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test_alias_analysis.cpp
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test_alias_analysis.cpp
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#include <torch/csrc/autograd/generated/variable_factories.h>
#include <torch/csrc/jit/ir/irparser.h>
#include "test/cpp/jit/test_base.h"
#include "torch/csrc/jit/frontend/ir_emitter.h"
#include "torch/csrc/jit/ir/alias_analysis.h"
#include "torch/csrc/jit/runtime/custom_operator.h"
#include "torch/csrc/utils/memory.h"
namespace torch {
namespace jit {
inline c10::AliasAnalysisKind aliasAnalysisFromSchema() {
return c10::AliasAnalysisKind::FROM_SCHEMA;
}
// Fixture to set up a graph and make assertions clearer
struct TopoMoveTestFixture {
TopoMoveTestFixture() {
createGraph();
aliasDb = torch::make_unique<AliasDb>(graph);
}
// Nodes are named after their output.
// e.g. "a" is an alias for "the node that outputs the value `a`"
void createGraph() {
graph = std::make_shared<Graph>();
createNode("a", {});
createNode("b", {"a"});
createNode("c", {});
createNode("d", {"a", "b"});
createNode("e", {"c", "b"});
createNode("f", {"e"});
createNode("g", {"e"});
createNode("h", {"g"});
createNode("i", {"g"});
createNode("j", {"i"});
createNode("k", {"i"});
createNode("l", {"a"});
createNode("m", {}, {"l"}); // block depends on l
createNode("n", {"m"});
createNode("o", {"n"});
createNode("p", {});
createNode("q", {});
createNode("r", {"q"});
createNode("s", {"q"});
graph->lint();
}
void createNode(
const std::string& name,
const std::vector<std::string>& inputNames,
const std::vector<std::string>& blockInputNames = {}) {
std::vector<Value*> inputs;
for (const auto& name_ : inputNames) {
inputs.push_back(nodes.at(name_)->output());
}
auto node = graph->appendNode(graph->create(prim::AutogradZero, inputs));
node->output()->setDebugName(name);
nodes[name] = node;
if (blockInputNames.size() != 0) {
node->addBlock();
std::vector<Value*> blockDeps;
for (const auto& name_ : blockInputNames) {
blockDeps.push_back(nodes.at(name_)->output());
}
auto block = node->blocks().at(0);
block->appendNode(graph->create(prim::AutogradZero, blockDeps));
}
}
bool moveBeforeTopologicallyValid(
const std::string& toInsert,
const std::string& insertPoint) {
std::function<bool(Node*, Node*)> func =
[this](Node* toInsert, Node* insertPoint) {
return aliasDb->moveBeforeTopologicallyValid(toInsert, insertPoint);
};
return moveWithChecks(toInsert, insertPoint, func);
}
bool moveAfterTopologicallyValid(
const std::string& toInsert,
const std::string& insertPoint) {
std::function<bool(Node*, Node*)> func =
[this](Node* toInsert, Node* insertPoint) {
return aliasDb->moveAfterTopologicallyValid(toInsert, insertPoint);
};
return moveWithChecks(toInsert, insertPoint, func);
}
bool moveWithChecks(
const std::string& toInsert,
const std::string& insertPoint,
std::function<bool(Node*, Node*)> func) {
auto n = nodes.at(toInsert);
auto insert = nodes.at(insertPoint);
bool isAfter = n->isAfter(insert);
std::vector<Node*> originalOrdering;
Node* original = isAfter ? n->next() : n->prev();
auto curNode = original;
while (curNode != n->owningBlock()->return_node()) {
originalOrdering.push_back(curNode);
if (isAfter) {
curNode = curNode->next();
} else {
curNode = curNode->prev();
}
}
const auto couldMove = func(n, insert);
// Check the graph is okay
graph->lint();
// If this is the picture of nodes
// <some nodes> ... toInsert ... <some more nodes> ... insertPoint
// ^----------^ check that these nodes haven't moved
