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include/tvm/expr.h

@@ -140,7 +140,7 @@ class Integer : public Expr {
    */
   operator int64_t() const {
     CHECK(node_ != nullptr)
-        << " Trying get reference a null Integer";
+        << " Trying to reference a null Integer";
     return (*this)->value;
   }
   /*! \brief type indicate the container type */

include/tvm/relay/feature.h

@@ -0,0 +1,170 @@
+/*
+ * 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 tvm/relay/feature.h
+ * \brief Detect features used in Expr/Module.
+ */
+#ifndef TVM_RELAY_FEATURE_H_
+#define TVM_RELAY_FEATURE_H_
+
+#include <tvm/node/container.h>
+#include <tvm/expr.h>
+#include <bitset>
+
+namespace tvm {
+namespace relay {
+
+/*! \brief Different kinds of relay feature a program might use. */
+enum Feature : int {
+  fVar = 0,
+  fGlobalVar = 1,
+  fConstant = 2,
+  fTuple = 3,
+  fTupleGetItem = 4,
+  fFunction = 5,
+  fOp = 6,
+  fCall = 7,
+  fLet = 8,
+  fIf = 9,
+  fRefCreate = 10,
+  fRefRead = 11,
+  fRefWrite = 12,
+  fConstructor = 13,
+  fMatch = 14,
+  /*! \brief Whether any non-atom fragment of the program is shared, making the program a graph. */
+  fGraph = 15,
+  /*! \brief Whether there is local fixpoint in the program. */
+  fLetRec = 16
+};
+
+constexpr size_t feature_count = 17;
+
+/*!
+ * \brief A finite set of Feature.
+ */
+class FeatureSet {
+ public:
+  FeatureSet(const FeatureSet&) = default;
+  /*! \brief A singleton set containing a single Feature. */
+  explicit FeatureSet(Feature ft) {
+    bs_.set(static_cast<size_t>(ft));
+  }
+  explicit FeatureSet(const tvm::Array<tvm::Integer>& ft) {
+    for (Integer i : ft) {
+      (*this) += Feature(static_cast<int>(i));
+    }
+  }
+  explicit operator Array<Integer>() const {
+    Array<Integer> ret;
+    for (size_t i = 0; i < feature_count; ++i) {
+      if (bs_[i]) {
+        ret.push_back(Integer(i));
+      }
+    }
+    return ret;
+  }
+  /*! \brief A set that contain all the Feature. */
+  static FeatureSet AllFeature() {
+    FeatureSet fs;
+    fs.bs_.flip();
+    return fs;
+  }
+  /*! \brief The empty set. Contain no Feature. */
+  static FeatureSet NoFeature() {
+    FeatureSet fs;
+    return fs;
+  }
+  template<typename T>
+  FeatureSet& operator+=(const T& rhs) {
+    bs_ |= FeatureSet(rhs).bs_;
+    return *this;
+  }
+  /*! \brief Set union. */
+  template<typename T>
+  FeatureSet operator+(const T& rhs) const {
+    FeatureSet fs(*this);
+    fs += rhs;
+    return fs;
+  }
+  template<typename T>
+  FeatureSet& operator-=(const T& rhs) {
+    bs_ &= ~(FeatureSet(rhs)).bs_;
+    return *this;
+  }
+  /*! \brief Set difference. */
+  template<typename T>
+  FeatureSet operator-(const T& rhs) const {
+    FeatureSet fs(*this);
+    fs -= rhs;
+    return fs;
+  }
+  /*!
+   * \brief Is this a subset of rhs?
+   *
+   * \param rhs another FeatureSet.
+   *
+   * \return true only if this is a subset of rhs.
+   */
+  bool is_subset_of(const FeatureSet& rhs) const {
+    return ((*this) - rhs).bs_.none();
+  }
+
+ private:
+  std::bitset<feature_count> bs_;
+  FeatureSet() = default;
+  explicit FeatureSet(const std::bitset<feature_count>& bs) : bs_(bs) { }
+};
+
+class Expr;
+/*!
+ * \brief Calculate the feature of the program.
+ *
+ * \param expr The expression.
+ *
+ * \return The FeatureSet.
+ */
+FeatureSet DetectFeature(const Expr& expr);
+
+struct Module;
+/*!
+ * \brief Calculate the feature of the program.
+ *
+ * \param mod The module.
+ *
+ * \return The FeatureSet.
+ */
+FeatureSet DetectFeature(const Module& mod);
+
+/*!
+ * \brief Calculate the feature of the program.
+ *
+ * \param expr The expression.
+ * \param mod The module.
+ *
+ * \return The FeatureSet.
+ */
+inline FeatureSet DetectFeature(const Expr& expr, const Module& mod) {
+  return DetectFeature(expr) + DetectFeature(mod);
+}
+
+}  // namespace relay
+}  // namespace tvm
+
+#endif  // TVM_RELAY_FEATURE_H_

include/tvm/relay/type.h

@@ -116,10 +116,10 @@ class TensorTypeNode : public BaseTensorTypeNode {
 
 RELAY_DEFINE_NODE_REF(TensorType, TensorTypeNode, Type);
 
