opset.py

# Copyright (c) 2019  PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from x2paddle.decoder.onnx_decoder import ONNXGraph, ONNXGraphNode, ONNXGraphDataNode
from x2paddle.core.graph import GraphNode
from x2paddle.core.util import *
from functools import reduce
import numpy as np
import onnx
import onnx.numpy_helper as numpy_helper
from onnx.mapping import TENSOR_TYPE_TO_NP_TYPE
import logging as _logging
from collections import OrderedDict
import math
import os
import copy
import sys
import shutil

_logger = _logging.getLogger(__name__)


def _const_weight_or_none(node, necessary=False):
    if 'Constant' in node.layer_type:
        return node.value
    if isinstance(node, ONNXGraphDataNode):
        return node.weight
    if necessary:
        assert '{} should be an initializer or Constant operator.'.format(
            node.name)
    return None


def _rename_or_remove_weight(weights, origin_name, target_name=None, is_remove=True):
    ''' 
    Rename parameters by Paddle's naming rule of parameters.

    Args:
        weights(dict[String:np.ndarray]): Dict stored paramters, the key in weights is name of parameter.
        origin_name(String): Name of parameter to rename or remove.
        target_name(String, optional): if target_name is not None, add new key-value pair 
            {target_name:weights[origin_name]} to weights, and target_name must follow paddle's 
            naming rule of parameters. Default: None.
        is_remove: if is_remove is True, remove origin key-value pair. Default: True.
    Returns:
        None
    '''   
    if origin_name not in weights:
        raise KeyError('{} not a key in {}'.format(origin_name, weights))
    if is_remove:
        # remove weight
        data = weights.pop(origin_name)
    else:
        data = weights[origin_name]
    if target_name is not None:
        # rename weight
        weights[target_name] = data

def _is_static_shape(shape):
    negtive_dims = 0
    error_dims = 0
    for dim in shape:
        if dim < 0:
            negtive_dims += 1
        if dim < -1:
            error_dims += 1
    if negtive_dims > 1:
        return False
    if error_dims > 0:
        return False
    return True


def _get_same_padding(in_size, kernel_size, stride):
    new_size = int(math.ceil(in_size * 1.0 / stride))
    pad_size = (new_size - 1) * stride + kernel_size - in_size
    pad0 = int(pad_size / 2)
    pad1 = pad_size - pad0
    return [pad0, pad1]


def print_mapping_info(func):
    def run_mapping(*args, **kwargs):
        node = args[1]
        try:
            res = func(*args, **kwargs)
        except:
            print("convert failed node:{}, op_type is {}".format(
                node.name[9:], node.layer_type))
            raise
        else:
            return res

    return run_mapping


class OpSet9():
    elementwise_ops = {
        'Add': 'paddle.add',
        'Div': 'paddle.divide',
        'Sub': 'paddle.subtract',
        'Mul': 'paddle.multiply',
        'Pow': 'paddle.pow',
    }

    directly_map_ops = {
        'Ceil': ['paddle.ceil'],
        # reduce function
        'ReduceMean': ['paddle.mean',
                       dict(axes='axis', keepdims='keepdim'), 
                       dict(axes=None, keepdims=1)],
        'ReduceSum': ['paddle.sum', 
                      dict(axes='axis', keepdims='keepdim'), 
                      dict(axes=None, keepdims=1)],
        'ReduceMin': ['paddle.min', 
                      dict(axes='axis', keepdims='keepdim'), 
                      dict(axes=None, keepdim=1)],
        'ReduceMax': ['paddle.max', 
                      dict(axes='axis', keepdims='keepdim'), 
                      dict(axes=None, keepdim=1)],
        'ReduceProd': ['paddle.prod', 
                      dict(axes='axis', keepdims='keepdim'), 
                      dict(axes=None, keepdim=1)],
        # active function
        'Relu': ['paddle.nn.ReLU'],
        'LeakyRelu': ['paddle.nn.LeakyReLU', 
                      dict(alpha='negative_slope'), 
                      dict(negative_slope=.01)],
        'Elu': ['paddle.nn.functional.elu', 
                dict(alpha='alpha'), 
                dict(alpha=1.)],
        'ThresholdedRelu': ['paddle.nn.functional.thresholded_relu', 
                            dict(alpha='threshold'),
                            dict(alpha=1.)],
        'Tanh': ['paddle.nn.Tanh'],
        'Sigmoid': ['paddle.nn.Sigmoid'],
        'Softsign': ['paddle.nn.Softsign'],
        'Softplus': ['paddle.nn.Softplus', 
                     dict(threshold='threshold'), 
                     dict(threshold=float(sys.maxsize))],
        'Exp': ['paddle.exp'],
        'Log': ['paddle.log'],
        'LogSoftmax': ['paddle.nn.functional.log_softmax', 
                    dict(axis='axis'), 
                    dict(axis=1)],
        'Softmax': ['paddle.nn.Softmax', 
                    dict(axis='axis'), 
                    dict(axis=1)],
        'Sqrt': ['paddle.sqrt'],
        'Floor': ['paddle.floor'],
        'Abs': ['paddle.abs'],
        'Erf': ['paddle.erf'],
    }

    def __init__(self, decoder, paddle_graph):
        super(OpSet9, self).__init__()
        self.graph = decoder.graph
        self.paddle_graph = paddle_graph
        self.input_index = 0
        self.inputs_info = dict()
        self.weights = dict()
        self.nn_name2id = dict()
        self.done_weight_list = list()

    @print_mapping_info
    def directly_map(self, node, *args, **kwargs):
        inputs = node.layer.input
        assert len(inputs) == 1, 'directly_map error with multi inputs'
        input = self.graph.get_input_node(node, idx=0, copy=True)
        onnx_attrs = node.attr_map
        if '' in onnx_attrs:
            onnx_attrs.pop('')
        if '_' in onnx_attrs:
            onnx_attrs.pop('_')
        op_info = self.directly_map_ops[node.layer_type]
        paddle_op = op_info[0]
        layer_attrs = dict()
        if len(op_info) > 1:
            attrs_name_map_dict = op_info[1]
            for onnx_attr_name, pd_attr_name in attrs_name_map_dict.items():
                if onnx_attr_name in onnx_attrs:
                    layer_attrs[pd_attr_name] = onnx_attrs[onnx_attr_name]
                else:
                    layer_attrs[pd_attr_name] = op_info[2][onnx_attr_name]
        if paddle_op.startswith("paddle.nn") and 'functional' not in paddle_op:
            op_name = paddle_op[10:].lower()
            op_name = name_generator(op_name, self.nn_name2id)
            output_name = node.name
            layer_outputs = [op_name, output_name]

            self.paddle_graph.add_layer(
                kernel=paddle_op,
                inputs={"x": input.name},
                outputs=layer_outputs,
                **layer_attrs)
        else:
            self.paddle_graph.add_layer(
                kernel=paddle_op,
                inputs={"x": input.name},
                outputs=[node.name],
                **layer_attrs)        
       
            
    @print_mapping_info
    def elementwise_map(self, node):
        op_type = self.elementwise_ops[node.layer_type]
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_y = self.graph.get_input_node(node, idx=1, copy=True)
        inputs_dict = {'x': val_x.name, 
                       'y': val_y.name}
        self.paddle_graph.add_layer(
            op_type, 
            inputs=inputs_dict, 
            outputs=[node.name])

    @print_mapping_info
    def place_holder(self, node):
        shape = node.out_shapes[0]
        for i, dim_shape in enumerate(shape):
            if dim_shape == 0 and i == 0:
                shape[i] = 1
            if dim_shape == 0 and i != 0:
                assert 'shape of input is not assigned'
        self.paddle_graph.add_layer(
            kernel="paddle.to_tensor",
            inputs={},
            outputs=[node.name],
            data="x{}".format(self.input_index))
        self.inputs_info["x{}".format(self.input_index)] = [shape, node.dtype]
        self.input_index += 1

