[RELAY][VM] Add shape_of instruction

include/tvm/runtime/vm.h

@@ -114,6 +114,7 @@ enum class Opcode {
   LoadConsti = 14U,
   Fatal = 15U,
   AllocStorage = 16U,
+  ShapeOf = 17U,
 };
 
 /*! \brief A single virtual machine instruction.
@@ -245,6 +246,9 @@ struct Instruction {
       /*! \brief The hint of the dtype. */
       DLDataType dtype_hint;
     } alloc_storage;
+    struct /* ShapeOf Operands */ {
+      RegName tensor;
+    } shape_of;
   };
 
   /*!
@@ -389,6 +393,14 @@ struct Instruction {
   static Instruction AllocStorage(RegName size, RegName alignment, DLDataType dtype_hint,
                                   RegName dst);
 
+  /*!
+   * \brief Get the shape of an input tensor.
+   * \param tensor The input tensor.
+   * \param dst The destination to store the shape of the given tensor.
+   * \return The shape of instruction.
+   */
+  static Instruction ShapeOf(RegName tensor, RegName dst);
+
   Instruction();
   Instruction(const Instruction& instr);
   Instruction& operator=(const Instruction& instr);

python/tvm/relay/op/__init__.py

@@ -27,6 +27,7 @@
 from .tensor import *
 from .transform import *
 from .algorithm import *
+from .vm import *
 from . import nn
 from . import annotation
 from . import memory

python/tvm/relay/op/vm/__init__.py

@@ -0,0 +1,20 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# pylint: disable=wildcard-import
+"""Dialect operators for Relay VM."""
+from __future__ import absolute_import as _abs
+from . import vm

python/tvm/relay/op/vm/_ffi_api.py

@@ -0,0 +1,20 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""FFI APIs for relay.op.vm"""
+import tvm._ffi
+
+tvm._ffi._init_api("relay.op.vm", __name__)

python/tvm/relay/op/vm/vm.py

@@ -0,0 +1,35 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# pylint: disable=no-else-return,invalid-name,len-as-condition,too-many-nested-blocks
+"""Dialect operators for Relay VM."""
+from . import _ffi_api
+
+
+def shape_of(expr):
+    """Invoke a function to get the shape of a tensor.
+
+    Parameters
+    ----------
+    expr : tvm.relay.Expr
+        The expr used to evaluate its tensor shape.
+
+    Returns
+    -------
+    result : tvm.relay.Expr
+        The expression with the evaluated tensor shape.
+    """
+    return _ffi_api.shape_of(expr)

python/tvm/relay/transform/memory_alloc.py

@@ -44,6 +44,7 @@ class ManifestAllocPass(ExprMutator):
     def __init__(self, target_host):
         self.invoke_tvm = op.memory.invoke_tvm_op
         self.shape_func = op.memory.shape_func
+        self.shape_of = op.vm.shape_of
         self.scopes = [ScopeBuilder()]
         self.target_host = target_host
         self.default_context = cpu(0)
@@ -53,9 +54,6 @@ def __init__(self, target_host):
     def current_scope(self):
         return self.scopes[-1]
 
-    def shape_of(self, e):
-        return op.shape_of(e, self.compute_dtype)
-
     def visit_tuple(self, tup):
         scope = self.current_scope()
         new_fields = []

