Remove CPU support for lars_sgd (pytorch#1774)

Summary:
Pull Request resolved: pytorch#1774

This diff is a part of FBGEMM TBE optimizer deprecation plan (see
pytorch#1727)

Changes include:
- Setting `has_cpu_support` of `lars_sgd` to
  `False` in the code gen script
- Updating `codegen/TARGETS` and `CMakeLists.txt`

See D45835048 for how the changes affect the code generation

Reviewed By: q10, csmiler

Differential Revision: D45845181

fbshipit-source-id: 1e1b9d8f97b118d986d32cfd65909ba0d4923246

fbgemm_gpu/CMakeLists.txt

@@ -162,7 +162,6 @@ file(GLOB_RECURSE asmjit_sources
 
 set(COMMON_OPTIMIZERS
     adagrad
-    lars_sgd
     partial_rowwise_adam
     partial_rowwise_lamb
     rowwise_adagrad
@@ -176,6 +175,7 @@ set(CPU_ONLY_OPTIMIZERS "")
 set(GPU_ONLY_OPTIMIZERS
   adam
   lamb
+  lars_sgd
   rowwise_adagrad_with_weight_decay
   approx_rowwise_adagrad_with_weight_decay)
 

fbgemm_gpu/codegen/embedding_backward_code_generator.py

@@ -1344,7 +1344,7 @@ def lars_sgd() -> None:
         split_precomputation=split_precomputation,
         split_weight_update=split_weight_update,
         split_weight_update_cpu=split_weight_update_cpu,
-        has_cpu_support=True,
+        has_cpu_support=False,
         has_gpu_support=True,
         has_vbe_support=False,
     )