[Relay][Topi] Use SimplifyInference for L2 Normalization.

python/tvm/relay/op/nn/_nn.py

@@ -611,22 +611,6 @@ def schedule_lrn(attrs, outs, target):
 reg.register_pattern("nn.lrn", OpPattern.OPAQUE)
 
 
-# l2_normalize
-@reg.register_compute("nn.l2_normalize")
-def compute_l2_normalize(attrs, inputs, out_dtype, target):
-    """Compute definition of l2 normalize"""
-    return [topi.nn.l2_normalize(inputs[0], attrs.eps, attrs.axis)]
-
-
-@reg.register_schedule("nn.l2_normalize")
-def schedule_l2_normalize(attrs, outs, target):
-    """Schedule definition of l2 normalize"""
-    with target:
-        return topi.generic.schedule_l2_normalize(outs)
-
-
-reg.register_pattern("nn.l2_normalize", OpPattern.OUT_ELEMWISE_FUSABLE)
-
 # upsampling
 reg.register_schedule("nn.upsampling", reg.schedule_injective)
 

src/relay/pass/pattern_util.h

@@ -397,6 +397,11 @@ inline Expr Divide(Expr lhs, Expr rhs) {
   return CallNode::make(op, {lhs, rhs}, Attrs(), {});
 }
 
+inline Expr Maximum(Expr lhs, Expr rhs) {
+  static const Op& op = Op::Get("maximum");
+  return CallNode::make(op, {lhs, rhs}, Attrs(), {});
+}
+
 inline Expr ZerosLike(Expr e) {
   static const Op& op = Op::Get("zeros_like");
   return CallNode::make(op, {e});

src/relay/pass/simplify_inference.cc

@@ -124,13 +124,26 @@ Expr InstanceNormToInferUnpack(const Attrs attrs,
   return out;
 }
 
+Expr L2NormToInferUnpack(const Attrs attrs, Expr data) {
+  const auto param = attrs.as<L2NormalizeAttrs>();
+  CHECK(param);
+
+  Expr epsilon = MakeConstantScalar(DataType::Float(32), static_cast<float>(param->eps));
+
+  Expr sqr = Multiply(data, data);
+  Expr sum = Maximum(Sum(sqr, param->axis, true, false), epsilon);
+  Expr sqrt = Sqrt(sum);
+  return Divide(data, sqrt);
+}
+
 class InferenceSimplifier : public ExprMutator {
  public:
   InferenceSimplifier()
       : batch_norm_op_(Op::Get("nn.batch_norm")),
         dropout_op_(Op::Get("nn.dropout")),
         instance_norm_op_(Op::Get("nn.instance_norm")),
-        layer_norm_op_(Op::Get("nn.layer_norm")) {}
+        layer_norm_op_(Op::Get("nn.layer_norm")),
+        l2_norm_op_(Op::Get("nn.l2_normalize")) {}
 
   Expr VisitExpr_(const TupleGetItemNode* n) final {
     Expr new_e = ExprMutator::VisitExpr_(n);
@@ -155,12 +168,15 @@ class InferenceSimplifier : public ExprMutator {
       ty_map_[new_n.as<CallNode>()->args[0]] = n->args[0]->checked_type();
     } else if (n->op == layer_norm_op_) {
       const auto* call = new_n.as<CallNode>();
-      return LayerNormToInferUnpack(call->attrs, call->args[0], call->args[1],
-                                    call->args[2], n->args[0]->checked_type());
+      return LayerNormToInferUnpack(call->attrs, call->args[0], call->args[1], call->args[2],
+                                    n->args[0]->checked_type());
     } else if (n->op == instance_norm_op_) {
       const auto* call = new_n.as<CallNode>();
-      return InstanceNormToInferUnpack(call->attrs, call->args[0], call->args[1],
-                                    call->args[2], n->args[0]->checked_type());
+      return InstanceNormToInferUnpack(call->attrs, call->args[0], call->args[1], call->args[2],
+                                       n->args[0]->checked_type());
+    } else if (n->op == l2_norm_op_) {
+      const auto* call = new_n.as<CallNode>();
+      return L2NormToInferUnpack(call->attrs, call->args[0]);
     }
     return new_n;
   }
@@ -173,6 +189,7 @@ class InferenceSimplifier : public ExprMutator {
   const Op& dropout_op_;
   const Op& instance_norm_op_;
   const Op& layer_norm_op_;
+  const Op& l2_norm_op_;
   std::unordered_map<Expr, Type, ObjectHash, ObjectEqual> ty_map_;
 };
 

topi/include/topi/cuda/normalization.h

@@ -71,55 +71,6 @@ inline Schedule schedule_lrn(const Target &target, const Array<Tensor>& outs) {
   return s;
 }
 