    @print_mapping_info
    def create_parameter(self, node, parameter=None):
        if parameter is not None:
            node = parameter
        dtype = node.dtype
        shape = node.out_shapes[0]
        if hasattr(node.weight, "shape") and len(node.weight.shape) == 0:
            self.paddle_graph.add_layer(
                "paddle.full", 
                inputs={}, 
                outputs=[node.name],
                dtype=string(dtype),
                shape=[1],
                fill_value=node.weight)
        else:
            self.weights[node.name] = node.weight
            self.paddle_graph.add_layer(
                "self.create_parameter",
                inputs={},
                outputs=[node.name],
                shape=shape,
                attr=string(node.name),
                dtype=string(dtype),
                default_initializer="paddle.nn.initializer.Constant(value=0.0)")       

    def _pad_if_asymmetric(self, node, pads, val_name):  # pads: SSEE
        assert len(pads) & 1 == 0
        symmetric = True
        ndims = len(pads) // 2
        for idx_dim in range(ndims):
            if pads[idx_dim] != pads[ndims + idx_dim]:
                symmetric = False
                break
        if symmetric:
            return pads[:ndims], val_name
        val_padded = self.Pad(node, op_independent=False)
        return [0] * ndims, val_padded

    def _interpolate(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        inputs = {'x': val_x.name}
        attrs = dict()
        if node.layer_type == 'Resize':
            if len(node.layer.input) == 2:
                # opset 10
                val_scales = self.graph.get_input_node(node, idx=1, copy=True)
                # TODO(syf): paddle.nn.functional.interpolate will support the length  
                # which is the same as the rank of input.
                attrs['scale_factor'] = self.weights[val_scales.name].tolist()[2:]
            elif len(node.layer.input) == 3:
                # opset 11
                val_scales = self.graph.get_input_node(node, idx=2, copy=True)
                # TODO(syf): paddle.nn.functional.interpolate will support the length  
                # which is the same as the rank of input.
                attrs['scale_factor'] = self.weights[val_scales.name].tolist()[2:]
            elif len(node.layer.input) == 4:
                # opset 11
                val_sizes = self.graph.get_input_node(node, idx=3, copy=True)
                var_nc, var_hw = val_sizes.name + '_nc', val_sizes.name + '_hw'
                self.paddle_graph.add_layer(
                    'paddle.split',
                    inputs={"x": val_sizes.name},
                    outputs=[var_nc, var_hw],
                    num_or_sections=[2, 2],
                    axis=0)
                self.paddle_graph.add_layer(
                    "paddle.cast",
                    inputs={"x": var_hw},
                    outputs=[var_hw],
                    dtype=string('int32'))
                inputs['size'] = var_hw
                attrs = {"align_corners": False,
                         "mode": string(node.get_attr('mode', 'nearest'))}
                self.paddle_graph.add_layer(
                    kernel="paddle.nn.functional.interpolate",
                    inputs=inputs,
                    outputs=[node.name],
                    **attrs)
                return
        elif node.layer_type == 'Upsample':
            val_scales = self.graph.get_input_node(node, idx=1, copy=True)
            self.paddle_graph.add_layer(
                "paddle.slice",
                inputs={"input": val_scales.name},
                outputs=[val_scales.name],
                axes=[0],
                starts=[2],
                ends=[4])
            inputs['scale_factor'] = val_scales.name
 
        mode = node.get_attr('mode', 'nearest')
        attrs.update({"align_corners": False,
                      "mode": string(mode),
                      "align_mode": 1})
        val_x_shape = val_x.out_shapes[0]
        if mode == "linear" and len(val_x_shape) == 4:
            attrs["mode"] = string("bilinear")
            attrs["align_corners"] = True
        self.paddle_graph.add_layer(
            kernel="paddle.nn.functional.interpolate",
            inputs=inputs,
            outputs=[node.name],
            **attrs)
        
    @print_mapping_info
    def HardSigmoid(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        alpha = node.get_attr('alpha', 0.2)
        beta = node.get_attr('beta', 0.5)
        self.paddle_graph.add_layer(
            kernel="paddle.scale",
            inputs={"x": val_x.name},
            outputs=[node.name + "_val"],
            scale=alpha,
            bias=beta)
        self.paddle_graph.add_layer(
            kernel="paddle.clip",
            inputs={"x": node.name + "_val"},
            outputs=[node.name],
            min=0.0,
            max=1.0)  
        
    @print_mapping_info
    def Shape(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        self.paddle_graph.add_layer(
            kernel="paddle.shape",
            inputs={"input": val_x.name},
            outputs=[node.name])
        self.paddle_graph.add_layer(
                'paddle.cast',
                inputs={"x": node.name},
                outputs=[node.name],
                dtype=string('int64'))   

    @print_mapping_info
    def RoiAlign(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_rois = self.graph.get_input_node(node, idx=1, copy=True)

        pooled_height = node.get_attr('output_height')
        pooled_width = node.get_attr('output_width')
        spatial_scale = node.get_attr('spatial_scale')
        sampling_ratio = node.get_attr('sampling_ratio')
        layer_attrs = {
            'pooled_height': pooled_height,
            'pooled_width': pooled_width,
            'spatial_scale': spatial_scale,
            'sampling_ratio': sampling_ratio,
        }
        self.paddle_graph.add_layer(
            'paddle.fluid.layers.roi_align',
            inputs={'input': val_x.name,
                    'rois': val_rois.name},
            outputs=[node.name],
            **layer_attrs)
                       

    @print_mapping_info
    def MaxRoiPool(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_rois = self.graph.get_input_node(node, idx=1, copy=True)

        spatial_scale = node.get_attr('spatial_scale')
        pooled_height, pooled_width = node.get_attr('pooled_shape')
        layer_attrs = {
            'pooled_height': pooled_height,
            'pooled_width': pooled_width,
            'spatial_scale': spatial_scale,
        }
        self.paddle_graph.add_layer(
            'paddle.fluid.layers.roi_pool',
            inputs={'input': val_x.name,
                    'rois': val_rois.name},
            outputs=[node.name],
            **layer_attrs)

    @print_mapping_info
    def Pad(self, node, op_independent=True):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        pads = node.get_attr('pads')
        is_pads_attr = True
        if pads is None:
            val_pad = self.graph.get_input_node(node, idx=1, copy=True)
            pad_shape = val_pad.out_shapes[0]
            is_pads_attr = False
            pads = _const_weight_or_none(val_pad)
            if pads is not None:
                is_pads_attr = True
        mode = node.get_attr('mode', 'constant')
        value = node.get_attr('value', 0.)
        data_shape = val_x.out_shapes[0]
        output_shape = node.out_shapes[0]
        assume_pad = False
        layer_attrs = {}
        layer_attrs['mode'] = string(mode)
        layer_attrs['value'] = value
        if not op_independent:
            output_name = node.name + '_paded'
        else:
            output_name = node.name
        nn_op_name = name_generator("pad", self.nn_name2id)
        layer_outputs = [nn_op_name, output_name]
        if is_pads_attr:
            paddings = []
            if len(pads) in [2, 4, 6]:
                if data_shape:
                    assume_pad |= data_shape and 2 * (len(data_shape) - 2) == len(pads) # NCHW
                if output_shape:
                    assume_pad |= output_shape and 2 * (len(output_shape) - 2) == len(pads)  # NCHW
                if assume_pad:
                    paddle_op = 'paddle.nn.Pad{}D'.format(len(output_shape) - 2)
                    paddings = np.array(pads).reshape(
                        (2, -1)).transpose().astype("int32")
                    paddings = np.flip(paddings, axis=0).flatten().tolist()
                    layer_attrs['padding'] = paddings
                else:
                    if data_shape:
                        assume_pad |= data_shape and 2 * len(data_shape) == len(pads) # NCHW
                    if output_shape:
                        assume_pad |= output_shape and 2 * len(output_shape) == len(pads)  # NCHW
                    if assume_pad:
                        paddle_op = 'paddle.nn.functional.pad'
                        paddings = np.array(pads).reshape(
                            (2, -1)).transpose().astype("int32").flatten().tolist()
                        layer_attrs['pad'] = paddings
                    else:
                        raise Exception("The padding value {} is wrong!".format(pads))
            elif len(pads) == 8:
                if data_shape:
                    assume_pad |= data_shape and 2 * len(data_shape) == len(pads) # NCHW
                if output_shape:
                    assume_pad |= output_shape and 2 * len(output_shape) == len(pads)  # NCHW
                if assume_pad:
                    paddle_op = 'paddle.nn.Pad2D'
                    paddings = np.array(pads).reshape(
                        (2, -1)).transpose().astype("int32")
                    paddings = np.flip(paddings, axis=0).flatten().tolist()
                    if sum(paddings[:4]) == 0:
                        paddings = paddings[4:]
                        layer_attrs['padding'] = paddings
                    else:
                        layer_attrs["pad"] = paddings
                        paddle_op = "custom_layer:PadAllDim4WithOneInput"
            else:
                 raise Exception("The padding value {} is wrong!".format(pads))
            self.paddle_graph.add_layer(
                paddle_op, 
                inputs={'x': val_x.name}, 
                outputs=layer_outputs[1:] if paddle_op == 'paddle.nn.functional.pad' else layer_outputs, 
                **layer_attrs)
            if not op_independent:
                return node.name + '_paded'
        else:
            pads_len = val_pad.out_shapes[0][0]
            if pads_len in [2, 4, 6]:
                if data_shape:
                    assume_pad |= data_shape and 2 * (len(data_shape) - 2) == pads_len # NCHW
                if output_shape:
                    assume_pad |= output_shape and 2 * (len(output_shape) - 2) == pads_len  # NCHW 
                if assume_pad:
                    if pads_len == 2:
                        data_format = "NCL"
                    elif pads_len == 4:
                        data_format = "NCHW"
                    else:
                        data_format = "NCDHW"
                    self.paddle_graph.add_layer(
                        "custom_layer:PadWithTwoInput", 
                        inputs={'x': val_x.name, 'pad': val_pad.name}, 
                        outputs=layer_outputs,
                        value=value,
                        mode=string(mode),
                        data_format=string(data_format))
                else:
                    if data_shape:
                        assume_pad |= data_shape and 2 * len(data_shape) == pads_len # NCHW
                    if output_shape:
                        assume_pad |= output_shape and 2 * len(output_shape) == pads_len  # NCHW
                    if assume_pad:
                        if pads_len == 4:
                            self.paddle_graph.add_layer(
                                "custom_layer:PadAllDim2", 
                                inputs={'x': val_x.name, 'pad': val_pad.name}, 
                                outputs=layer_outputs, 
                                value=value,
                                mode=string(mode))
                        else:
                            raise Exception("The padding value is wrong!")
            elif pads_len == 8:
                if data_shape:
                    assume_pad |= data_shape and 2 * len(data_shape) == pads_len # NCHW
                if output_shape:
                    assume_pad |= output_shape and 2 * len(output_shape) == pads_len  # NCHW
                if assume_pad:
                    self.paddle_graph.add_layer(
                        "custom_layer:PadAllDim4", 
                        inputs={'x': val_x.name, 'pad': val_pad.name}, 
                        outputs=layer_outputs, 
                        value=value,
                        mode=string(mode))
            else:
                print(pads_len)
                raise Exception("The padding value is wrong!")   
            if not op_independent:
                return node.name + '_paded'

