electriclilies commented on a change in pull request #9693:
URL: https://github.com/apache/tvm/pull/9693#discussion_r767017167
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File path: src/printer/text_printer.cc
##########
@@ -36,49 +37,71 @@ static const char* kSemVer = "0.0.5";
Doc TextPrinter::PrintMod(const IRModule& mod) {
Doc doc;
int counter = 0;
+
+ // We'll print in alphabetical order to make a/b diffs easier to work with.
Review comment:
Nice!
##########
File path: src/relay/op/call/call.cc
##########
@@ -63,23 +63,23 @@ bool CallLoweredRel(const Array<Type>& types, int
num_inputs, const Attrs& attrs
const Op& CallLoweredOp() { return Op::Get("call_lowered"); }
-Expr CallLowered(Expr func, Array<Expr> inputs, Attrs attrs, Array<Type>
type_args, Span span) {
- // Right now, call_lowered only supports func being a global var pointing to
the lowered
- // function.
- ICHECK(func.as<GlobalVarNode>())
- << "Function to call should be GlobalVarNode, but got:" << std::endl
- << PrettyPrint(func);
- ICHECK(attrs.as<CallLoweredAttrs>())
- << "Expected attributes to be CallLoweredAttrs, but got " <<
attrs->GetTypeKey();
- return Call(CallLoweredOp(), {std::move(func), Tuple(std::move(inputs))},
std::move(attrs),
- std::move(type_args), std::move(span));
+Call CallLowered(GlobalVar lowered_func, Array<Expr> args, CallLoweredAttrs
call_lowered_attrs,
+ Span span) {
+ auto attrs = make_object<CallLoweredAttrs>(std::move(call_lowered_attrs));
Review comment:
What's the difference between make_object<CallLoweredAttrs> and just
declaring a new CallLoweredAttrs?
##########
File path: src/relay/backend/vm/compiler.cc
##########
@@ -336,10 +337,9 @@ class VMFunctionCompiler :
DeviceAwareExprFunctor<void(const Expr& n)> {
* in emitted code. Note that the host device is always at index 0.
*/
Index GetDeviceIndex(const SEScope& se_scope) {
- VLOG(2) << "getting device index for " << se_scope;
+ ICHECK(!se_scope->IsFullyUnconstrained());
Review comment:
This will be helpful for debugging, thx!
##########
File path: src/relay/op/memory/on_device.cc
##########
@@ -45,53 +43,74 @@ const Op& OnDeviceOp() {
return op;
}
-Expr OnDevice(Expr expr, SEScope se_scope, bool is_fixed) {
- ICHECK(!se_scope->IsFullyUnconstrained());
+Call OnDevice(Expr body, SEScope se_scope, bool constrain_result, bool
constrain_body) {
+ ICHECK((!constrain_result && !constrain_body) ||
!se_scope->IsFullyUnconstrained());
auto attrs = make_object<OnDeviceAttrs>();
- attrs->se_scope = std::move(se_scope);
- attrs->is_fixed = is_fixed;
- Span span = expr->span;
- return Call(OnDeviceOp(), {std::move(expr)}, Attrs(std::move(attrs)),
/*type_args=*/{},
+ attrs->se_scope =
+ (constrain_result || constrain_body) ? std::move(se_scope) :
SEScope::FullyUnconstrained();
+ attrs->constrain_result = constrain_result;
+ attrs->constrain_body = constrain_body;
+ Span span = body->span; // about to be moved
Review comment:
Is there any difference between putting body->span in the constructor
directly and what you've done here (creating a new variable and std::moving it
into the constructor)? (Not asking for a change, just curious)
##########
File path: include/tvm/relay/attrs/on_device.h
##########
@@ -54,44 +54,48 @@ namespace relay {
* multiply(device_copy(add(%x, %y), src_se_scope=GPU, dst_se_scope=CPU), %z)
* \endcode
*
- * The Relay call
- * \code
- * on_device(sub_expr, se_scope=S, is_fixed=True)
- * \endcode
- * is similar to the above, however the annotation itself must appear in an
expression on the
- * same \p SEScope \p S. The compiler will check the \p SEScopes are
consistent, and will not
- * insert any "device_copy" call. This form of annotation shouldn't be
necessary in user programs.
- * However it is needed by the \p PlanDevices pass to fully specify the
results of device planning
- * so that the pass is idempotent.
- *
- * E.g.: The following program is equivalent to the above:
- * \code
- * let %a = on_device(add(%x, %y), se_scope=GPU, is_fixed=True)
- * multiply(device_copy(%a, src_se_scope=GPU, dst_se_scope=CPU), %z)
- * \endcode
- * The "on_device" annotation with \p is_fixed=True indicates unambiguously
that \p %a is stored
- * on the GPU.
