[TF FE]: Support complex tensors for Gather, GatherV2 operations

src/frontends/tensorflow_common/src/op/gather.cpp

@@ -5,8 +5,12 @@
 #include "openvino/op/gather.hpp"
 
 #include "common_op_table.hpp"
+#include "helper_ops/complex_type_mark.hpp"
 #include "openvino/op/constant.hpp"
 #include "openvino/op/gather_nd.hpp"
+#include "openvino/op/less.hpp"
+#include "openvino/op/select.hpp"
+#include "openvino/op/subtract.hpp"
 
 using namespace std;
 using namespace ov::op;
@@ -28,8 +32,21 @@ OutputVector translate_basic_gather_op(const NodeContext& node, const ov::Output
 OutputVector translate_gather_op(const NodeContext& node) {
     // Gather has two inputs: data and indices
     // axis by which data is sliced is always equal to 0, batch_dims is always equal to 0
-    default_op_checks(node, 2, {"Gather"});
+    default_op_checks(node, 2, {"Gather"}, true);
+    auto params = node.get_input(0);
     auto axis = make_shared<v0::Constant>(element::i64, Shape{}, 0);
+    auto complex_type_mark = as_type_ptr<ComplexTypeMark>(params.get_node_shared_ptr());
+
+    if (complex_type_mark) {
+        auto complex_part_type = complex_type_mark->get_complex_part_type();
+        params = complex_type_mark->get_data();
+        auto indices = node.get_input(1);
+        auto gather = make_shared<v8::Gather>(params, indices, axis, 0);
+        set_node_name(node.get_name(), gather);
+        auto complex_gather = make_shared<ComplexTypeMark>(gather, complex_part_type);
+        return {complex_gather->output(0)};
+    }
+
     return translate_basic_gather_op(node, axis, 0);
 }
 
@@ -45,9 +62,30 @@ OutputVector translate_resource_gather_op(const NodeContext& node) {
 OutputVector translate_gather_v2_op(const NodeContext& node) {
     // GatherV2 has three inputs: data, indices, and axis by which data is sliced
     // batch_dims is an attribute and can vary
-    default_op_checks(node, 3, {"GatherV2"});
+    default_op_checks(node, 3, {"GatherV2"}, true);
+    auto params = node.get_input(0);
     auto axis = node.get_input(2);
     auto batch_dims = node.get_attribute<int64_t>("batch_dims", 0);
+    auto complex_type_mark = as_type_ptr<ComplexTypeMark>(params.get_node_shared_ptr());
+
+    if (complex_type_mark) {
+        auto complex_part_type = complex_type_mark->get_complex_part_type();
+        params = complex_type_mark->get_data();
+        auto indices = node.get_input(1);
+
+        // The axis can be negative
+        auto zero = make_shared<v0::Constant>(ov::element::i32, Shape{}, 0);
+        auto one = make_shared<v0::Constant>(ov::element::i32, Shape{}, 1);
+        auto condition = make_shared<v1::Less>(axis, zero);
+        auto axis_subtract_one = make_shared<v1::Subtract>(axis, one);
+        auto updated_axis = make_shared<v1::Select>(condition, axis_subtract_one, axis);
+
+        auto gather = make_shared<v8::Gather>(params, indices, updated_axis, batch_dims);
+        set_node_name(node.get_name(), gather);
+        auto complex_gather = make_shared<ComplexTypeMark>(gather, complex_part_type);
+        return {complex_gather->output(0)};
+    }
+
     return translate_basic_gather_op(node, axis, batch_dims);
 }
 