    @print_mapping_info
    def Unsqueeze(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        axes = node.get_attr('axes')
        layer_attrs = {'axis': axes}
        if len(val_x.out_shapes[0]) == 0:
            if node.name:
                self.paddle_graph.add_layer(
                    'paddle.reshape',
                    inputs={"x": val_x.name},
                    outputs=[node.name],
                    shape=[1])
        else:
            self.paddle_graph.add_layer(
                'paddle.unsqueeze', 
                inputs={"x": val_x.name}, 
                outputs=[node.name],
                **layer_attrs)

    @print_mapping_info
    def Shrink(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        bias = node.get_attr('bias')
        lambd = node.get_attr('lambd')
        assert bias == 0.0, 'not support bias!=0'
        self.paddle_graph.add_layer(
            'paddle.nn.functional.hardshrink', 
            inputs={"x": val_x.name}, 
            outputs=[node.name], 
            threshold=lambd)

    @print_mapping_info
    def Constant(self, node):
        val_output = self.graph.get_node(node.layer.output[0], copy=True)

        value = node.get_attr('value')
        dtype = np.dtype(value.dtype)
        output_dtype = val_output.dtype
        if output_dtype:
            assert dtype == output_dtype, 'tensor dtype unmatches storage dtype'

        shape = node.get_attr('shape', None)

        if shape is None:
            shape = val_output.out_shapes[0]
        if shape is None:
            shape = list(value.shape)
            _logger.warning('in (Constant -> %s): '
                            'attribute "shape" of %s not inferred, '
                            'using value as 1-D tensor may lead to fails',
                            val_output.name, val_output.name)
        if len(value) == 1:
            value = value.tolist()
            value = value[0]
            self.paddle_graph.add_layer(
                "paddle.full", 
                inputs={}, 
                outputs=[node.name],
                dtype=string(dtype),
                shape=[1],
                fill_value=value)
        else:
            value = np.reshape(value, shape)
            self.weights[node.name] = value
            self.paddle_graph.add_layer(
                "self.create_parameter",
                inputs={},
                outputs=[node.name],
                shape=shape,
                attr=string(node.name),
                dtype=string(dtype),
                default_initializer="paddle.nn.initializer.Constant(value=0.0)")

    @print_mapping_info
    def Resize(self, node):
        self._interpolate(node)

    @print_mapping_info
    def Upsample(self, node):
        self._interpolate(node)

    @print_mapping_info
    def InstanceNormalization(self, node):
        op_name = name_generator("instanse_norm", self.nn_name2id)
        output_name = node.name
        layer_outputs = [op_name, output_name]
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_scale = self.graph.get_input_node(node, idx=1, copy=True)
        val_b = self.graph.get_input_node(node, idx=2, copy=True)
        epsilon = node.get_attr('epsilon', 1e-5)
        self.weights[op_name+'.scale'] = self.weights[val_scale.name]
        self.weights[op_name+'.bias'] = self.weights[val_b.name]
        layer_attrs = {
            'num_features': node.out_shapes[0][1],
            'epsilon': epsilon,
        }
        dim = len(val_x.out_shapes[0])
        if dim == 3:
            paddle_op = "paddle.nn.InstanceNorm1D"
        elif dim == 4:
            paddle_op = "paddle.nn.InstanceNorm2D"
        elif dim == 5:
            paddle_op = "paddle.nn.InstanceNorm3D"
        else:
            raise Exception("The paddle only support 2D, 3D, 4D or 5D input in InstanceNormalization.")
        self.paddle_graph.add_layer(
            paddle_op, 
            inputs={"x": val_x.name}, 
            outputs=layer_outputs, 
            **layer_attrs)

    @print_mapping_info
    def Expand(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_shape = self.graph.get_input_node(node, idx=1, copy=True)
        val_x_dtype = val_x.dtype
        name_ones = node.name + '_ones'
        attr_ones = {
            'shape': val_shape.name,
            'dtype': string(val_x_dtype),
            'fill_value': 1
        }
        self.paddle_graph.add_layer(
            'paddle.full',
            inputs={},
            outputs=[name_ones],
            **attr_ones)
        inputs_dict = {'x': name_ones, 
                       'y': val_x.name}
        self.paddle_graph.add_layer(
            'paddle.multiply',
            inputs=inputs_dict,
            outputs=[node.name])

    @print_mapping_info
    def Gather(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        indices = self.graph.get_input_node(node, idx=1, copy=True)
        indices_shape = indices.out_shapes[0]
        axis = node.get_attr('axis', 0)
        #assert len(
        #    indices_shape) <= 2, "Gather op don't support dim of indice >2 "
        if axis == 0 and len(indices_shape) <= 1:
            if len(val_x.out_shapes[0]) <= 1:
                self.paddle_graph.add_layer(
                    'paddle.gather',
                    inputs={'x': val_x.name,
                            'index': indices.name},
                    outputs=[node.name])
            elif len(val_x.out_shapes[0]) > 1:
                if len(indices_shape) == 0:
                    gather_ = node.name + '_1'
                    self.paddle_graph.add_layer(
                        'paddle.gather',
                        inputs={'x': val_x.name,
                                'index': indices.name},
                        outputs=[gather_])
                    self.paddle_graph.add_layer(
                        'paddle.squeeze',
                        inputs={'x': gather_},
                        outputs=[node.name],
                        axis=[0])
                else:
                    self.paddle_graph.add_layer(
                        'paddle.gather',
                        inputs={'x': val_x.name,
                                'index': indices.name},
                        outputs=[node.name])
        elif axis > 0 and len(indices_shape) <= 1:
            perm = list(range(len(val_x.out_shapes[0])))
            perm = [axis] + perm[:axis] + perm[axis + 1:]
            name_trans = val_x.name + '_trans'
            self.paddle_graph.add_layer(
                'paddle.transpose',
                inputs={"x": val_x.name},
                outputs=[name_trans],
                perm=perm)
            self.paddle_graph.add_layer(
                'paddle.gather',
                inputs={'x': name_trans,
                        'index': indices.name},
                outputs=[node.name])
            self.paddle_graph.add_layer(
                'paddle.transpose', 
                inputs={"x": node.name}, 
                outputs=[node.name], 
                perm=perm)
            if len(indices_shape) < 1:
                self.paddle_graph.add_layer(
                    'paddle.squeeze',
                    inputs={'x': node.name},
                    outputs=[node.name],
                    axis=[axis])
        elif axis == 0 and len(indices_shape) > 1:
            if val_x.out_shapes[0] is not None and isinstance(
                    val_x, ONNXGraphDataNode):
                indices_cast = indices.name + '_cast'
                self.paddle_graph.add_layer(
                    'paddle.cast',
                    inputs={"x": indices.name},
                    outputs=[indices_cast],
                    dtype=string('int64'))
                op_name = name_generator("embedding", self.nn_name2id)
                output_name = node.name
                layer_outputs = [op_name, output_name]
                self.weights[op_name + '.weight'] = _const_weight_or_none(val_x)
                self.paddle_graph.add_layer(
                    'paddle.nn.Embedding',
                    inputs={"x": indices_cast},
                    outputs=layer_outputs,
                    num_embeddings=val_x.out_shapes[0][0],
                    embedding_dim=val_x.out_shapes[0][1])
            else:
                from functools import reduce
                reshape_shape = reduce(lambda x, y: x * y, indices_shape)
                indices_reshape = indices.name + '_shape'
                self.paddle_graph.add_layer(
                    'paddle.reshape',
                    inputs={"x": indices.name},
                    outputs=[indices_reshape],
                    shape=[reshape_shape, ])