+ * The \p constraint_body (default true) and \p constraint_result (default
false) fields can be
+ * used by passes for finer-grained control over how the \p SEScope constraint
should be applied.
*/
struct OnDeviceAttrs : public tvm::AttrsNode<OnDeviceAttrs> {
/*!
- * \brief (Virtual) \p SEScope on which the result of the argument
expression should be stored.
+ * \brief The \p SEScope to constraint to apply to the body, result, or both
body and result
+ * of the "on_device" call.
*/
SEScope se_scope = SEScope::FullyUnconstrained();
+
+ /*!
+ * \brief If fales (the default), the result of the "on_device" call is not
constrained to be
Review comment:
fales => false
##########
File path: src/relay/transforms/device_planner.cc
##########
@@ -844,7 +932,8 @@ class DeviceCapturer : public ExprMutator {
// match.
return VisitExpr(device_copy_props.body);
} else {
- return VisitChild(/*lexical_se_scope=*/dst_se_scope,
+ return VisitChild(/*lexical_se_scope=*/
+ dst_se_scope,
Review comment:
unneeded whitespace change
##########
File path: src/relay/op/memory/on_device.h
##########
@@ -39,14 +39,50 @@ namespace relay {
const Op& OnDeviceOp();
/*!
- * \brief Wraps \p expr in an "on_device" CallNode for \p se_scope and \p
is_fixed.
+ * \brief Wraps \p body in an "on_device" CallNode for \p se_scope.
*
* See \p OnDeviceAttrs for an overview.
*/
-Expr OnDevice(Expr expr, SEScope se_scope, bool is_fixed);
+Call OnDevice(Expr body, SEScope se_scope, bool constrain_result = false,
+ bool constrain_body = true);
+
+/*! \brief Result of \p GetOnDeviceProps. */
+struct OnDeviceProps {
+ Expr body; // = null
+ SEScope se_scope = SEScope::FullyUnconstrained();
+ bool constrain_result = false;
+ bool constrain_body = false;
+
+ OnDeviceProps() = default;
+
+ OnDeviceProps(Expr body, SEScope se_scope, bool constrain_result, bool
constrain_body)
+ : body(std::move(body)),
+ se_scope(std::move(se_scope)),
+ constrain_result(constrain_result),
+ constrain_body(constrain_body) {}
+
+ bool is_fixed() const { return constrain_result && constrain_body; }
+ bool is_normal() const { return !constrain_result && constrain_body; }
+};
+
+/*!
+ * \brief As for OnDevice, but taking all fields other than \p body from \p
props.
+ */
Review comment:
Can you update this comment to something like:
Wrap body with OnDevice, but take all fields other than body from props
(I found "As for OnDevice" confusing)
##########
File path: src/relay/op/memory/on_device.cc
##########
@@ -45,53 +43,74 @@ const Op& OnDeviceOp() {
return op;
}
-Expr OnDevice(Expr expr, SEScope se_scope, bool is_fixed) {
- ICHECK(!se_scope->IsFullyUnconstrained());
+Call OnDevice(Expr body, SEScope se_scope, bool constrain_result, bool
constrain_body) {
+ ICHECK((!constrain_result && !constrain_body) ||
!se_scope->IsFullyUnconstrained());
auto attrs = make_object<OnDeviceAttrs>();
- attrs->se_scope = std::move(se_scope);
- attrs->is_fixed = is_fixed;
- Span span = expr->span;
- return Call(OnDeviceOp(), {std::move(expr)}, Attrs(std::move(attrs)),
/*type_args=*/{},
+ attrs->se_scope =
+ (constrain_result || constrain_body) ? std::move(se_scope) :
SEScope::FullyUnconstrained();
+ attrs->constrain_result = constrain_result;
+ attrs->constrain_body = constrain_body;
+ Span span = body->span; // about to be moved
+ return Call(OnDeviceOp(), {std::move(body)}, Attrs(std::move(attrs)),
/*type_args=*/{},
std::move(span));
}
TVM_REGISTER_GLOBAL("relay.op.annotation._make.OnDevice").set_body_typed(OnDevice);
-Expr MaybeOnDevice(Expr expr, SEScope se_scope, bool is_fixed) {
+Expr MaybeOnDevice(Expr body, SEScope se_scope, bool constrain_result, bool
constrain_body) {
if (se_scope->IsFullyUnconstrained()) {
// Nothing to annotate with.