curNode = original;
size_t idx = 0;
while (curNode != n->owningBlock()->return_node()) {
AT_ASSERT(originalOrdering[idx] == curNode);
if (isAfter) {
curNode = curNode->next();
} else {
curNode = curNode->prev();
}
idx++;
}
return couldMove;
}
void checkPostCondition(
const std::string& toInsert,
const std::string& insertPoint,
bool after) {
if (after) {
AT_ASSERT(nodes.at(toInsert)->prev() == nodes.at(insertPoint));
} else {
AT_ASSERT(nodes.at(toInsert)->next() == nodes.at(insertPoint));
}
}
std::shared_ptr<Graph> graph;
std::unique_ptr<AliasDb> aliasDb;
std::unordered_map<std::string, Node*> nodes;
};
void testTopologicalMove() {
{
// Check that we are removing `this`'s deps properly when we need to split
// `this` and deps (see code for what the hell that means)
TopoMoveTestFixture fixture;
AT_ASSERT(fixture.moveBeforeTopologicallyValid("q", "s"));
fixture.checkPostCondition("q", "s", false);
}
// Move after
{
// Simple move backward
TopoMoveTestFixture fixture;
AT_ASSERT(fixture.moveAfterTopologicallyValid("c", "a"));
fixture.checkPostCondition("c", "a", true);
}
{
// simple invalid move backward
TopoMoveTestFixture fixture;
AT_ASSERT(!fixture.moveAfterTopologicallyValid("d", "a"));
}
{
// doesn't actually move anything
TopoMoveTestFixture fixture;
AT_ASSERT(fixture.moveAfterTopologicallyValid("f", "e"));
fixture.checkPostCondition("f", "e", true);
}
{
// move backward with multiple dependencies
TopoMoveTestFixture fixture;
AT_ASSERT(fixture.moveAfterTopologicallyValid("e", "c"));
fixture.checkPostCondition("e", "c", true);
}
{
// Move backward with non-zero working set
TopoMoveTestFixture fixture;
AT_ASSERT(fixture.moveAfterTopologicallyValid("k", "f"));
fixture.checkPostCondition("k", "f", true);
}
{
// Simple move forward
TopoMoveTestFixture fixture;
AT_ASSERT(fixture.moveAfterTopologicallyValid("c", "d"));
fixture.checkPostCondition("c", "d", true);
}
{
// Move forward with non-zero working set
TopoMoveTestFixture fixture;
AT_ASSERT(fixture.moveAfterTopologicallyValid("f", "l"));
fixture.checkPostCondition("f", "l", true);
}
// Move before
{
// Simple move forward
TopoMoveTestFixture fixture;
AT_ASSERT(fixture.moveBeforeTopologicallyValid("b", "d"));
fixture.checkPostCondition("b", "d", false);
}
{
// Simple move backward
TopoMoveTestFixture fixture;
AT_ASSERT(fixture.moveBeforeTopologicallyValid("c", "a"));
fixture.checkPostCondition("c", "a", false);
}
{
// doesn't actually move anything
TopoMoveTestFixture fixture;
AT_ASSERT(fixture.moveBeforeTopologicallyValid("a", "b"));
fixture.checkPostCondition("a", "b", false);
}
{
// move forward with deps
TopoMoveTestFixture fixture;
AT_ASSERT(fixture.moveBeforeTopologicallyValid("f", "m"));
fixture.checkPostCondition("f", "m", false);
}
{
// move backward with deps
TopoMoveTestFixture fixture;
AT_ASSERT(fixture.moveBeforeTopologicallyValid("l", "f"));
fixture.checkPostCondition("l", "f", false);
}
// check that dependencies in blocks are recognized
{
TopoMoveTestFixture fixture;
AT_ASSERT(!fixture.moveAfterTopologicallyValid("l", "m"));
AT_ASSERT(!fixture.moveBeforeTopologicallyValid("m", "l"));
AT_ASSERT(!fixture.moveAfterTopologicallyValid("n", "l"));
AT_ASSERT(!fixture.moveBeforeTopologicallyValid("l", "n"));
}
// Test that moveAfter(n) and moveBefore(n->next()) are not necessarily
// equivalent. Here, the dependency ordering is n -> o -> p. So we can't
// move `n` after `o`, but we can move `n` before `p` (which pushes `o` after
// `p`)
{
TopoMoveTestFixture fixture;