                perm = list(range(len(val_x.out_shapes[0])))
                self.paddle_graph.add_layer(
                    'paddle.gather',
                    inputs={'x': val_x.name,
                            'index': indices_reshape},
                    outputs=[node.name])
                val_x_shape = val_x.out_shapes[0]
                reshaped_shape = []
                for i in perm:
                    reshaped_shape.append(indices_shape[i])
                for i in val_x_shape[:axis] + val_x_shape[axis + 1:]:
                    reshaped_shape.append(i)
                self.paddle_graph.add_layer(
                    'paddle.reshape',
                    inputs={"x": node.name},
                    outputs=[node.name],
                    shape=reshaped_shape)
        elif axis > 0 and len(indices_shape) > 1:
            from functools import reduce
            reshape_shape = reduce(lambda x, y: x * y, indices_shape)
            indices_reshape = indices.name + '_shape'
            self.paddle_graph.add_layer(
                'paddle.reshape',
                inputs={"x": indices.name},
                outputs=[indices_reshape],
                shape=[reshape_shape, ])

            perm = list(range(len(val_x.out_shapes[0])))
            perm = [axis] + perm[:axis] + perm[axis + 1:]
            name_trans = val_x.name + '_transpose'
            self.paddle_graph.add_layer(
                'paddle.transpose',
                inputs={"x": val_x.name},
                outputs=[name_trans],
                perm=perm)
            self.paddle_graph.add_layer(
                'paddle.gather',
                inputs={'x': name_trans,
                        'index': indices_reshape},
                outputs=[node.name])
            input_transpose = node.name + '_transpose'
            self.paddle_graph.add_layer(
                'paddle.transpose',
                inputs={"x": node.name},
                outputs=[input_transpose],
                perm=perm)
            val_x_shape = val_x.out_shapes[0]
            reshaped_shape = []
            for i in perm:
                reshaped_shape.append(indices_shape[i])
            for i in val_x_shape[:axis] + val_x_shape[axis + 1:]:
                reshaped_shape.append(i)
            self.paddle_graph.add_layer(
                'paddle.reshape',
                inputs={"x": input_transpose},
                outputs=[node.name],
                shape=reshaped_shape)

    @print_mapping_info
    def ScatterND(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        indices = self.graph.get_input_node(node, idx=1, copy=True)
        updates = self.graph.get_input_node(node, idx=2, copy=True)
        if len(indices.out_shapes[0]) == 1:
            self.paddle_graph.add_layer(
                'paddle.scatter',
                inputs={'x': val_x.name,
                        'index': indices.name,
                        'updates': updates.name},
                outputs=[node.name])
        else:
            input_inner_indices = node.name + '_input_inner_indices'
            shape = val_x.out_shapes[0]
            self.paddle_graph.add_layer(
                'paddle.reshape',
                inputs={"x": indices.name},
                outputs=[indices.name],
                shape=indices.out_shapes[0])

            zeros_like_val_x = val_x.name + '_zeros'
            self.paddle_graph.add_layer(
                'paddle.zeros_like',
                inputs={"x": val_x.name},
                outputs=[zeros_like_val_x])
            self.paddle_graph.add_layer(
                'paddle.scatter_nd_add',
                inputs={
                    'x': zeros_like_val_x,
                    'index': indices.name,
                    'updates': updates.name
                },
                outputs=[input_inner_indices])
            indices_mask = node.name + '_indices_mask'
            constant_minus_one = node.name + '_constant_minus_one'
            # full_like support create tensor shape like input tensor
            self.paddle_graph.add_layer(
                'paddle.full_like',
                inputs={"x": updates.name},
                outputs=[constant_minus_one],
                dtype=string(updates.dtype),
                fill_value=-1)
            self.paddle_graph.add_layer(
                'paddle.scatter_nd_add',
                inputs={
                    'x': zeros_like_val_x,
                    'index': indices.name,
                    'updates': constant_minus_one
                },
                outputs=[indices_mask])
            constant_one = node.name + '_constant_1'
            # full_like support create tensor shape like input tensor
            self.paddle_graph.add_layer(
                'paddle.full_like',
                inputs={"x": val_x.name},
                outputs=[constant_one],
                dtype=string(val_x.dtype),
                fill_value=1)
            input_out_indices_mask = node.name + '_input_out_indices_mask'
            self.paddle_graph.add_layer(
                "paddle.add",
                inputs={"x": indices_mask,
                        "y": constant_one},
                outputs=[input_out_indices_mask])

            input_out_indices = node.name + '_input_out_indices'
            self.paddle_graph.add_layer(
                "paddle.multiply",
                inputs={"x": val_x.name,
                        "y": input_out_indices_mask},
                outputs=[input_out_indices])

            self.paddle_graph.add_layer(
                "paddle.add",
                inputs={"x": input_inner_indices,
                        "y": input_out_indices},
                outputs=[node.name])

    @print_mapping_info
    def Range(self, node):
        val_start = self.graph.get_input_node(node, idx=0, copy=True)
        val_limit = self.graph.get_input_node(node, idx=1, copy=True)
        val_delta = self.graph.get_input_node(node, idx=2, copy=True)
        dtype = val_start.dtype
        inputs = {'start': val_start.name, 
                  'end': val_limit.name, 
                  'step': val_delta.name}
        self.paddle_graph.add_layer(
            'paddle.arange',
            inputs=inputs,
            outputs=[node.name],
            dtype=string(dtype))

    @print_mapping_info
    def Slice(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        starts, ends, axes, steps = None, None, None, None
        layer_attrs = {}
        if len(node.inputs) > 1:
            starts = self.graph.get_input_node(node, idx=1, copy=True)
            ends = self.graph.get_input_node(node, idx=2, copy=True)
            starts_value = _const_weight_or_none(starts)
            if starts_value is not None:
                starts_value = starts_value.tolist()
            ends_value = _const_weight_or_none(ends)
            if ends_value is not None:
                ends_value = ends_value.tolist()
            if len(node.inputs) > 2:
                s_len = len(val_x.out_shapes[0])
                axes = list(range(s_len))
            if len(node.inputs) > 3:
                axes_node = self.graph.get_input_node(node, idx=3, copy=True)
                axes = _const_weight_or_none(axes_node, necessary=True).tolist()
            if len(node.inputs) > 4:
                steps = self.graph.get_input_node(node, idx=4, copy=True)
                steps = _const_weight_or_none(steps).tolist()
            
            layer_attrs = {
                "axes": axes,
                "starts": starts.name,
                "ends": ends.name
            }
            if starts_value is not None and ends_value is not None and axes is not None:
                starts_value = starts_value.copy()
                ends_value = ends_value.copy()
                for idx in range(len(ends_value)):
                    if starts_value[idx] >= val_x.out_shapes[0][axes[idx]]:
                        starts_value[idx] = val_x.out_shapes[0][axes[idx]] - 1
                        ends_value[idx] = val_x.out_shapes[0][axes[idx]]
                        starts_value[idx] = val_x.out_shapes[0][axes[idx]] - 1
                    elif ends_value[idx] > 2**31 - 1:
                        ends_value[idx] = 2**31 - 1
                layer_attrs = {
                    "axes": axes,
                    "starts": starts_value,
                    "ends": ends_value
                }
            else:
                if starts.dtype != 'int32':
                    starts_cast = starts.name + '_cast'
                    self.paddle_graph.add_layer(
                        'paddle.cast',
                        inputs={"x": starts.name},
                        outputs=[starts_cast],
                        dtype=string('int32'))
                    layer_attrs['starts'] = starts_cast
                if ends.dtype != 'int32':
                    ends_cast = ends.name + '_cast'
                else:
                    ends_cast = ends.name
                self.paddle_graph.add_layer(
                    'paddle.cast',
                    inputs={"x": ends.name},
                    outputs=[ends_cast],
                    dtype=string('int32'))
                layer_attrs['ends'] = ends_cast
        else:
            starts = node.get_attr('starts')
            ends = node.get_attr('ends')
            axes = node.get_attr('axes')
            for idx in range(len(ends)):
                if ends[idx] > 2**31 - 1:
                    ends[idx] = 2**31 - 1
            layer_attrs = {"axes": axes, "starts": starts, "ends": ends}


        if steps is not None:
            layer_attrs['strides'] = steps
            self.paddle_graph.add_layer(
                'paddle.strided_slice', 
                inputs={"x": val_x.name}, 
                outputs=[node.name], 
                **layer_attrs)
        else:
            self.paddle_graph.add_layer(
                'paddle.slice', 
                inputs={"input": val_x.name}, 
                outputs=[node.name],  
                **layer_attrs)

    @print_mapping_info
    def ConstantOfShape(self, node):
        val_shape = self.graph.get_input_node(node, idx=0, copy=True)
        val_y = self.graph.get_node(node.layer.output[0], copy=True)

        value = node.get_attr('value')
        dtype = value.dtype
        value = value.tolist()
        assert len(value) == 1, ('given value not Scalar, shape of value > 1, '
                                 'this is not supported')
        if len(value) == 1:
            value = value[0]
            layer_attrs = {
                'dtype': string(dtype),
                'fill_value': value
            }
            self.paddle_graph.add_layer(
                "paddle.full", 
                inputs={'shape': val_shape.name}, 
                outputs=[node.name],
                **layer_attrs)

