P /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/native/transformers/hip/torch_hip_generated_attention_backward.hip.o.cmake
In file included from /var/lib/jenkins/pytorch/aten/src/ATen/native/transformers/hip/attention_backward.hip:49:
/var/lib/jenkins/pytorch/aten/src/ATen/native/transformers/hip/aotriton_adapter.h:120:10: error: no matching constructor for initialization of 'aotriton::TensorView<0>'
  120 |   return aotriton::TensorView<0>(reinterpret_cast<intptr_t>(q.data_ptr()),
      |          ^                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~