-/*! \brief possible kinds of Type */
+/*! \brief Possible kinds of Type. */
 enum Kind : int {
-  /*! \brief template variable in shape expression */
   kType = 0,
+  /*! \brief Template variable in shape expression. */
   kShapeVar = 1,
   kBaseType = 2,
   kShape = 3,

python/tvm/relay/feature.py

@@ -0,0 +1,41 @@
+# 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, unidiomatic-typecheck, invalid-name
+"""The type nodes of the Relay language."""
+from enum import IntEnum
+
+class Feature(IntEnum):
+    """ The features a program might contain. """
+    fVar = 0
+    fGlobalVar = 1
+    fConstant = 2
+    fTuple = 3
+    fTupleGetItem = 4
+    fFunction = 5
+    fOp = 6
+    fCall = 7
+    fLet = 8
+    fIf = 9
+    fRefCreate = 10
+    fRefRead = 11
+    fRefWrite = 12
+    fConstructor = 13
+    fMatch = 14
+    """ Whether any non-atom fragment of the program is shared, making the program a graph. """
+    fGraph = 15
+    """ Whether there is local fixpoint in the program. """
+    fLetRec = 16

python/tvm/relay/ir_pass.py

@@ -25,6 +25,7 @@
 from .expr import Expr
 from .ty import Type
 from .module import Module
+from .feature import Feature
 
 
 def post_order_visit(expr, fvisit):
@@ -604,7 +605,6 @@ def gradient(expr, mod=None, mode='higher_order'):
         raise Exception('unknown mode')
 
 
-
 def get_total_mac_number(expr):
     """
     Count the number of MACs (multiply-accumulate) of a model
@@ -641,6 +641,7 @@ def eliminate_common_subexpr(expr, fskip=None):
     """
     return _ir_pass.eliminate_common_subexpr(expr, fskip)
 
+
 def partial_evaluate(expr, mod=None):
     """
     Evaluate the static fragment of the code.
@@ -660,6 +661,7 @@ def partial_evaluate(expr, mod=None):
     """
     return _ir_pass.partial_evaluate(expr, mod)
 
+
 def unmatched_cases(match, mod=None):
     """
     Finds cases that the match expression does not catch, if any.
@@ -677,3 +679,26 @@ def unmatched_cases(match, mod=None):
       Patterns that the match expression does not catch.
     """
     return _ir_pass.unmatched_cases(match, mod)
+
+
+def detect_feature(a, b=None):
+    """
+    Detect the feature used in a relay program.
+
+    Parameters
+    ----------
+    a : Union[tvm.relay.Expr, tvm.relay.Module]
+      The input expression or module.
+
+    b : Optional[Union[tvm.relay.Expr, tvm.relay.Module]]
+      The input expression or module.
+      The two arguments cannot both be expression or module.
+
+    Returns
+    -------
+    features : Set[Feature]
+      Features used in the program.
+    """
+    if isinstance(a, Module):
+        a, b = b, a
+    return set([Feature(int(x)) for x in _ir_pass.detect_feature(a, b)])

python/tvm/relay/prelude.py

@@ -23,8 +23,8 @@
 from .adt import Constructor, TypeData, Clause, Match
 from .adt import PatternConstructor, PatternVar, PatternWildcard
 from .parser import fromtext
-
 __PRELUDE_PATH__ = os.path.dirname(os.path.realpath(__file__))
+from .module import Module
 
 class Prelude:
     """Contains standard definitions."""
@@ -486,7 +486,9 @@ def load_prelude(self):
             self.compose = self.mod.get_global_var("compose")
 
 
-    def __init__(self, mod):
+    def __init__(self, mod=None):
+        if mod is None:
+            mod = Module()
         self.mod = mod
         self.load_prelude()
         self.define_list_adt()

src/relay/ir/type.cc

@@ -6,9 +6,9 @@
  * 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

src/relay/pass/alter_op_layout.cc

@@ -6,9 +6,9 @@
  * 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
@@ -18,7 +18,7 @@
  */
 
 /*!
- * Copyright (c) 2018 by Contributors
+ * Copyright (c) 2019 by Contributors
  * \file alter_op_layout.cc
  * \brief Alternate the layouts of operators or replace primitive operators with
           other expressions. This pass can be used for computing convolution in