    @print_mapping_info
    def Clip(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_y = self.graph.get_node(node.layer.output[0], copy=True)
        max_value, min_value = None, None
        if len(node.inputs) == 1:
            max_value = node.get_attr('max')
            min_value = node.get_attr('min')
            layer_attrs = {
                'max': max_value,
                'min': min_value,
            }
            
            self.paddle_graph.add_layer(
                'paddle.clip', 
                inputs={"x": val_x.name}, 
                outputs=[node.name], 
                **layer_attrs)
        else:
            min_ipt = self.graph.get_input_node(node, idx=1, copy=True)
            max_ipt = self.graph.get_input_node(node, idx=2, copy=True)
            min_value = _const_weight_or_none(min_ipt)
            max_value = _const_weight_or_none(max_ipt)
            if max_value.shape == (1, ):
                max_value = max_value[0]
            if min_value.shape == (1, ):
                min_value = min_value[0]
        if max_value is not None and min_value is not None:
            layer_attrs = {'max': max_value, 'min': min_value}
            self.paddle_graph.add_layer(
                'paddle.clip', 
                inputs={"x": val_x.name}, 
                outputs=[node.name], 
                **layer_attrs)
        else:
            raise

    @print_mapping_info
    def Split(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        paddle_op = 'split'
        split = node.get_attr('split')
        axis = node.get_attr('axis', 0)
        layer_attrs = {
            'num_or_sections': split,
            'axis': axis,
        }
        outputs_list = list()
        if isinstance(split, list) or isinstance(split, tuple):
            if len(split) == 1:
                outputs_list.append(node.name)
            else:
                for i in range(len(split)):
                    outputs_list.append("{}_p{}".format(node.layer_name, i))
        else:
            outputs_list.append(node.name)
        self.paddle_graph.add_layer(
            'paddle.split', 
            inputs={"x": val_x.name}, 
            outputs=outputs_list, 
            **layer_attrs)

    @print_mapping_info
    def Reshape(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_shape = self.graph.get_input_node(node, idx=1, copy=True)
        val_reshaped = self.graph.get_node(node.layer.output[0], copy=True)
        shape_value = _const_weight_or_none(val_shape)
        shape_dims = len(val_shape.out_shapes[0])

        if shape_value is not None:
            self.paddle_graph.add_layer(
                'paddle.reshape',
                inputs={'x': val_x.name},
                outputs=[node.name],
                shape=shape_value.tolist())
        elif len(node.out_shapes[0]) > 0 and _is_static_shape(node.out_shapes[
                0]):
            self.paddle_graph.add_layer(
                'paddle.reshape',
                inputs={'x': val_x.name},
                outputs=[node.name],
                shape=node.out_shapes[0])
        else:
            # shape may be [], come form Gather by scalar indices
            if len(val_shape.out_shapes[0]) > 0:
                self.paddle_graph.add_layer(
                    'paddle.reshape',
                    inputs={'x': val_shape.name},
                    outputs=[val_shape.name],
                    shape=val_shape.out_shapes[0])
            if val_shape.dtype != "int32":
                self.paddle_graph.add_layer(
                    'paddle.cast',
                    inputs={'x': val_shape.name},
                    outputs=[val_shape.name],
                    dtype=string("int32"))
            self.paddle_graph.add_layer(
                'paddle.reshape',
                inputs={'x': val_x.name,
                        'shape': val_shape.name},
                outputs=[node.name])

    @print_mapping_info
    def Cast(self, node):
        val_input = self.graph.get_input_node(node, idx=0, copy=True)
        val_output = self.graph.get_node(node.layer.output[0], copy=True)

        dtype = node.get_attr('to')
        if not isinstance(dtype, np.dtype):
            dtype = TENSOR_TYPE_TO_NP_TYPE[dtype]

        output_dtype = val_output.dtype
        if output_dtype:
            assert dtype == output_dtype, 'dtype of to unmatches output'
        self.paddle_graph.add_layer(
            'paddle.cast', 
            inputs={'x': val_input.name}, 
            outputs=[node.name], 
            dtype=string(dtype))

    @print_mapping_info
    def Not(self, node):
        val_input = self.graph.get_input_node(node, idx=0, copy=True)
        self.paddle_graph.add_layer('paddle.logical_not', 
                                    inputs={'x': val_input.name}, 
                                    outputs=[node.name])

    @print_mapping_info
    def AveragePool(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)

        auto_pad = node.get_attr('auto_pad', 'NOTSET')
        kernel_shape = node.get_attr("kernel_shape")
        poolnd = len(kernel_shape)
        strides = node.get_attr("strides")
        pad_mode = node.get_attr("pads")
        ceil_mode = bool(node.get_attr('ceil_mode', 0))
        pads = node.get_attr('pads', [0] * (poolnd * 2))

        paddings, val_x = self._pad_if_asymmetric(node, pads, val_x)

        if auto_pad == "SAME_UPPER" or auto_pad == "SAME_LOWER":
            input_shape = val_x.out_shapes[0]
            pad_h = _get_same_padding(input_shape[2], kernel_shape[0],
                                      strides[0])
            pad_w = _get_same_padding(input_shape[3], kernel_shape[1],
                                      strides[1])
            paddings = pad_h + pad_w

        op_name = name_generator("pool", self.nn_name2id)
        output_name = node.name
        layer_outputs = [op_name, output_name]
        paddle_op = 'paddle.nn.AvgPool{}D'.format(poolnd)
        assert 1 <= poolnd <= 3, 'only Pool1D, Pool2D and Pool3D are supported'
        layer_attrs = {
            "kernel_size": kernel_shape,
            "stride": strides,
            "padding": paddings,
            "ceil_mode": ceil_mode,
            "exclusive": 'True',
        }
        self.paddle_graph.add_layer(
            paddle_op, 
            inputs={'x': val_x if isinstance(val_x, str) else val_x.name}, 
            outputs=layer_outputs, 
            **layer_attrs)

    @print_mapping_info
    def Concat(self, node):
        inputs_list = []
        dtypes = set()
        for i in range(len(node.layer.input)):
            ipt = self.graph.get_input_node(node, idx=i, copy=True)
            inputs_list.append(ipt.name)
            dtypes.add(ipt.dtype)
        if len(dtypes) > 1:
            assert 'Unspported situation happened, please create issue on https://github.com/PaddlePaddle/X2Paddle/issues.'
        axis = node.get_attr('axis')
        self.paddle_graph.add_layer(
            'paddle.concat', 
            inputs={"x": inputs_list}, 
            outputs=[node.name], 
            axis=axis)

    @print_mapping_info
    def Flatten(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        output_shape = node.out_shapes[0]
        axis = node.get_attr('axis', 1)
        shape_list = [1, 1]
        if axis == 0:
            for s in output_shape:
                shape_list[1] *= s
        else:
            for s in output_shape[:axis]:
                shape_list[0] *= s
            for s in output_shape[axis:]:
                shape_list[1] *= s
        self.paddle_graph.add_layer(
            'paddle.reshape', 
            inputs={"x": val_x.name}, 
            outputs=[node.name],
            shape=shape_list)

    @print_mapping_info
    def Gemm(self, node):
        val_a = self.graph.get_input_node(node, idx=0, copy=True)
        val_b = self.graph.get_input_node(node, idx=1, copy=True)
        val_c = self.graph.get_input_node(node, idx=2, copy=True)

        alpha = node.get_attr('alpha', 1.)  # optional
        beta = node.get_attr('beta', 1.)  # optional
        trans_a = bool(node.get_attr('transA', 0))  # optional
        trans_b = bool(node.get_attr('transB', 0))  # optional
        val_mm = node.name + '_mm'
        matmul_inputs = {"x": val_a.name, 
                         "y": val_b.name}
        attr_matmul = {
            "transpose_x": trans_a,
            "transpose_y": trans_b,
        }
        self.paddle_graph.add_layer(
            'paddle.matmul',
            inputs=matmul_inputs,
            outputs=[val_mm],
            **attr_matmul)
        self.paddle_graph.add_layer(
            "paddle.scale", 
            inputs={"x": val_mm}, 
            outputs=[val_mm],
            scale=alpha)

        if beta != 0:
            if beta == 1.:
                add_inputs = {"x": val_mm, 
                              "y": val_c.name}
                self.paddle_graph.add_layer(
                    "paddle.add",
                    inputs=add_inputs,
                    outputs=[node.name])
            else:
                var_beta = node.name + '_beta'
                self.paddle_graph.add_layer(
                    "paddle.scale",
                    inputs={"x": val_c.name},
                    outputs=[var_beta],
                    scale=beta)
                add_inputs = {"x": val_mm, "y": var_beta}
                self.paddle_graph.add_layer(
                    "paddle.add",
                    inputs=add_inputs,
                    outputs=[node.name])