- return expr;
+ return body;
}
- if (expr->IsInstance<OpNode>() || expr->IsInstance<ConstructorNode>()) {
+ if (body->IsInstance<OpNode>() || body->IsInstance<ConstructorNode>()) {
// These operators are device polymorphic so no annotation is required.
- return expr;
+ return body;
}
- if (expr->IsInstance<GlobalVarNode>() || expr->IsInstance<VarNode>()) {
+ if (body->IsInstance<GlobalVarNode>() || body->IsInstance<VarNode>()) {
// The device can be recovered from the binding site of the global or
local variable.
- return expr;
+ return body;
}
- if (expr->IsInstance<FunctionNode>()) {
+ if (body->IsInstance<FunctionNode>()) {
// If a primitive function then it is device polymorphic. Otherwise the
device is captured
// by the function's "result_se_scope" attribute.
- return expr;
+ return body;
}
- OnDeviceProps props = GetOnDeviceProps(expr);
+ OnDeviceProps props = GetOnDeviceProps(body);
if (props.body.defined()) {
- // Don't nest on_devices.
- // If the inner and outer device types differ then we need to be careful:
- // - If the inner on_device is_fixed then it disagrees with the outer.
- // - If the outer on_device is_fixed then it implies a hidden device_copy
- // Otherwise just use the inner device type and ignore the outer.
- ICHECK(props.se_scope == se_scope || (!is_fixed && !props.is_fixed));
- return OnDevice(props.body, se_scope, is_fixed || props.is_fixed);
+ // The user is asking for
+ // on_device(on_device(body, se_scope=inner), se_scope=outer)
+ // ^ ^ ^
+ // outer middle inner
+ // First recover the implied constraints (if any) for outer and inner, and
check they don't
+ // contradict.
+ const SEScope& inner = props.se_scope;
+ const SEScope& outer = se_scope;
+ bool constrain_outer = constrain_result;
+ bool constrain_inner = props.constrain_body;
+ if (constrain_outer && constrain_inner) {
+ ICHECK(inner == outer)
+ << "Cannot constrain result and body of nested on_device calls to
different SEScopes";
+ }
+ // There are two possible ways the middle sub-expression may be
constrained, check they don't
+ // contradict.
+ bool constrain_middle_via_outer = constrain_body;
+ bool constrain_middle_via_inner = props.constrain_result;
+ if (constrain_middle_via_outer && constrain_middle_via_inner) {
+ ICHECK(inner == outer)
+ << "Cannot constrain intermediate result of nested on_device calls
to different SEScopes";
+ }
+ // We can now ignore the intermediate constraints, if any.
+ return OnDevice(props.body, (constrain_inner || constrain_outer) ? outer :
inner,
Review comment:
If the inner is constrained, we return outer?
##########
File path: src/relay/op/memory/on_device.h
##########
@@ -39,14 +39,50 @@ namespace relay {
const Op& OnDeviceOp();
/*!
- * \brief Wraps \p expr in an "on_device" CallNode for \p se_scope and \p
is_fixed.
+ * \brief Wraps \p body in an "on_device" CallNode for \p se_scope.
*
* See \p OnDeviceAttrs for an overview.
*/
-Expr OnDevice(Expr expr, SEScope se_scope, bool is_fixed);
+Call OnDevice(Expr body, SEScope se_scope, bool constrain_result = false,
+ bool constrain_body = true);
+
+/*! \brief Result of \p GetOnDeviceProps. */
+struct OnDeviceProps {
+ Expr body; // = null
+ SEScope se_scope = SEScope::FullyUnconstrained();
+ bool constrain_result = false;
+ bool constrain_body = false;
+
+ OnDeviceProps() = default;
+
+ OnDeviceProps(Expr body, SEScope se_scope, bool constrain_result, bool
constrain_body)
+ : body(std::move(body)),
+ se_scope(std::move(se_scope)),
+ constrain_result(constrain_result),
+ constrain_body(constrain_body) {}
+
+ bool is_fixed() const { return constrain_result && constrain_body; }
+ bool is_normal() const { return !constrain_result && constrain_body; }
+};
+
+/*!
+ * \brief As for OnDevice, but taking all fields other than \p body from \p
props.
+ */
+inline Call OnDeviceWithProps(Expr body, const OnDeviceProps& props) {
+ return OnDevice(std::move(body), props.se_scope, props.constrain_result,
props.constrain_body);
+}
/*!
- * \brief Wraps \p expr in an "on_device" CallNode for \p se_scope and \p
is_fixed if the
+ * \brief As for OnDevice, but don't constrain the body or result to any
particular virtual device.
Review comment:
again, "As for OnDevice" is a bit confusing
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