AT_ASSERT(!fixture.moveAfterTopologicallyValid("n", "o"));
AT_ASSERT(fixture.moveBeforeTopologicallyValid("o", "p"));
fixture.checkPostCondition("o", "p", false);
}
}
namespace {
Node* insertIf(
Graph& g,
Value* condValue,
std::function<std::vector<Value*>()> trueInst,
std::function<std::vector<Value*>()> falseInst) {
auto if_ = g.insertNode(g.create(prim::If, 0));
if_->addInput(condValue); // condition value
auto trueBlock = if_->addBlock();
auto falseBlock = if_->addBlock();
{
// Mutate in true block
WithInsertPoint g(trueBlock);
auto outputs = trueInst();
for (auto output : outputs) {
trueBlock->registerOutput(output);
}
}
{
WithInsertPoint g(falseBlock);
auto outputs = falseInst();
for (auto output : outputs) {
falseBlock->registerOutput(output);
}
}
AT_ASSERT(trueBlock->outputs().size() == falseBlock->outputs().size());
for (auto output : trueBlock->outputs()) {
if_->addOutput()->setType(output->type());
}
return if_;
}
template <class Exception, class Functor>
inline void expectThrows(Functor&& functor, const char* expectMessageContains) {
try {
std::forward<Functor>(functor)();
} catch (const Exception& e) {
if (std::string(e.what()).find(expectMessageContains) ==
std::string::npos) {
AT_ERROR(
"Expected error message to contain \"",
expectMessageContains,
"\" but error message was: ",
e.what());
}
return;
}
AT_ERROR(
"Expected to throw exception containing \"",
expectMessageContains,
"\" but didn't throw");
}
} // namespace
void testAliasAnalysis() {
{
auto graph = std::make_shared<Graph>();
auto a = graph->addInput();
auto b = graph->addInput();
// addsB = b + b
// c = a + b
// a += b
// d = c + c
auto addsB = graph->insert(aten::add, {b, b});
auto c = graph->insert(aten::add, {a, b});
auto aMut = graph->insert(aten::add_, {a, b});
auto d = graph->insert(aten::add, {c, c});
graph->lint();
AliasDb aliasDb(graph);
// Can't move past a mutation of a used value
AT_ASSERT(!aliasDb.moveAfterTopologicallyValid(c->node(), aMut->node()));
AT_ASSERT(aliasDb.moveAfterTopologicallyValid(d->node(), c->node()));
// b should alias to a (since they are both inputs)
AT_ASSERT(
!aliasDb.moveAfterTopologicallyValid(addsB->node(), aMut->node()));
AT_ASSERT(aliasDb.moveAfterTopologicallyValid(addsB->node(), c->node()));
graph->lint();
}
{
auto graph = std::make_shared<Graph>();
auto a = graph->addInput();
auto b = graph->addInput();
auto constant = graph->insertConstant(1);
auto fresh = graph->insert(aten::rand, {constant});
auto usesB = graph->insert(aten::add, {b, fresh});
auto aliasesB = graph->insert(aten::select, {a, constant, constant});
auto mutatesAliasOfB = graph->insert(aten::add_, {aliasesB, fresh});
graph->insert(aten::add, {fresh, aliasesB});
graph->lint();
AliasDb aliasDb(graph);
AT_ASSERT(!aliasDb.moveAfterTopologicallyValid(
aliasesB->node(), mutatesAliasOfB->node()));
AT_ASSERT(!aliasDb.moveAfterTopologicallyValid(
usesB->node(), mutatesAliasOfB->node()));
}
{
// Test moves across inner blocks
// a = rand(1)
// b = rand(1)
// if True:
// a.add_(b)
// c = a + b
auto graph = std::make_shared<Graph>();
auto constant = graph->insertConstant(1);
auto a = graph->insert(aten::rand, {constant});
auto b = graph->insert(aten::rand, {constant});
auto if_ = insertIf(
*graph,
constant,
[&]() -> std::vector<Value*> {
auto aMut = graph->insert(aten::add_, {a, b});
return {aMut};
},
[&]() -> std::vector<Value*> { return {a}; });
auto c = graph->insert(aten::add, {a, b});
graph->lint();
// we should not be able to move `c` before the if statement, since it
// may write to `a`.