src/relay/backend/vm/compiler.cc

@@ -279,6 +279,7 @@ class VMFunctionCompiler : ExprFunctor<void(const Expr& expr)> {
       case Opcode::Invoke:
       case Opcode::AllocClosure:
       case Opcode::AllocStorage:
+      case Opcode::ShapeOf:
       case Opcode::Move:
       case Opcode::InvokeClosure:
         last_register_ = instr.dst;
@@ -584,6 +585,18 @@ class VMFunctionCompiler : ExprFunctor<void(const Expr& expr)> {
                    auto outputs = Downcast<Tuple>(args[2]);
                    EmitShapeFunc(shape_func, inputs->fields, outputs->fields);
                  })
+          .Match("vm.shape_of",
+                 [this](const Array<Expr>& args, const Attrs& attrs, const Array<Type>& type_arg) {
+                   CHECK_EQ(args.size(), 1U);
+                   // Get the attributes.
+                   const auto* shape_of_attrs = attrs.as<ShapeOfAttrs>();
+                   CHECK(shape_of_attrs) << "Must be the shape_of attrs";
+                   CHECK_EQ(shape_of_attrs->dtype.bits(), 64)
+                       << "The dtype of shape of must be int64, but got"
+                       << DLDataType2String(shape_of_attrs->dtype);
+                   this->VisitExpr(args[0]);
+                   Emit(Instruction::ShapeOf(last_register_, NewRegister()));
+                 })
           .Match("memory.kill",
                  [](const Array<Expr>& args, const Attrs& attrs, const Array<Type>& type_arg) {
                    LOG(FATAL) << "memory.kill is not yet supported";

src/relay/op/tensor/unary.cc

@@ -396,20 +396,6 @@ RELAY_REGISTER_UNARY_OP("bitwise_not")
 // shape_of
 TVM_REGISTER_NODE_TYPE(ShapeOfAttrs);
 
-bool ShapeOfRel(const Array<Type>& types, int num_inputs, const Attrs& attrs,
-                const TypeReporter& reporter) {
-  CHECK_EQ(num_inputs, 1);
-  auto tt = types[0].as<TensorTypeNode>();
-  if (tt == nullptr) {
-    return false;
-  }
-  const auto* param = attrs.as<ShapeOfAttrs>();
-  CHECK(param != nullptr);
-  auto rank_shape = RankShape(tt->shape);
-  reporter->Assign(types[1], TensorType(rank_shape, param->dtype));
-  return true;
-}
-
 Array<te::Tensor> ShapeOfCompute(const Attrs& attrs, const Array<te::Tensor>& inputs,
                                  const Type& out_type) {
   CHECK_EQ(inputs.size(), 1);

src/relay/op/type_relations.cc

@@ -25,6 +25,7 @@
 #include "./type_relations.h"
 
 #include <tvm/arith/analyzer.h>
+#include <tvm/relay/attrs/transform.h>
 #include <tvm/relay/expr.h>
 #include <tvm/relay/op.h>
 #include <tvm/tir/op.h>
@@ -146,5 +147,19 @@ Array<IndexExpr> RankShape(const Array<IndexExpr>& shape) {
   }
 }
 
+bool ShapeOfRel(const Array<Type>& types, int num_inputs, const Attrs& attrs,
+                const TypeReporter& reporter) {
+  CHECK_EQ(num_inputs, 1);
+  auto tt = types[0].as<TensorTypeNode>();
+  if (tt == nullptr) {
+    return false;
+  }
+  const auto* param = attrs.as<ShapeOfAttrs>();
+  CHECK(param != nullptr);
+  auto rank_shape = RankShape(tt->shape);
+  reporter->Assign(types[1], TensorType(rank_shape, param->dtype));
+  return true;
+}
+
 }  // namespace relay
 }  // namespace tvm

src/relay/op/type_relations.h

@@ -79,6 +79,18 @@ bool IdentityCompRel(const Array<Type>& types, int num_inputs, const Attrs& attr
 
 Array<IndexExpr> RankShape(const Array<IndexExpr>& shape);
 
+/*!
+ * \brief The shape of type relation.
+ *
+ * \param types The input and output types to the relation.
+ * \param num_inputs The number of input arguments.
+ * \param attrs The attributes
+ * \param reporter The reporter.
+ * \return true whether relation has been resolved.
+ */
+bool ShapeOfRel(const Array<Type>& types, int num_inputs, const Attrs& attrs,
+                const TypeReporter& reporter);
+
 }  // namespace relay
 }  // namespace tvm
 