    @print_mapping_info
    def Sum(self, node):
        val_inps = node.layer.input
        inputs_dict = {
            "x": self.graph.get_input_node(
                node, idx=0, copy=True).name,
            "y": self.graph.get_input_node(
                node, idx=1, copy=True).name,
        }
        self.paddle_graph.add_layer("paddle.add", 
                                    inputs=inputs_dict, 
                                    outputs=[node.name])

        for idx, ipt in enumerate(val_inps[2:]):
            y = self.graph.get_input_node(node, idx=idx, copy=True)
            inputs_dict = {
                "x": node.name,
                "y": y.name,
            }
            self.paddle_graph.add_layer(
                "paddle.add", 
                inputs=inputs_dict, 
                outputs=[node.name])

    @print_mapping_info
    def MatMul(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_y = self.graph.get_input_node(node, idx=1, copy=True)
        x_shape = val_x.out_shapes[0]
        y_shape = val_y.out_shapes[0]
        inputs_dict = {"x": val_x.name, 
                       "y": val_y.name}
        if y_shape[0] == 1 and x_shape[-1] != 1 and x_shape[0] != 1:
            y_squeeze = val_y.name + '_squeeze'
            self.paddle_graph.add_layer(
                "paddle.squeeze",
                inputs={"x": val_y.name},
                outputs=[y_squeeze],
                axis=[0])
            inputs_dict['y'] = y_squeeze
            self.paddle_graph.add_layer(
                "paddle.matmul", 
                inputs=inputs_dict, 
                outputs=[node.name])
        else:
            self.paddle_graph.add_layer(
                "paddle.matmul", 
                inputs=inputs_dict, 
                outputs=[node.name])

    @print_mapping_info
    def BatchNormalization(self, node):
        op_name = name_generator("batchnorm", self.nn_name2id)
        output_name = node.name
        layer_outputs = [op_name, output_name]
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_scale = self.graph.get_input_node(node, idx=1, copy=True)
        val_b = self.graph.get_input_node(node, idx=2, copy=True)
        val_mean = self.graph.get_input_node(node, idx=3, copy=True)
        val_var = self.graph.get_input_node(node, idx=4, copy=True)

        momentum = node.get_attr('momentum', .9)
        epsilon = node.get_attr('epsilon', 1e-5)
        c = val_x.out_shapes[0][1]

        _rename_or_remove_weight(self.weights, val_scale.name, op_name+'.weight')
        _rename_or_remove_weight(self.weights, val_b.name, op_name+'.bias')
        _rename_or_remove_weight(self.weights, val_var.name, op_name+'._variance')
        _rename_or_remove_weight(self.weights, val_mean.name, op_name+'._mean')

        # Attribute: spatial is used in BatchNormalization-1,6,7
        spatial = bool(node.get_attr('spatial'))
        layer_attrs = {
            "num_channels": c,
            "momentum": momentum,
            "epsilon": epsilon,
            "is_test": True,
            "use_global_stats": False,
        }
        self.paddle_graph.add_layer(
            "paddle.nn.BatchNorm", 
            inputs={"x": val_x.name}, 
            outputs=layer_outputs, 
            **layer_attrs)

    @print_mapping_info
    def Transpose(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        s_len = len(val_x.out_shapes[0])
        perm_default = list(range(s_len))
        perm_default.reverse()
        perm = node.get_attr('perm', perm_default)
        self.paddle_graph.add_layer(
            "paddle.transpose", 
            inputs={"x": val_x.name},
            outputs=[node.name], 
            perm=perm)

    @print_mapping_info
    def PRelu(self, node):
        op_name = name_generator("prelu", self.nn_name2id)
        output_name = node.name
        layer_outputs = [op_name, output_name]
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_slope = self.graph.get_input_node(node, idx=1, copy=True)

        mode = 'channel'
        shape_slope = val_slope.out_shapes[0]
        if shape_slope == [1] * len(shape_slope):
            mode = 'all'

        if mode == "element":
            self.paddle_graph.add_layer(
                "paddle.zeros",
                inputs={}, 
                outputs=[output_name + "__zeros"], 
                shape=shape_slope,
                dtype=string(node.dtype))
            self.paddle_graph.add_layer(
                "paddle.maximum",
                inputs={"x": val_x.name, 
                        "y": output_name + "__zeros"}, 
                outputs=[output_name + "__max"])
            self.paddle_graph.add_layer(
                "paddle.minimum",
                inputs={"x": val_x.name, 
                        "y": output_name + "__zeros"}, 
                outputs=[output_name + "__max"])
            self.paddle_graph.add_layer(
                "paddle.multiply",
                inputs={"x": val_slope.name, 
                        "y": output_name + "__min"}, 
                outputs=[output_name + "__mul"])
            self.paddle_graph.add_layer(
                "paddle.add",
                inputs={"x": output_name + "__max", 
                        "y": output_name + "__mul"}, 
                outputs=[output_name])
        else:
            if mode == 'channel':
                slope_data = _const_weight_or_none(val_slope)
                if slope_data is None:
                    self.paddle_graph.add_layer(
                        "paddle.reshape", 
                        inputs={"x": val_slope.name}, 
                        outputs=[val_slope.name],
                        shape=[shape_slope[0]])
                    self.paddle_graph.add_layer(
                        "paddle.nn.functional.prelu", 
                        inputs={"x": val_x.name,
                                "weight": val_slope.name}, 
                        outputs=[node.name])
                    return
                _rename_or_remove_weight(self.weights, val_slope.name)
                if len(shape_slope) > 1:
                    self.weights[op_name+'._weight'] = np.reshape(slope_data, shape_slope[0])
                num_parameters = val_x.out_shapes[0][1]
            else:
                num_parameters = 1
                _rename_or_remove_weight(self.weights, val_slope.name)
                self.weights[op_name+'._weight'] = np.reshape(self.weights[val_slope.name], [1])
            self.paddle_graph.add_layer(
                "paddle.nn.PReLU", 
                inputs={"x": val_x.name}, 
                outputs=layer_outputs, 
                num_parameters=num_parameters)

    @print_mapping_info
    def Squeeze(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        axes = node.get_attr('axes')
        if len(val_x.out_shapes[0]) == 1:
            self.paddle_graph.add_layer(
                "paddle.cast",
                inputs={"x": val_x.name},
                outputs=[node.name],
                dtype=string(val_x.dtype))
        else:
            self.paddle_graph.add_layer(
                "paddle.squeeze", 
                inputs={"x": val_x.name}, 
                outputs=[node.name], 
                axis=axes)

    @print_mapping_info
    def Equal(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_y = self.graph.get_input_node(node, idx=1, copy=True)
        self.paddle_graph.add_layer(
            "paddle.equal",
            inputs={'x': val_x.name,
                    'y': val_y.name},
            outputs=[node.name])

    @print_mapping_info
    def Greater(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_y = self.graph.get_input_node(node, idx=1, copy=True)
        self.paddle_graph.add_layer(
            "paddle.greater_than",
            inputs={'x': val_x.name,
                    'y': val_y.name},
            outputs=[node.name],
            param_attr=None)

    @print_mapping_info
    def Where(self, node):
        condition = self.graph.get_input_node(node, idx=0, copy=True)
        val_x = self.graph.get_input_node(node, idx=1, copy=True)
        val_y = self.graph.get_input_node(node, idx=2, copy=True)

        not_condition = condition.name + '_not'
        self.paddle_graph.add_layer(
            "paddle.logical_not",
            inputs={"x": condition.name},
            outputs=[not_condition])
        cast_not_condition = not_condition + '_cast'
        self.paddle_graph.add_layer(
            "paddle.cast",
            inputs={"x": not_condition},
            outputs=[cast_not_condition],
            dtype=string(val_x.dtype))
        cast_condition = condition.name + '_cast'
        self.paddle_graph.add_layer(
            "paddle.cast",
            inputs={"x": condition.name},
            outputs=[cast_condition],
            dtype=string(val_x.dtype))
        mul_val_x = val_x.name + '_mul'
        self.paddle_graph.add_layer(
            "paddle.multiply",
            inputs={'x': val_x.name,
                    'y': cast_condition},
            outputs=[mul_val_x])
        mul_val_y = val_y.name + '_mul'
        self.paddle_graph.add_layer(
            "paddle.multiply",
            inputs={'x': val_y.name,
                    'y': cast_not_condition},
            outputs=[mul_val_y])

        self.paddle_graph.add_layer(
            "paddle.add",
            inputs={'x': mul_val_x,
                    'y': mul_val_y},
            outputs=[node.name])

    @print_mapping_info
    def NonZero(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_x_dim = len(val_x.out_shapes[0])
        if val_x_dim == 1:
            self.paddle_graph.add_layer(
                "paddle.nonzero", 
                inputs={"x": val_x.name}, 
                outputs=[val_x.name])
            self.paddle_graph.add_layer(
                "paddle.transpose",
                inputs={"x": val_x.name},
                outputs=[node.layer_name],
                perm=[1, 0])
        if val_x_dim > 1:
            self.paddle_graph.add_layer(
                "paddle.nonzero", 
                inputs={"x": val_x.name}, 
                outputs=[val_x.name])
            self.paddle_graph.add_layer(
                "paddle.split",
                inputs={"x": val_x.name}, 
                outputs=[val_x.name],
                num_or_sections=1,
                axis=val_x_dim)
            self.paddle_graph.add_layer(
                "paddle.concat", 
                inputs={"x": val_x.name}, 
                outputs=[node.name])