AliasDb aliasDb(graph);
ASSERT_FALSE(aliasDb.moveBeforeTopologicallyValid(c->node(), if_));
}
// test none value does not have writers
{{auto graph = std::make_shared<Graph>();
std::unordered_map<std::string, Value*> vmap;
parseIR(
R"IR(
graph():
%opt : Tensor? = prim::Constant()
%out : Tensor = prim::unchecked_unwrap_optional(%opt)
%ret.2 : Tensor = aten::div(%out, %out, %out)
return (%opt, %out, %ret.2)
)IR",
&*graph,
vmap);
AliasDb aliasDb(graph);
AT_ASSERT(!aliasDb.hasWriters(vmap["opt"]->node()));
}
} // namespace jit
// test safeToIntroduceAliasingRelationship
{
auto graph = std::make_shared<Graph>();
std::unordered_map<std::string, Value*> vmap;
parseIR(
R"IR(
graph(%x : Tensor):
%3 : int = prim::Constant[value=1]()
%2 : int = prim::Constant[value=0]()
%b : Tensor = aten::add(%x, %2, %3)
%c : Tensor = aten::add(%x, %2, %3)
%d : Tensor = aten::add(%x, %2, %3)
%e : Tensor = aten::add(%x, %2, %3)
%f : Tensor[] = prim::ListConstruct(%e)
%14 : (Tensor, Tensor) = prim::TupleConstruct(%b, %c)
return (%14)
)IR",
&*graph,
vmap);
AliasDb aliasDb(graph);
// x, b, c escape scope, so we can't introduce an aliasing relationship
TORCH_INTERNAL_ASSERT(
!aliasDb.safeToChangeAliasingRelationship(vmap["x"], vmap["b"]));
TORCH_INTERNAL_ASSERT(
!aliasDb.safeToChangeAliasingRelationship(vmap["b"], vmap["x"]));
TORCH_INTERNAL_ASSERT(
!aliasDb.safeToChangeAliasingRelationship(vmap["b"], vmap["c"]));
TORCH_INTERNAL_ASSERT(
!aliasDb.safeToChangeAliasingRelationship(vmap["c"], vmap["b"]));
// e aliases the wildcard set because it's contained in a list
TORCH_INTERNAL_ASSERT(
!aliasDb.safeToChangeAliasingRelationship(vmap["e"], vmap["x"]));
TORCH_INTERNAL_ASSERT(
!aliasDb.safeToChangeAliasingRelationship(vmap["x"], vmap["e"]));
// d is a temporary with no writers, safe to change aliasing relationship here
TORCH_INTERNAL_ASSERT(
aliasDb.safeToChangeAliasingRelationship(vmap["c"], vmap["d"]));
TORCH_INTERNAL_ASSERT(
aliasDb.safeToChangeAliasingRelationship(vmap["d"], vmap["c"]));
}
} // namespace torch
void testWriteTracking() {
RegisterOperators reg({Operator(
"prim::creates_alias(Tensor(a) x) -> Tensor(a)",
[](Stack& s) { return 0; },
aliasAnalysisFromSchema())});
const auto creates_alias = Symbol::fromQualString("prim::creates_alias");
{
auto graph = std::make_shared<Graph>();
auto a = graph->addInput();
auto b = graph->addInput();
// aten::add(%b, %b)
// aten::add_(%a, %b)
// foo::creates_alias(%a)
auto pureNode = graph->insert(aten::add, {b, b})->node();
auto writingNode = graph->insert(aten::add_, {a, b})->node();
auto node3 = graph->insert(creates_alias, {a})->node();
auto aAlias = node3->output();
graph->lint();
AliasDb aliasDb(graph);
ASSERT_TRUE(aliasDb.mayAlias(aAlias, a));
ASSERT_TRUE(aliasDb.mayAlias(a, b));
ASSERT_FALSE(
aliasDb.writesToAlias(pureNode, std::unordered_set<const Value*>{a}));
ASSERT_FALSE(
aliasDb.writesToAlias(pureNode, std::unordered_set<const Value*>{b}));
ASSERT_TRUE(aliasDb.writesToAlias(
writingNode, std::unordered_set<const Value*>{a}));
ASSERT_TRUE(aliasDb.writesToAlias(
writingNode, std::unordered_set<const Value*>{a, b}));
ASSERT_TRUE(aliasDb.writesToAlias(
writingNode, std::unordered_set<const Value*>{aAlias}));
}
{
auto graph = std::make_shared<Graph>();
parseIR(
R"IR(
graph(%x: Tensor):
%b : Tensor = aten::relu_(%x)
return (%b)
)IR",
&*graph);
auto node_iter = graph->block()->nodes().begin();
auto relu = *node_iter;
