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Preserve disconnected Constant->Result subgraphs in TensorFlow models #32269

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Preserve disconnected Constant->Result subgraphs in TensorFlow models #32269

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8d2b4ed
[TF FE] Fix CVS-140357: Preserve Constant->Result subgraphs in ConstT…
evkotov Oct 1, 2025
bd6a187
added unit tests
evkotov Oct 1, 2025
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11 changes: 10 additions & 1 deletion src/frontends/tensorflow/tests/convert_tricky_models.cpp
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Expand Up @@ -326,7 +326,16 @@ TEST_F(FrontEndConversionWithReferenceTestsF, ModelWithConstResultSubgraphs) {
auto inverse_order = make_shared<v0::Constant>(element::i64, Shape{4}, vector<int64_t>{0, 2, 3, 1});
auto transpose_to_nhwc = make_shared<v1::Transpose>(max_pool, inverse_order);

model_ref = make_shared<Model>(OutputVector{transpose_to_nhwc}, ParameterVector{x});
// These constants (Adam/beta_1, Adam/beta_2) are not connected to the main graph
auto beta_1 = make_shared<v0::Constant>(element::f32, Shape{}, vector<float>{0.8999999761581421f});
auto result_beta_1 = make_shared<v0::Result>(beta_1);

auto beta_2 = make_shared<v0::Constant>(element::f32, Shape{}, vector<float>{0.9990000128746033f});
auto result_beta_2 = make_shared<v0::Result>(beta_2);

auto result_main = make_shared<v0::Result>(transpose_to_nhwc);

model_ref = make_shared<Model>(ResultVector{result_main, result_beta_1, result_beta_2}, ParameterVector{x});
}
}

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4 changes: 1 addition & 3 deletions src/frontends/tensorflow_common/src/helper_transforms/const_to_result_remover.cpp
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Expand Up @@ -20,11 +20,9 @@ bool ConstToResultRemover::run_on_model(const std::shared_ptr<ov::Model>& m) {
// no need to apply it for sub-graphs!
ResultVector results_to_remove;
// look for isolated UnsupportedConst->Result sub-graphs to remove
// also, find isolated Constant->Result sub-graphs to remove
for (const auto& result : m->get_results()) {
auto unsupported_const = as_type_ptr<UnsupportedConstant>(result->get_input_node_shared_ptr(0));
auto const_node = as_type_ptr<v0::Constant>(result->get_input_node_shared_ptr(0));
if (unsupported_const || const_node) {
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we have a model that contains multiple isolated Constants (tens of them) that impact compilation times of the plugin.
This was a reason to delete such isolated constants.

if (unsupported_const) {
results_to_remove.push_back(result);
}
}
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