src/relay/op/vm/vm.cc

@@ -0,0 +1,58 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/*!
+ * \file src/relay/op/vm/vm.cc
+ * \brief Dialect operators for Relay VM.
+ */
+
+#include <topi/elemwise.h>
+#include <tvm/relay/expr.h>
+#include <tvm/relay/op.h>
+#include <tvm/relay/op_attr_types.h>
+#include <tvm/runtime/data_type.h>
+
+#include "../../transforms/infer_layout_util.h"
+#include "../op_common.h"
+#include "../type_relations.h"
+
+namespace tvm {
+namespace relay {
+
+RELAY_REGISTER_OP("vm.shape_of")
+    .describe(R"code(Get the shape of an input tensor.
+)code" TVM_ADD_FILELINE)
+    .set_num_inputs(1)
+    .add_argument("tensor", "Tensor", "The input tensor")
+    .add_type_rel("ShapeOf", ShapeOfRel)
+    .set_support_level(10)
+    .set_attr<TOpPattern>("TOpPattern", kOpaque)
+    .set_attr<TOpIsStateful>("TOpIsStateful", false)
+    .set_attr<TNonComputational>("TNonComputational", true)
+    .set_attr<FInferCorrectLayout>("FInferCorrectLayout", ElemwiseArbitraryLayout);
+
+TVM_REGISTER_GLOBAL("relay.op.vm.shape_of").set_body_typed([](Expr expr) {
+  auto attrs = make_object<ShapeOfAttrs>();
+  attrs->dtype = DataType::Int(64);
+  static const Op& op = Op::Get("vm.shape_of");
+  return Call(op, {expr}, Attrs(attrs), {});
+});
+
+}  // namespace relay
+}  // namespace tvm

src/relay/transforms/fold_constant.cc

@@ -81,6 +81,7 @@ class ConstantFolder : public ExprMutator {
       : executor_(executor),
         module_(module),
         shape_of_op_(Op::Get("shape_of")),
+        vm_shape_of_op_(Op::Get("vm.shape_of")),
         invoke_tvm_op_(Op::Get("memory.invoke_tvm_op")),
         shape_func_op_(Op::Get("memory.shape_func")),
         alloc_tensor_op_(Op::Get("memory.alloc_tensor")),
@@ -123,7 +124,7 @@ class ConstantFolder : public ExprMutator {
     // skip stateful ops.
     if (op_stateful.get(GetRef<Op>(op), false)) return res;
     // Try to evaluate shape_of op
-    if (call->op == shape_of_op_) {
+    if (call->op == shape_of_op_ || call->op == vm_shape_of_op_) {
       return EvaluateShapeOf(res, origin_args, call->attrs);
     }
 
@@ -166,6 +167,7 @@ class ConstantFolder : public ExprMutator {
 
   // Cache the following ops for equivalence checking in this pass.
   const Op& shape_of_op_;
+  const Op& vm_shape_of_op_;
   const Op& invoke_tvm_op_;
   const Op& shape_func_op_;
   const Op& alloc_tensor_op_;

src/runtime/vm/executable.cc

@@ -417,6 +417,11 @@ VMInstructionSerializer SerializeInstruction(const Instruction& instr) {
       fields.push_back(instr.pc_offset);
       break;
     }
+    case Opcode::ShapeOf: {
+      // Number of fields = 2
+      fields.assign({instr.shape_of.tensor, instr.dst});
+      break;
+    }
     default:
       LOG(FATAL) << "Invalid opcode" << static_cast<int>(instr.op);
       break;
@@ -683,6 +688,11 @@ Instruction DeserializeInstruction(const VMInstructionSerializer& instr) {
       DCHECK_EQ(instr.fields.size(), 1U);
       return Instruction::Goto(instr.fields[0]);
     }
+    case Opcode::ShapeOf: {
+      // Number of fields = 2
+      DCHECK_EQ(instr.fields.size(), 2U);
+      return Instruction::ShapeOf(instr.fields[0], instr.fields[1]);
+    }
     default:
       LOG(FATAL) << "Invalid opcode" << instr.opcode;
       return Instruction();