AliasDb aliasDb(graph);
AT_ASSERT(aliasDb.isMutable(relu));
}
{
auto graph = std::make_shared<Graph>();
parseIR(
R"IR(
graph(%x: Tensor, %y : Tensor):
%b : Tensor = aten::mul(%x, %y)
return (%b)
)IR",
&*graph);
auto node_iter = graph->block()->nodes().begin();
auto mul = *node_iter;
AliasDb aliasDb(graph);
AT_ASSERT(!aliasDb.isMutable(mul));
}
{
auto graph = std::make_shared<Graph>();
std::unordered_map<std::string, Value*> vmap;
parseIR(
R"IR(
graph(%x: Tensor, %y : Tensor):
%c1 : int = prim::Constant[value=1]()
%b : Tensor = aten::add_(%x, %y, %c1)
return (%b)
)IR",
&*graph,
vmap);
auto add = vmap["b"]->node();
AliasDb aliasDb(graph);
AT_ASSERT(aliasDb.hasWriters(add));
AT_ASSERT(aliasDb.isMutable(add));
}
}
void testContainerAliasing() {
{
auto graph = std::make_shared<Graph>();
std::unordered_map<std::string, Value*> vmap;
parseIR(
R"IR(
graph(%inp: Tensor[]):
%x : str = prim::Constant[value="a"]()
%y : Tensor = prim::Constant()
%z : Tensor = prim::Constant()
%a : (Tensor) = prim::TupleConstruct(%y)
%b : Dict(str, Tensor) = prim::DictConstruct(%x, %y)
%c : Tensor[] = prim::ListConstruct(%y)
return (%a, %b, %c)
)IR",
&*graph,
vmap);
auto str_output = vmap["x"];
auto ten_output = vmap["y"];
auto local_var = vmap["z"];
AliasDb aliasDb(graph);
AT_ASSERT(graph->outputs().size() == 3);
for (auto out : graph->outputs()) {
AT_ASSERT(aliasDb.mayContainAlias(ten_output, out));
AT_ASSERT(!aliasDb.mayContainAlias(local_var, out));
}
AT_ASSERT(aliasDb.mayContainAlias(ten_output, graph->inputs()));
AT_ASSERT(!aliasDb.mayContainAlias(local_var, graph->inputs()));
AT_ASSERT(aliasDb.mayContainAlias({ten_output}, graph->outputs()));
AT_ASSERT(!aliasDb.mayContainAlias(str_output, graph->outputs()));
}
{
auto graph = std::make_shared<Graph>();
parseIR(
R"IR(
graph():
%x : str = prim::Constant[value="a"]()
%y : int = prim::Constant[value=1]()
%a : (int) = prim::TupleConstruct(%y)
%b : Dict(str, int) = prim::DictConstruct(%x, %y)
%c : int[] = prim::ListConstruct(%y)
return (%a, %b, %c)
)IR",
&*graph);
auto node_iter = graph->block()->nodes().begin();
node_iter++; // string
Node* int_node = *node_iter++;
AliasDb aliasDb(graph);
AT_ASSERT(graph->outputs().size() == 3);
// primitive values don't need to alias container
for (auto out : graph->outputs()) {
AT_ASSERT(!aliasDb.mayContainAlias(int_node->output(), out));
}
}
// Test input aliasing
{
auto graph = std::make_shared<Graph>();
parseIR(
R"IR(
graph(%x: Tensor, %y: Tensor):
%a : (Tensor) = prim::TupleConstruct(%x)
return (%a)
)IR",
&*graph);
auto node_iter = graph->block()->nodes().begin();
auto tuple_node = *node_iter;
AliasDb aliasDb(graph);
for (auto input : graph->inputs()) {
AT_ASSERT(aliasDb.mayContainAlias(input, tuple_node->output()));
}
AT_ASSERT(aliasDb.mayContainAlias(graph->inputs(), graph->outputs()));
}
// Test tuple that doesn't come from construct
{
auto graph = std::make_shared<Graph>();
parseIR(
R"IR(
graph(%x : int,
%y : Tensor,
%z : Tensor):
%3 : int = prim::Constant[value=1]()
%4 : bool = aten::eq(%x, %3)
%a : (Tensor) = prim::If(%4)
block0():
%a.1 : (Tensor) = prim::TupleConstruct(%y)
-> (%a.1)
block1():
%a.2 : (Tensor) = prim::TupleConstruct(%z)
-> (%a.2)
return (%a)
)IR",
&*graph);
AliasDb aliasDb(graph);
for (auto input : graph->inputs()) {
if (input->type() == IntType::get()) {
continue;
}
AT_ASSERT(aliasDb.mayContainAlias(input, graph->outputs().at(0)));
}
}
// test nested types
{