-/*!
-* \brief Create a CUDA schedule for L2 normalization
-*
-* \param target The target to generate a schedule for.
-* \param outs The output tensors.
-*
-* \return A schedule for the given ops.
-*/
-inline Schedule schedule_l2_normalize(const Target &target, const Array<Tensor>& outs) {
-  Array<Operation> out_ops;
-  for (auto t : outs) {
-    out_ops.push_back(t->op);
-  }
-  Schedule s = create_schedule(out_ops);
-
-  std::function<void(Operation)> traverse;
-  traverse = [&](const Operation& op) {
-    // Inline all one-to-one-mapping operators except the last stage (output)
-    if (is_injective(op->tag) || op->tag == "l2_normalize") {
-      if (!detail::contains(s->outputs, op)) {
-        s[op].compute_inline();
-      }
-      for (auto tensor : op->InputTensors()) {
-        if (tensor->op->InputTensors().size() > 0) {
-          traverse(tensor->op);
-        }
-      }
-    } else if (op->tag == "comm_reduce") {
-      ScheduleReduce(target, op, s, false);
-      for (auto tensor : op->InputTensors()) {
-        traverse(tensor->op);
-      }
-    } else {
-      LOG(ERROR) << "Unsupported operator " << op->tag;
-    }
-  };
-
-  traverse(outs[0]->op);
-  int num_thread = 64;
-  Tensor l2_normalize = outs[0];
-  IterVar block_x = tvm::te::thread_axis(Range(), "blockIdx.x");
-  IterVar thread_x = tvm::te::thread_axis(Range(0, num_thread), "threadIdx.x");
-  IterVar xto, xti;
-  s[l2_normalize].split_by_nparts(l2_normalize->op.as<ComputeOpNode>()->axis[1],
-                                 num_thread, &xto, &xti);
-  s[l2_normalize].bind(l2_normalize->op.as<ComputeOpNode>()->axis[0], block_x);
-  s[l2_normalize].bind(xto, thread_x);
-  return s;
-}
 }  // namespace cuda
 }  // namespace topi
 #endif  // TOPI_CUDA_NORMALIZATION_H_

topi/include/topi/rocm/normalization.h

@@ -44,17 +44,6 @@ inline Schedule schedule_lrn(const Target &target, const Array<Tensor>& outs) {
   return topi::cuda::schedule_lrn(target, outs);
 }
 
-/*!
-* \brief Create a rocm schedule for L2 Normalization
-*
-* \param target The target to generate a schedule for.
-* \param outs The output tensors.
-*
-* \return A schedule for the given ops.
-*/
-inline Schedule schedule_l2_normalize(const Target &target, const Array<Tensor>& outs) {
-  return topi::cuda::schedule_l2_normalize(target, outs);
-}
 }  // namespace rocm
 }  // namespace topi
 #endif  // TOPI_ROCM_NORMALIZATION_H_

topi/python/topi/cuda/__init__.py

@@ -31,7 +31,7 @@
 from .injective import schedule_injective, schedule_elemwise, schedule_broadcast
 from .dense import schedule_dense
 from .pooling import schedule_pool, schedule_adaptive_pool
-from .nn import schedule_lrn, schedule_l2_normalize
+from .nn import schedule_lrn
 from .batch_matmul import schedule_batch_matmul
 from .vision import *
 from . import ssd

topi/python/topi/cuda/nn.py

@@ -40,22 +40,3 @@ def schedule_lrn(outs):
     target = tvm.target.current_target(allow_none=False)
     cpp_target = cpp.TEST_create_target(target.target_name)
     return cpp.cuda.schedule_lrn(cpp_target, outs)
-
-@generic.schedule_l2_normalize.register(["cuda"])
-def schedule_l2_normalize(outs):
-    """Schedule for L2 normalize
-
-    Parameters
-    ----------
-    outs: Array of Tensor
-          The computation graph description of L2 normalize
-          in the format of an array of tensors.
-
-    Returns
-    -------
-    sch: Schedule
-        The computation schedule for the op.
-    """
-    target = tvm.target.current_target(allow_none=False)
-    cpp_target = cpp.TEST_create_target(target.target_name)
-    return cpp.cuda.schedule_l2_normalize(cpp_target, outs)

topi/python/topi/generic/nn.py

@@ -649,24 +649,6 @@ def schedule_lrn(outs):
     cpp_target = cpp.TEST_create_target(target.target_name)
     return cpp.generic.default_schedule(cpp_target, outs, False)
 
-@tvm.target.generic_func
-def schedule_l2_normalize(outs):
-    """Schedule for l2 normalize
-
-    Parameters
-    ----------
-    outs: Array of Tensor
-          The computation graph description of l2 normalize
-          in the format of an array of tensors.
-
-    Returns
-    -------
-    sch: Schedule
-        The computation schedule for the op.
-    """
-    target = tvm.target.current_target(allow_none=False)
-    cpp_target = cpp.TEST_create_target(target.target_name)
-    return cpp.generic.default_schedule(cpp_target, outs, False)
 
 @tvm.target.generic_func
 def schedule_sparse_dense(outs):

topi/python/topi/nn/__init__.py

@@ -38,7 +38,6 @@
 from .local_response_norm import *
 from .bitserial_conv2d import *
 from .bitserial_dense import *
-from .l2_normalize import *
 from .batch_matmul import *
 from .sparse import *
 from .pad import *

topi/python/topi/rocm/nn.py

@@ -26,9 +26,3 @@ def schedule_lrn(outs):
     target = tvm.target.current_target(allow_none=False)
     cpp_target = cpp.TEST_create_target(target.target_name)
     return cpp.rocm.schedule_lrn(cpp_target, outs)
-
-@generic.schedule_l2_normalize.register(["rocm", "gpu"])
-def schedule_l2_normalize(outs):
-    target = tvm.target.current_target(allow_none=False)
-    cpp_target = cpp.TEST_create_target(target.target_name)
-    return cpp.rocm.schedule_l2_normalize(cpp_target, outs)