Remove meta linear operation in cpp.

Differential Revision: D79401818

Pull Request resolved: #2731

Author: szyszyzys

torchao/experimental/ops/groupwise_lowbit_weight_lut/op_groupwise_lowbit_weight_lut-impl.h

@@ -104,30 +104,6 @@ Tensor linear_cpu(
 }
 #endif // USE_ATEN
 
-#ifdef USE_ATEN
-template <int weight_nbit>
-at::Tensor linear_meta(
-    const at::Tensor& activations,
-    const at::Tensor& packed_weights,
-    const int64_t& scale_group_size,
-    const int64_t& lut_group_size,
-    const int64_t& n,
-    const int64_t& k) {
-  auto input_sizes = activations.sizes().vec();
-  TORCH_CHECK(
-      !input_sizes.empty() && input_sizes.back() == k,
-      "The last dimension of `activations` is ",
-      input_sizes.back(),
-      " but it must be equal to k=",
-      k);
-
-  auto output_sizes = input_sizes;
-  output_sizes.back() = n;
-
-  return at::empty(output_sizes, activations.options());
-}
-#endif // USE_ATEN
-
 #ifdef USE_ATEN
 template <int weight_nbit>
 Tensor pack_weights_with_lut_cpu(

torchao/experimental/ops/groupwise_lowbit_weight_lut/op_groupwise_lowbit_weight_lut_aten.cpp

@@ -37,12 +37,6 @@
       "_linear_groupwise_" #weight_nbit "bit_weight_with_lut.out", \
       &linear_out_cpu<weight_nbit>);
 
-#define DEFINE_LINEAR_META_IMPL(weight_nbit)                     \
-  m.impl(                                                \
-      "_linear_groupwise_" #weight_nbit "bit_weight_with_lut",     \
-      &linear_meta<weight_nbit>);                         \
-
-
 TORCH_LIBRARY_FRAGMENT(torchao, m) {
   DEFINE_PACK_OP(1);
   DEFINE_PACK_OP(2);
@@ -72,9 +66,4 @@ TORCH_LIBRARY_IMPL(torchao, Meta, m) {
   DEFINE_PACK_META_IMPL(2);
   DEFINE_PACK_META_IMPL(3);
   DEFINE_PACK_META_IMPL(4);
-
-  DEFINE_LINEAR_META_IMPL(1);
-  DEFINE_LINEAR_META_IMPL(2);
-  DEFINE_LINEAR_META_IMPL(3);
-  DEFINE_LINEAR_META_IMPL(4);
 }