    @print_mapping_info
    def Identity(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        self.paddle_graph.add_layer(
            "paddle.assign", 
            inputs={"x": val_x.name}, 
            outputs=[node.name])

    @print_mapping_info
    def Tile(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_repeats = self.graph.get_input_node(node, idx=1, copy=True)
        repeats = _const_weight_or_none(val_repeats)

        if repeats is None:
            repeats = val_repeats.name
            if val_repeats.dtype != 'int32':
                self.paddle_graph.add_layer(
                    "paddle.cast",
                    inputs={"x": repeats},
                    outputs=["{}.tmp".format(repeats)],
                    dtype=string("int32"))
                repeats = "{}.tmp".format(repeats)

        elif isinstance(repeats, int):
            repeats = [repeats]

        attr = {
            'expand_times': repeats,
            "name": string(node.name),
        }
        self.paddle_graph.add_layer(
            "paddle.tile", 
            inputs={"x": val_x.name}, 
                    outputs=[node.name], 
                    repeat_times=repeats)

    @print_mapping_info
    def MaxPool(self, node):
        op_name = name_generator("pool", self.nn_name2id)
        output_name = node.name
        layer_outputs = [op_name, output_name]
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        auto_pad = node.get_attr('auto_pad', 'NOTSET')
        assert node.get_attr(
            "dilations") is None, 'only dilations = 0 is supported'  # optional

        kernel_shape = node.get_attr("kernel_shape")
        poolnd = len(kernel_shape)
        strides = node.get_attr("strides")
        pad_mode = node.get_attr("pads")
        ceil_mode = bool(node.get_attr('ceil_mode', 0))  # optional
        pads = node.get_attr('pads', [0] * (poolnd * 2))  # optional
        paddle_op = 'paddle.nn.MaxPool{}D'.format(poolnd)
        assert 1 <= poolnd <= 3, 'only Pool1D, Pool2D and Pool3D are supported'

        paddings, val_x = self._pad_if_asymmetric(node, pads, val_x)

        if auto_pad == "SAME_UPPER" or auto_pad == "SAME_LOWER":
            input_shape = val_x.out_shapes[0]
            pad_h = _get_same_padding(input_shape[2], kernel_shape[0],
                                      strides[0])
            pad_w = _get_same_padding(input_shape[3], kernel_shape[1],
                                      strides[1])
            paddings = pad_h + pad_w
            
        layer_attrs = {
            "kernel_size": kernel_shape,
            "stride": strides,
            "padding": paddings,
            "ceil_mode": ceil_mode,
        }
        self.paddle_graph.add_layer(
            paddle_op, 
            inputs={'x': val_x if isinstance(val_x, str) else val_x.name}, 
            outputs=layer_outputs, 
            **layer_attrs)

    @print_mapping_info
    def GlobalMaxPool(self, node):
        op_name = name_generator("pool", self.nn_name2id)
        output_name = node.name
        layer_outputs = [op_name, output_name]
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        input_shape = val_x.out_shapes[0]
        if len(input_shape) == 4:
            poolnd = 2
        elif len(input_shape) == 5:
            poolnd = 3
        elif len(input_shape) == 3:
            poolnd = 1
        paddle_op = 'paddle.nn.AdaptiveMaxPool{}D'.format(poolnd)
        assert 1 <= poolnd <= 3, 'only Pool1D, Pool2D and Pool3D are supported'
        output_shape = node.out_shapes[0]
        self.paddle_graph.add_layer(
            paddle_op, 
            inputs={'x': val_x.name}, 
            outputs=layer_outputs, 
            output_size=output_shape[2:])

    @print_mapping_info
    def GlobalAveragePool(self, node):
        op_name = name_generator("pool", self.nn_name2id)
        output_name = node.name
        layer_outputs = [op_name, output_name]
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        input_shape = val_x.out_shapes[0]
        if len(input_shape) == 4:
            poolnd = 2
        elif len(input_shape) == 5:
            poolnd = 3
        elif len(input_shape) == 3:
            poolnd = 1
        paddle_op = 'paddle.nn.AdaptiveAvgPool{}D'.format(poolnd)
        assert 1 <= poolnd <= 3, 'only Pool1D, Pool2D and Pool3D are supported'
        output_shape = node.out_shapes[0]
        self.paddle_graph.add_layer(
            paddle_op, 
            inputs={'x': val_x.name}, 
            outputs=layer_outputs, 
            output_size=output_shape[2:])

    @print_mapping_info
    def Conv(self, node):
        op_name = name_generator("conv", self.nn_name2id)
        output_name = node.name
        layer_outputs = [op_name, output_name]
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_w = self.graph.get_input_node(node, idx=1, copy=True)
        has_bias = len(node.layer.input) == 3
        if has_bias:
            val_b = self.graph.get_input_node(node, idx=2, copy=True)
        auto_pad = node.get_attr('auto_pad', 'NOTSET')

        kernel_shape = node.get_attr('kernel_shape')
        convnd = len(kernel_shape)
        assert 2 <= convnd <= 3, 'only Conv2D and Conv3D is supported'
        num_out_channels = val_w.out_shapes[0][0]
        num_in_channels = val_w.out_shapes[0][1]
        paddle_op = 'paddle.nn.Conv{}D'.format(convnd)

        num_groups = node.get_attr('group', 1)
        strides = node.get_attr('strides', [1] * convnd)
        dilations = node.get_attr('dilations', [1] * convnd)
        pads = node.get_attr('pads', [0] * (convnd * 2))

        input_shape = val_x.out_shapes[0]
        paddings, val_x = self._pad_if_asymmetric(node, pads, val_x)

        if auto_pad == "SAME_UPPER" or auto_pad == "SAME_LOWER":
            pad_h = _get_same_padding(input_shape[2], kernel_shape[0],
                                      strides[0])
            pad_w = _get_same_padding(input_shape[3], kernel_shape[1],
                                      strides[1])
            paddings = pad_h + pad_w

        layer_inputs = {'x': val_x if isinstance(val_x, str) else val_x.name}
        layer_attrs = {
            "in_channels": num_in_channels * num_groups,
            "out_channels": num_out_channels,
            "kernel_size": kernel_shape,
            "stride": strides,
            "padding": paddings,
            "dilation": dilations,
            "groups": num_groups,
        }
        remove_weight = True if  val_w.name in self.done_weight_list else False
        if remove_weight:
            self.done_weight_list.append(val_w.name)
        _rename_or_remove_weight(self.weights, val_w.name, op_name+'.weight', remove_weight)
        if has_bias:
            remove_bias = True if val_b.name in self.done_weight_list else False
            if remove_bias:
                self.done_weight_list.append(val_b_name)
            _rename_or_remove_weight(self.weights, val_b.name, op_name+'.bias', remove_bias)
        else:
            layer_attrs["bias_attr"] = False
        if reduce(lambda x,y:x*y, input_shape) in [1, -1] and 1 not in input_shape:
            input_shape[1] = num_in_channels * num_groups
            input_shape[0] = 0
            input_shape[2] = 0
            self.paddle_graph.add_layer(
                "paddle.reshape", 
                inputs=layer_inputs, 
                outputs=[layer_inputs["x"]], 
                shape=input_shape)
        self.paddle_graph.add_layer(
            paddle_op, 
            inputs=layer_inputs, 
            outputs=layer_outputs, 
            **layer_attrs)

    @print_mapping_info
    def ConvTranspose(self, node):
        op_name = name_generator("conv_trans", self.nn_name2id)
        output_name = node.name
        layer_outputs = [op_name, output_name]
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_w = self.graph.get_input_node(node, idx=1, copy=True)
        val_b = None
        if len(node.layer.input) > 2:
            val_b = self.graph.get_input_node(node, idx=2, copy=True)
        auto_pad = node.get_attr('auto_pad', 'NOTSET')
        out_padding = node.get_attr('output_padding', [0, 0])
        kernel_shape = node.get_attr('kernel_shape')
        assert kernel_shape, 'kernel_shape not inferred'
        convnd = len(kernel_shape)
        assert 2 <= convnd <= 3, 'only Conv2DTranspose and Conv3DTranspose supported'
        num_in_channels = val_w.out_shapes[0][0]
        num_out_channels = val_w.out_shapes[0][1]
        paddle_op = 'paddle.nn.Conv{}DTranspose'.format(convnd)

        num_groups = node.get_attr('group', 1)
        strides = node.get_attr('strides', [1] * convnd)
        dilations = node.get_attr('dilations', [1] * convnd)
        output_size = node.get_attr('output_shape', [])
        pads = node.get_attr('pads', [0] * (convnd * 2))

        paddings, var_x = self._pad_if_asymmetric(node, pads, val_x)

        output_size = [0, 0]

        output_size[0] = (val_x.out_shapes[0][2] - 1
                          ) * strides[0] - 2 * paddings[0] + dilations[0] * (
                              kernel_shape[0] - 1) + 1 + out_padding[0]
        output_size[1] = (val_x.out_shapes[0][3] - 1
                          ) * strides[1] - 2 * paddings[1] + dilations[1] * (
                              kernel_shape[1] - 1) + 1 + out_padding[1]

