[CODE] Halide attributions (#3824)

include/tvm/dtype.h

@@ -20,6 +20,7 @@
  * \file tvm/dtype.h
  * \brief Data type used in IR.
  */
+// Acknowledgement: DataType structure design originates from Halide.
 #ifndef TVM_DTYPE_H_
 #define TVM_DTYPE_H_
 

include/tvm/expr_operator.h

@@ -24,6 +24,7 @@
  * \note Most of the operator defined here perform simple constant folding
  *   when the type is int32 or int64 for simplifying the index expressions.
  */
+// Acknowledgement: Most operator APIs originate from Halide.
 #ifndef TVM_EXPR_OPERATOR_H_
 #define TVM_EXPR_OPERATOR_H_
 

include/tvm/schedule.h

@@ -21,6 +21,7 @@
  * \file tvm/schedule.h
  * \brief Define a schedule.
  */
+// Acknowledgement: Many schedule primitives originate from Halide and Loopy.
 #ifndef TVM_SCHEDULE_H_
 #define TVM_SCHEDULE_H_
 

src/arithmetic/int_set.h

@@ -32,6 +32,7 @@
 namespace tvm {
 namespace arith {
 
+// Acknowledgement: IntervalSet design originates from Halide.
 /*!
  * \brief Symbolic interval set.
  *