未验证 提交 857a8997 编写于 作者: T Tao Luo 提交者: GitHub

Merge pull request #9384 from luotao1/removeVar

remove vars when remove ops
......@@ -147,15 +147,52 @@ void BlockDesc::RemoveOp(size_t s, size_t e) {
if (ops_.begin() + s == ops_.end() || ops_.begin() + e == ops_.end()) {
return;
}
auto get_vars = [](std::deque<std::unique_ptr<OpDesc>>::iterator &op,
std::vector<std::string> &v) {
auto in_names = (*op)->InputArgumentNames();
v.insert(v.end(), in_names.begin(), in_names.end());
auto out_names = (*op)->OutputArgumentNames();
v.insert(v.end(), out_names.begin(), out_names.end());
std::sort(v.begin(), v.end());
auto last = std::unique(v.begin(), v.end());
v.erase(last, v.end());
};
need_update_ = true;
for (auto it = ops_.begin() + s; it != ops_.begin() + e; it++) {
auto names = (*it)->InputArgumentNames();
for (auto n : names) {
// TODO(typhoonzero): delete vars if no other op use it.
VLOG(3) << "deleting var " << n;
for (size_t i = s; i < e; i++) {
// since remove op one by one, every time remove the first op.
auto op = ops_.begin() + s;
// collect input and output variables from current delete op
std::vector<std::string> cur_vars;
get_vars(op, cur_vars);
// remove current op
ops_.erase(ops_.begin() + s);
// collect input and output variables from other ops
std::vector<std::string> other_vars;
for (auto it = ops_.begin(); it != ops_.end(); it++) {
get_vars(it, other_vars);
}
// variables should be deleted
std::vector<std::string> delete_vars;
// delete_vars = cur_vars - cur_vars ^ other_input_vars
std::set_difference(cur_vars.begin(), cur_vars.end(), other_vars.begin(),
other_vars.end(),
std::inserter(delete_vars, delete_vars.end()));
// remove variables
for (size_t i = 0; i < delete_vars.size(); i++) {
auto name = delete_vars[i];
auto it = vars_.find(name);
PADDLE_ENFORCE(it != vars_.end(),
"%s is not in variable list, it should not be deleted",
name);
vars_.erase(it);
VLOG(3) << "deleting variable " << name;
}
}
ops_.erase(ops_.begin() + s, ops_.begin() + e);
}
std::vector<OpDesc *> BlockDesc::AllOps() const {
......
......@@ -89,6 +89,11 @@ class BlockDesc {
OpDesc *InsertOp(size_t index);
/*
* Remove Op and its input/output variables.
* Note that for either input or ouput variable, if it is also an input or
* output variable of other ops, we should remain it.
*/
void RemoveOp(size_t s, size_t e);
std::vector<OpDesc *> AllOps() const;
......
......@@ -186,6 +186,34 @@ class TestBlockDesc(unittest.TestCase):
all_ops.append(block.op(idx))
self.assertEqual(all_ops, [op0, op1, op2])
def test_remove_op(self):
prog = core.ProgramDesc()
self.assertIsNotNone(prog)
block = prog.block(0)
self.assertIsNotNone(block)
op1 = block.append_op()
op2 = block.append_op()
var1 = block.var("var1")
var2 = block.var("var2")
var3 = block.var("var3")
var4 = block.var("var4")
var5 = block.var("var5")
op1.set_input("X", ["var1", "var2"])
op1.set_output("Y", ["var3", "var4"])
op2.set_input("X", ["var1"])
op2.set_output("Y", ["var4", "var5"])
# remove op1, its input var2 and output var3 will be removed at the same time,
# but its input var1 and output var4 will not be removed since they are used for op2.
block.remove_op(0, 1)
all_ops = []
for idx in xrange(0, block.op_size()):
all_ops.append(block.op(idx))
self.assertEqual(all_ops, [op2])
all_vars = block.all_vars()
self.assertEqual(set(all_vars), {var1, var4, var5})
if __name__ == '__main__':
unittest.main()
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