auto graph = std::make_shared<Graph>();
parseIR(
R"IR(
graph():
%a : Tensor = prim::MakeTestTensor()
%a_list : Tensor[] = prim::ListConstruct(%a)
%b : Tensor = prim::MakeTestTensor()
%b_list : Tensor[] = prim::ListConstruct(%b)
%13 : (Tensor[], Tensor[]) = prim::TupleConstruct(%a_list, %b_list)
return (%13)
)IR",
&*graph);
AliasDb aliasDb(graph);
auto g_output = graph->outputs().at(0);
auto list_2 = g_output->node()->inputs().at(0);
auto list_1 = g_output->node()->inputs().at(1);
// TODO FIX assume conservatively for now
AT_ASSERT(aliasDb.mayContainAlias(list_1, list_2));
AT_ASSERT(aliasDb.mayContainAlias(list_2, list_1));
AT_ASSERT(aliasDb.mayContainAlias(list_1, g_output));
AT_ASSERT(aliasDb.mayContainAlias(list_2, g_output));
}
// simple example
{
auto graph = std::make_shared<Graph>();
parseIR(
R"IR(
graph():
%0 : Tensor = prim::Constant()
%1 : Tensor = prim::Constant()
%13 : (Tensor) = prim::TupleConstruct(%0)
return (%13)
)IR",
&*graph);
AliasDb aliasDb(graph);
auto node_iter = graph->block()->nodes().begin();
auto first_ten = *node_iter++;
auto second_ten = *node_iter++;
auto tup_node = *node_iter;
AT_ASSERT(aliasDb.mayContainAlias(first_ten->output(), tup_node->output()));
AT_ASSERT(
!aliasDb.mayContainAlias(second_ten->output(), tup_node->output()));
std::vector<Value*> first_st = {first_ten->output()};
std::vector<Value*> second_st = {second_ten->output()};
std::vector<Value*> tup_st = {tup_node->output()};
AT_ASSERT(aliasDb.mayContainAlias(first_st, tup_st));
AT_ASSERT(!aliasDb.mayContainAlias(first_st, second_st));
AT_ASSERT(!aliasDb.mayContainAlias(second_st, tup_st));
}
{
auto graph = std::make_shared<Graph>();
std::unordered_map<std::string, Value*> vmap;
parseIR(
R"IR(
graph():
%x : str = prim::Constant[value="a"]()
%y : Tensor = prim::Constant()
%c : Tensor[] = prim::ListConstruct(%y)
%d : Tensor[] = prim::ListConstruct(%y)
return (%c, %d)
)IR",
&*graph,
vmap);
AliasDb aliasDb(graph);
auto x = vmap["x"];
auto c = vmap["c"];
AT_ASSERT(!aliasDb.mayContainAlias(x, c));
AT_ASSERT(!aliasDb.mayContainAlias(c, x));
auto d = vmap["d"];
AT_ASSERT(aliasDb.mayContainAlias(d, c));
AT_ASSERT(aliasDb.mayContainAlias(c, d));
}
{
// Test list container aliasing
auto graph = std::make_shared<Graph>();
std::unordered_map<std::string, Value*> vmap;
parseIR(
R"IR(
graph():
%0 : int = prim::Constant[value=2]()
%1 : int = prim::Constant[value=3]()
%2 : int[] = prim::ListConstruct(%0, %1)
%x : Tensor = prim::MakeTestTensor()
%12 : int[] = prim::ListConstruct(%0, %1)
%y : Tensor = prim::MakeTestTensor()
%22 : int[] = prim::ListConstruct(%0, %1)
%z : Tensor = prim::MakeTestTensor()
%32 : int[] = prim::ListConstruct(%0, %1)
%fresh : Tensor = prim::MakeTestTensor()
%foo : Tensor[] = prim::ListConstruct(%x, %y)
%43 : Tensor[] = aten::append(%foo, %z)
return ()
)IR",
graph.get(),
vmap);
AliasDb aliasDb(graph);
auto x = vmap["x"];
auto y = vmap["y"];
auto z = vmap["z"];
// Tensors x, y, and z went into a list, so they all may alias each other.
ASSERT_TRUE(aliasDb.mayAlias(x, y));
ASSERT_TRUE(aliasDb.mayAlias(y, z));
ASSERT_TRUE(aliasDb.mayAlias(x, z));
// But we know `fresh` didn't go into a list, so x, y, and z should not
// alias it.
auto fresh = vmap["fresh"];
ASSERT_FALSE(aliasDb.mayAlias(x, fresh));
ASSERT_FALSE(aliasDb.mayAlias(y, fresh));
ASSERT_FALSE(aliasDb.mayAlias(z, fresh));
}
{
// test "conservative" analysis writes to the inside of a container.