        # Conv2DTranspose缺少output_size，只能在forward里头传进output_size
        inputs_dict = {'x': val_x if isinstance(val_x, str) else val_x.name}
        layer_attrs = {
            "in_channels": num_in_channels,
            "out_channels": num_out_channels,
            "kernel_size": kernel_shape,
            "stride": strides,
            "dilation": dilations,
            "padding": paddings,
            "groups": num_groups,
            "output_padding":out_padding}
            
        _rename_or_remove_weight(self.weights, val_w.name, op_name+'.weight',)
        if val_b is not None:
            _rename_or_remove_weight(self.weights, val_b.name, op_name+'.bias')
        self.paddle_graph.add_layer(
            kernel=paddle_op,
            inputs=inputs_dict,
            outputs=layer_outputs,
            **layer_attrs)
        
    @print_mapping_info
    def ArgMax(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        axis = node.get_attr('axis')
        keepdims = False if node.get_attr('keepdims') == 0 else True
        layer_attrs = {'axis': axis,
                      'keepdim': keepdims}
        self.paddle_graph.add_layer(
            'paddle.argmax', 
            inputs={"x": val_x.name}, 
            outputs=[node.name],
            **layer_attrs)

        
    @print_mapping_info
    def Size(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        self.paddle_graph.add_layer(
            "paddle.shape", 
            inputs={"input": val_x.name}, 
            outputs=[node.name])
        self.paddle_graph.add_layer(
            'paddle.cast',
            inputs={"x": node.name},
            outputs=[node.name],
            dtype=string('int64'))  
        self.paddle_graph.add_layer(
            "paddle.prod",
            inputs={"x": node.name},
            outputs=[node.name])
        
    @print_mapping_info
    def Sign(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        if node.dtype not in ["float16", "float32", "float64"]:
            self.paddle_graph.add_layer(
                "paddle.cast", 
                inputs={"x": val_x.name}, 
                outputs=[val_x.name],
                dtype=string("float32"))
        self.paddle_graph.add_layer(
            "paddle.sign", 
            inputs={"x": val_x.name}, 
            outputs=[node.name])
        if node.dtype not in ["float16", "float32", "float64"]:
            self.paddle_graph.add_layer(
                "paddle.cast", 
                inputs={"x": node.name}, 
                outputs=[node.name],
                dtype=string(node.dtype))
        
    @print_mapping_info
    def OneHot(self, node):
        nn_op_name = name_generator("onehot", self.nn_name2id)
        output_name = node.name
        layer_outputs = [nn_op_name, output_name]
        indices = self.graph.get_input_node(node, idx=0, copy=True)
        depth = self.graph.get_input_node(node, idx=1, copy=True)
        values = self.graph.get_input_node(node, idx=2, copy=True)
        axis = node.get_attr('axis', -1)
        self.paddle_graph.add_layer(
            "custom_layer:OneHot", 
            inputs={"indices": indices.name,
                    "depth": depth.name,
                    "values": values.name}, 
            outputs=layer_outputs,
            axis=axis)
    
    @print_mapping_info
    def Reciprocal(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        self.paddle_graph.add_layer(
            "paddle.reciprocal", 
            inputs={"x": val_x.name}, 
            outputs=[node.name])

    @print_mapping_info
    def LSTM(self, node):
        x = self.graph.get_input_node(node, idx=0, copy=True)
        input_weight = self.graph.get_input_node(node, idx=1, copy=True)
        hidden_weight = self.graph.get_input_node(node, idx=2, copy=True)

        input_nums = len(node.layer.input)
        exist_input_nums = 3
        have_bias = False
        if input_nums > 3 and node.layer.input[3] != '':
            bias = self.graph.get_input_node(node, idx=exist_input_nums, copy=True)
            have_bias = True
            exist_input_nums += 1
        if input_nums > 4 and node.layer.input[4] != '':
            sequence_lens = self.graph.get_input_node(node, idx=exist_input_nums, copy=True)
            exist_input_nums += 1
        if input_nums > 5 and node.layer.input[5] != '':
            init_h = self.graph.get_input_node(node, idx=exist_input_nums, copy=True)
            self.paddle_graph.add_layer(
                'paddle.reshape',
                inputs={"x": init_h.name},
                outputs=[init_h.name],
                shape=init_h.out_shapes[0]
                )
            exist_input_nums += 1
        if input_nums > 6 and node.layer.input[6] != '':
            init_c = self.graph.get_input_node(node, idx=exist_input_nums, copy=True)
            self.paddle_graph.add_layer(
                'paddle.reshape',
                inputs={"x": init_c.name},
                outputs=[init_c.name],
                shape=init_c.out_shapes[0]
                )

        input_weight_np = _const_weight_or_none(input_weight)
        _rename_or_remove_weight(self.weights, input_weight.name)
        hidden_size = node.get_attr('hidden_size', input_weight_np.shape[1]/4)
        input_size = input_weight_np.shape[2]
        hidden_weight_np = _const_weight_or_none(hidden_weight)
        _rename_or_remove_weight(self.weights, hidden_weight.name)
        bias_np = _const_weight_or_none(bias)
        _rename_or_remove_weight(self.weights, bias.name)
        input_bias_np = bias_np[:, :4*hidden_size]
        hidden_bias_np = bias_np[:, 4*hidden_size:]

        # parameters order in paddle:lstm:
        # 1. gate order in paddle is: input, forget, cell, output.
        # 2. gate orfer in onnx is: input, output, forget, cell.

        def reform_weights(w, n, intervals):
            slices = [w[:,x * n: y * n] for x, y in intervals]
            return np.concatenate(slices, axis=1)

        def transform_weight_with_bias(weights, n, intervals):
            return [reform_weights(w, n, intervals) for w in weights]

        reform_permutation = [(0, 1), (2, 4), (1, 2)]

        weights = transform_weight_with_bias(
            [input_weight_np, hidden_weight_np, input_bias_np, hidden_bias_np],
            hidden_size, reform_permutation)

        op_name = name_generator("lstm", self.nn_name2id)
        y_out = node.output(0)
        yh_out = node.output(1) 
        yc_out = node.output(2)
        direction = node.get_attr('direction', 'forward')

        def generate_paddle_param_names(op_name, suffix=''):
            param_names = []
            param_names.extend(['{}.weight_ih_l0{}', '{}.weight_hh_l0{}'])
            if have_bias != False: param_names.append('{}.bias_ih_l0{}')
            if have_bias != False: param_names.append('{}.bias_hh_l0{}')
            param_names = [x.format(op_name, suffix) for x in param_names]
            return param_names

        def assign_params(op_name, weights, weight_idx=0, suffix=''):
            param_names = generate_paddle_param_names(op_name, suffix)
            print(param_names)
            for param_name, weight in zip(param_names, weights):
                self.weights[param_name] = weight[weight_idx]

        if direction == 'backward':
            raise Exception("LSTM support 'forward' or 'bidirectional', except '{}'.".format(direction))
        else:
            assign_params(op_name, weights)
            if direction == 'bidirectional':
                assign_params(op_name, weights, 1, '_reverse')

        self.paddle_graph.add_layer(
            'paddle.nn.LSTM', 
            inputs={'input': x.name, 'initial_states': (init_h.name, init_c.name)},
            outputs=[op_name, y_out, yh_out, yc_out],
            input_size=input_size,
            hidden_size=hidden_size,
            num_layers=1,
            direction=string(direction),
            time_major=True)

        self.paddle_graph.add_layer(
            'paddle.reshape',
            inputs={"x": y_out},
            outputs=[y_out],
            shape=[0, 0, -1, hidden_size]
            )
        self.paddle_graph.add_layer(
            'paddle.transpose',
            inputs={"x": y_out},
            outputs=[y_out],
            perm=[0,2,1,3]
            )
        
    @print_mapping_info
    def TopK(self, node):
        val_x = self.graph.get_input_node(node, idx=0, copy=True)
        val_k = self.graph.get_input_node(node, idx=1, copy=True)
        layer_attrs = dict()
        layer_attrs["axis"] = node.get_attr('axis', -1)
        layer_attrs["largest"] = True if node.get_attr('largest', 1) == 1 else False
        layer_attrs["sorted"] = True if node.get_attr('sorted', 1) == 1 else False
        self.paddle_graph.add_layer(
            "paddle.topk", 
            inputs={"x": val_x.name,
                    "k": val_k.name}, 
            outputs=["{}_p{}".format(node.layer_name, 0), "{}_p{}".format(node.layer_name, 1)],
            **layer_attrs)