[ONNX] Remove useless methods (#1938)

Changes:
Removed outdated methods in ONNXGraph

Author: l-bat

nncf/onnx/graph/onnx_graph.py

@@ -9,7 +9,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from typing import Callable, Dict, List, Optional, Tuple, Union
+from typing import Callable, Dict, List, Optional, Union
 
 import numpy as np
 import onnx
@@ -254,30 +254,6 @@ def get_bias_tensor_port_id(self, node: onnx.NodeProto) -> int:
             return weight_definitions.bias_port_id
         raise RuntimeError(f"The node {node} does not have bias_port_id attribute")
 
-    def _get_weight_tensor_with_reshape(self, node: onnx.NodeProto) -> Tuple[str, np.ndarray]:
-        """
-        Returns node's weight tensor name and its value in the case when reshape node is placed after the weight.
-        The returned weight tensor will be reshaped according to a shape attribute of the reshape node.
-
-        :param node: Reshape node, whose input is weight tensor.
-        :return: The weight tensor name and its value with applied the reshape operation.
-        """
-        tensor_name = node.output[0]
-        shape = self.get_initializers_value(node.input[1])
-        tensor_value = self.get_initializers_value(node.input[0])
-        reshaped_tensor_value = tensor_value.reshape(shape)
-        return tensor_name, reshaped_tensor_value
-
-    def _get_tensor_from_zero_input(self, node: onnx.NodeProto) -> Tuple[str, np.ndarray]:
-        """
-        Returns the weight tensor name and its value, which is located on the 0-index input port of the node.
-
-        :param node: Node, which takes on the 0-index input port id the weight tensor.
-        :return: The weight tensor name and its value.
-        """
-        tensor_name = self.get_initializer(node.input[0]).name
-        return tensor_name, self.get_initializers_value(tensor_name)
-
     def get_node_index(self, node_name: str) -> int:
         """
         Returns the node index in the model.