auto ops = torch::RegisterOperators(
"custom::conservative", [](torch::List<at::Tensor> in) { return in; });
auto graph = std::make_shared<Graph>();
std::unordered_map<std::string, Value*> vmap;
parseIR(
R"IR(
graph():
%0 : int = prim::Constant[value=2]()
%1 : int = prim::Constant[value=3]()
%2 : int[] = prim::ListConstruct(%0, %1)
%11 : Tensor = prim::MakeTestTensor()
%12 : Tensor[] = prim::ListConstruct(%11)
%out : Tensor[] = custom::conservative(%12)
%ret.2 : Tensor = aten::div(%11, %11)
return ()
)IR",
graph.get(),
vmap);
AliasDb aliasDb(graph);
auto conservativeOp = vmap["out"]->node();
auto tensor = vmap["11"];
ASSERT_TRUE(aliasDb.writesToAlias(conservativeOp, ValueSet{tensor}));
}
{
auto ops = torch::RegisterOperators().op(
"uses::list",
torch::RegisterOperators::options()
.catchAllKernel([](torch::List<at::Tensor> in) {
return torch::rand({2, 3});
})
.aliasAnalysis(AliasAnalysisKind::PURE_FUNCTION));
// Write to the inside of a list. Check that we can't reorder a
// print across it.
auto graph = std::make_shared<Graph>();
std::unordered_map<std::string, Value*> vmap;
parseIR(
R"IR(
graph():
%35 : int = prim::Constant[value=1]()
%0 : int = prim::Constant[value=2]()
%1 : int = prim::Constant[value=3]()
%23 : int = prim::Constant[value=0]()
%2 : int[] = prim::ListConstruct(%0, %1)
%11 : Tensor = prim::MakeTestTensor()
%12 : int[] = prim::ListConstruct(%0, %1)
%21 : Tensor = prim::MakeTestTensor()
%l : Tensor[] = prim::ListConstruct(%11, %21)
%24 : Tensor = aten::select(%l, %23)
%25 : int[] = prim::ListConstruct(%0, %1)
%34 : Tensor = prim::MakeTestTensor()
%36 : Tensor = aten::add_(%24, %34, %35)
%37 : Tensor = uses::list(%l)
return (%37)
)IR",
graph.get(),
vmap);
AliasDb aliasDb(graph);
auto listUse = vmap["37"]->node();
auto internalWrite = vmap["36"]->node();
ASSERT_FALSE(aliasDb.moveBeforeTopologicallyValid(listUse, internalWrite));
}
{
// The same as above, but with a nested list
auto ops = torch::RegisterOperators().op(
"uses::list",
torch::RegisterOperators::options()
.catchAllKernel([](torch::List<at::Tensor> in) {
return torch::rand({2, 3});
})
.aliasAnalysis(AliasAnalysisKind::PURE_FUNCTION));
// Write to the inside of a list. Check that we can't reorder a
// print across it.
auto graph = std::make_shared<Graph>();
std::unordered_map<std::string, Value*> vmap;
parseIR(
R"IR(
graph():
%38 : int = prim::Constant[value=1]()
%0 : int = prim::Constant[value=2]()
%1 : int = prim::Constant[value=3]()
%24 : int = prim::Constant[value=0]()
%2 : int[] = prim::ListConstruct(%0, %1)
%11 : Tensor = prim::MakeTestTensor()
%12 : int[] = prim::ListConstruct(%0, %1)
%21 : Tensor = prim::MakeTestTensor()
%l : Tensor[] = prim::ListConstruct(%11, %21)
%25 : Tensor = aten::select(%l, %24)
%27 : Tensor = aten::select(%25, %24, %24)
%28 : int[] = prim::ListConstruct(%0, %1)
%37 : Tensor = prim::MakeTestTensor()
%39 : Tensor = aten::add_(%27, %37, %38)
%40 : Tensor = uses::list(%l)
return (%40)
)IR",
graph.get(),
vmap);
AliasDb aliasDb(graph);
auto listUse = vmap["40"]->node();
auto internalWrite = vmap["39"]->node();
ASSERT_FALSE(aliasDb.moveBeforeTopologicallyValid(listUse, internalWrite));
}
}
void testWildcards() {
RegisterOperators reg({Operator(
"prim::returns_wildcard(Tensor a) -> Tensor(*)",
[](Stack& stack) { return 0; },
aliasAnalysisFromSchema()),
Operator(
"prim::writes(Tensor(z!) a) -> Tensor(a)",
[](Stack& stack) { return 0; },