tests/layer_tests/tensorflow_tests/test_tf_Gather.py

@@ -77,3 +77,77 @@ def test_gather(self, params, params_type, indices_type, ie_device, precision, i
             pytest.skip("timeout issue on GPU")
         self._test(*self.create_gather_net(**params, params_type=params_type, indices_type=indices_type),
                    ie_device, precision, ir_version, temp_dir=temp_dir)
+
+
+class TestComplexGather(CommonTFLayerTest):
+    def _prepare_input(self, inputs_info):
+        assert 'real_params:0' in inputs_info
+        assert 'imag_params:0' in inputs_info
+        assert 'indices:0' in inputs_info
+        real_params_shape = inputs_info['real_params:0']
+        imag_params_shape = inputs_info['imag_params:0']
+        indices_shape = inputs_info['indices:0']
+        inputs_data = {}
+        inputs_data['real_params:0'] = rng.integers(-50, 50, real_params_shape).astype(self.params_type)
+        inputs_data['imag_params:0'] = rng.integers(-50, 50, imag_params_shape).astype(self.params_type)
+
+        inputs_data['indices:0'] = rng.integers(0, self.max_index, indices_shape).astype(self.indices_type)
+        return inputs_data
+
+
+    def create_complex_gather_net(self, params_shape, params_type, indices_shape, indices_type, axis_value, batch_dims,
+                          operation_type):
+        self.params_type = params_type
+        if params_type == str or params_type == np.str_:
+            params_type = tf.string
+        self.indices_type = indices_type
+        if batch_dims is None:
+            batch_dims = 0
+        if axis_value is None:
+            axis_value = 0
+        axis_norm = axis_value
+        if axis_norm < 0:
+            axis_norm += len(params_shape)
+        assert 0 <= axis_norm < len(params_shape), "Incorrect `axis` value for the test case"
+        self.max_index = params_shape[axis_norm]
+
+        tf.compat.v1.reset_default_graph()
+        with tf.compat.v1.Session() as sess:
+            real_params = tf.compat.v1.placeholder(params_type, params_shape, 'real_params')
+            imag_params = tf.compat.v1.placeholder(params_type, params_shape, 'imag_params')
+            complex = tf.raw_ops.Complex(real=real_params, imag=imag_params)
+
+            indices = tf.compat.v1.placeholder(indices_type, indices_shape, 'indices')
+            if operation_type == "Gather":
+                transpose = tf.raw_ops.Gather(params=complex, indices=indices)
+            elif operation_type == "GatherV2":
+                axis = tf.constant(axis_value, dtype=tf.int32)
+                transpose = tf.raw_ops.GatherV2(params=complex, indices=indices, axis=axis, batch_dims=batch_dims)
+            else:
+                assert False, "Incorrect operation type is tested"
+
+            tf.raw_ops.Real(input=transpose)
+            tf.raw_ops.Imag(input=transpose)
+            tf.compat.v1.global_variables_initializer()
+            tf_net = sess.graph_def
+
+        ref_net = None
+
+        return tf_net, ref_net
+
+    test_data_precommit = [
+        dict(params_shape=[4, 6], indices_shape=[], axis_value=None, batch_dims=None, operation_type='Gather'),
+        dict(params_shape=[3, 4, 6], indices_shape=[3, 4], axis_value=None, batch_dims=None, operation_type='Gather'),
+        dict(params_shape=[5, 4, 3], indices_shape=[5, 2, 1], axis_value=2, batch_dims=1, operation_type='GatherV2'),
+        dict(params_shape=[3, 2, 6, 4], indices_shape=[3, 2, 1, 3], axis_value=-1, batch_dims=-2,
+             operation_type='GatherV2'),
+    ]
+
+    @pytest.mark.parametrize("params", test_data_precommit)
+    @pytest.mark.parametrize("params_type", [np.float32])
+    @pytest.mark.parametrize("indices_type", [np.int32, np.int64])
+    @pytest.mark.precommit
+    @pytest.mark.nightly
+    def test_complex_gather(self, params, params_type, indices_type, ie_device, precision, ir_version, temp_dir):
+        self._test(*self.create_complex_gather_net(**params, params_type=params_type, indices_type=indices_type),
+                   ie_device, precision, ir_version, temp_dir=temp_dir)