aliasAnalysisFromSchema())});
const auto returns_wildcard =
Symbol::fromQualString("prim::returns_wildcard");
const auto writes = Symbol::fromQualString("prim::writes");
auto graph = std::make_shared<Graph>();
const auto a = graph->addInput();
const auto constant = graph->insertConstant(1);
const auto fresh = graph->insert(aten::rand, {constant});
const auto fresh2 = graph->insert(aten::rand, {constant});
const auto wildcard = graph->insert(returns_wildcard, {fresh});
{
graph->lint();
AliasDb aliasDb(graph);
ASSERT_FALSE(aliasDb.mayAlias(a, fresh));
ASSERT_FALSE(aliasDb.mayAlias(wildcard, fresh));
ASSERT_TRUE(aliasDb.mayAlias(wildcard, a));
ASSERT_FALSE(aliasDb.mayAlias(ValueSet{wildcard}, ValueSet{}));
ASSERT_FALSE(aliasDb.hasWriters(wildcard->node()));
}
graph->insert(writes, {fresh2})->node();
{
graph->lint();
AliasDb aliasDb(graph);
ASSERT_FALSE(aliasDb.hasWriters(wildcard->node()));
}
const auto wildcardWrite = graph->insert(writes, {wildcard})->node();
{
graph->lint();
AliasDb aliasDb(graph);
// Test writes to wildcards
ASSERT_FALSE(aliasDb.writesToAlias(
wildcardWrite, std::unordered_set<const Value*>{fresh}));
ASSERT_FALSE(aliasDb.writesToAlias(
wildcardWrite, std::unordered_set<const Value*>{fresh2}));
ASSERT_TRUE(aliasDb.writesToAlias(
wildcardWrite, std::unordered_set<const Value*>{a}));
ASSERT_TRUE(aliasDb.hasWriters(wildcard->node()));
}
// test that wildcards are correctly divided by type
{
auto graph = std::make_shared<Graph>();
std::unordered_map<std::string, Value*> vmap;
parseIR(
R"IR(
graph(%ten_list : Tensor[], %int_list : int[], %opt_ten_list : Tensor[]?):
%ten : Tensor = prim::Constant()
%4 : Tensor[] = aten::append(%ten_list, %ten)
%ten_ten_list : Tensor[][] = prim::Constant()
%int_int_list : int[][] = prim::Constant()
return ()
)IR",
&*graph,
vmap);
AliasDb aliasDb(graph);
auto opt_ten_list = vmap["opt_ten_list"];
auto ten_list = vmap["ten_list"];
auto int_list = vmap["int_list"];
AT_ASSERT(!aliasDb.hasWriters(int_list));
AT_ASSERT(aliasDb.hasWriters(opt_ten_list));
AT_ASSERT(aliasDb.hasWriters(ten_list));
AT_ASSERT(!aliasDb.mayContainAlias(int_list, opt_ten_list));
AT_ASSERT(aliasDb.mayContainAlias(ten_list, opt_ten_list));
AT_ASSERT(aliasDb.mayAlias(ten_list, opt_ten_list));
auto list_of_tensor_lists = vmap["ten_ten_list"];
AT_ASSERT(aliasDb.mayContainAlias(ten_list, list_of_tensor_lists));
AT_ASSERT(aliasDb.mayContainAlias(ten_list, vmap["ten"]));
AT_ASSERT(
!aliasDb.mayContainAlias(vmap["int_int_list"], list_of_tensor_lists));
}
// test invariant container aliasing
// the containers of different type cannot alias each other,
// however they may contain elements which alias each other
{
auto graph = std::make_shared<Graph>();
std::unordered_map<std::string, Value*> vmap;
parseIR(
R"IR(
graph(%ten_list : Tensor[], %ten_opt_list : Tensor?[]):
%ten : Tensor = prim::Constant()
%4 : Tensor[] = aten::append(%ten_list, %ten)
return ()
)IR",
&*graph,
vmap);
AliasDb aliasDb(graph);
auto ten_opt_list = vmap["ten_opt_list"];
auto ten_list = vmap["ten_list"];
AT_ASSERT(!aliasDb.hasWriters(ten_opt_list));
AT_ASSERT(aliasDb.hasWriters(ten_list));
AT_ASSERT(aliasDb.mayContainAlias(ten_list, ten_opt_list));
AT_ASSERT(!aliasDb.mayAlias(ten_list, ten_opt_list));
}
{
auto graph = std::make_shared<Graph>();
std::unordered_map<std::string, Value*> vmap;
parseIR(
R"IR(
graph(%float_3D : Float(*, *, *), %float_2D : Float(*, *)):
return ()
)IR",