Merge https://github.com/PaddlePaddle/PaddleFL into new_version

CMakeLists.txt

-cmake_minimum_required(VERSION 3.13)
+cmake_minimum_required(VERSION 3.15)
 
 project(PaddleEncrypted)
 

README.md

@@ -19,7 +19,7 @@ In PaddleFL, horizontal and vertical federated learning strategies will be imple
 
 - **Vertical Federated Learning**: Logistic Regression with PrivC, Neural Network with third-party PrivC [5]
 
-- **Horizontal Federated Learning**: Federated Averaging [2], Differential Privacy [6]
+- **Horizontal Federated Learning**: Federated Averaging [2], Differential Privacy [6], Secure Aggregation
 
 #### Training Strategy
 
@@ -38,7 +38,7 @@ In PaddleFL, components for defining a federated learning task and training a fe
 
 #### Compile Time
 
-- **FL-Strategy**: a user can define federated learning strategies with FL-Strategy such as Fed-Avg[1]
+- **FL-Strategy**: a user can define federated learning strategies with FL-Strategy such as Fed-Avg[2]
 
 - **User-Defined-Program**: PaddlePaddle's program that defines the machine learning model structure and training strategies such as multi-task learning.
 

README_cn.md

@@ -16,7 +16,7 @@ PaddleFL是一个基于PaddlePaddle的开源联邦学习框架。研究人员可
 
 - **纵向联邦学习**: 带privc的逻辑回归，带第三方privc的神经网络[5]
 
-- **横向联邦学习**: 联邦平均 [2]，差分隐私 [6]
+- **横向联邦学习**: 联邦平均 [2]，差分隐私 [6]，安全聚合
 
 #### 训练策略
 
@@ -35,7 +35,7 @@ PaddleFL是一个基于PaddlePaddle的开源联邦学习框架。研究人员可
 
 #### 编译时
 
-- **FL-Strategy**: 用户可以使用FL-Strategy定义联邦学习策略，例如Fed-Avg[1]。
+- **FL-Strategy**: 用户可以使用FL-Strategy定义联邦学习策略，例如Fed-Avg[2]。
 
 - **User-Defined-Program**: PaddlePaddle的程序定义了机器学习模型结构和训练策略，如多任务学习。
 

cmake/third_party.cmake

@@ -172,7 +172,7 @@ if(WIN32 OR APPLE OR NOT WITH_GPU OR ON_INFER)
 endif()
 
 if(${CMAKE_VERSION} VERSION_GREATER "3.5.2")
-    set(SHALLOW_CLONE "GIT_SHALLOW TRUE") # adds --depth=1 arg to git clone of External_Projects
+    set(SHALLOW_CLONE GIT_SHALLOW TRUE) # adds --depth=1 arg to git clone of External_Projects
 endif()
 
 ########################### include third_party according to flags ###############################

core/paddlefl_mpc/mpc_protocol/aby3_operators.h

@@ -138,6 +138,16 @@ public:
     op_->relu(out_);
   }
 
+  void sigmoid(const Tensor *op, Tensor *out) override {
+    auto op_tuple = from_tensor(op);
+    auto out_tuple = from_tensor(out);
+
+    auto op_ = std::get<0>(op_tuple).get();
+    auto out_ = std::get<0>(out_tuple).get();
+
+    op_->sigmoid(out_);
+  }
+
   void softmax(const Tensor *op, Tensor *out) override {
     auto op_tuple = from_tensor(op);
     auto out_tuple = from_tensor(out);

core/paddlefl_mpc/mpc_protocol/mpc_operators.h

@@ -42,6 +42,8 @@ public:
 
   virtual void relu(const Tensor *op, Tensor *out) = 0;
 
+  virtual void sigmoid(const Tensor *op, Tensor *out) = 0;
+
   virtual void softmax(const Tensor *op, Tensor *out) = 0;
 
   virtual void gt(const Tensor *lhs, const Tensor *rhs, Tensor *out) = 0;

core/paddlefl_mpc/operators/mpc_sigmoid_cross_entropy_with_logits_op.cc

+/* Copyright (c) 2020 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. */
+
+#include <memory>
+#include <string>
+#include <vector>
+#include "paddle/fluid/framework/op_registry.h"
+#include "mpc_sigmoid_cross_entropy_with_logits_op.h"
+
+namespace paddle {
+namespace operators {
+
+using framework::Tensor;
+const int kIgnoreIndex = -100;
+
+class MpcSigmoidCrossEntropyWithLogitsOp : public framework::OperatorWithKernel {
+public:
+    using framework::OperatorWithKernel::OperatorWithKernel;
+
+    void InferShape(framework::InferShapeContext* ctx) const override {
+        PADDLE_ENFORCE(ctx->HasInput("X"), "Input(X) should be not null.");
+        PADDLE_ENFORCE(ctx->HasInput("Label"), "Input(Label) should be not null.");
+        PADDLE_ENFORCE(ctx->HasOutput("Out"), "Output(Out) should be not null.");
+
+        auto x_dims = ctx->GetInputDim("X");
+        auto labels_dims = ctx->GetInputDim("Label");
+
+        int rank = x_dims.size();
+        PADDLE_ENFORCE_EQ(rank, labels_dims.size(),
+                          "Input(X) and Input(Label) shall have the same rank.");
+        bool check = true;
+        if ((!ctx->IsRuntime()) && (framework::product(x_dims) <= 0 ||
+                                    framework::product(labels_dims) <= 0)) {
+            check = false;
+        }
+
+        if (check) {
+            PADDLE_ENFORCE_EQ(framework::slice_ddim(x_dims, 0, rank),
+                              framework::slice_ddim(labels_dims, 0, rank),
+                             "Input(X) and Input(Label) shall have the same shape "
+                             "except the last dimension.");
+        }
+
+        ctx->ShareDim("X", "Out");
+        ctx->ShareLoD("X", "Out");
+    }
+};
+
+class MpcSigmoidCrossEntropyWithLogitsGradOp : public framework::OperatorWithKernel {
+public:
+    using framework::OperatorWithKernel::OperatorWithKernel;
+
+    void InferShape(framework::InferShapeContext* ctx) const override {
+        PADDLE_ENFORCE(ctx->HasInput("X"), "Input(X) should be not null.");
+        PADDLE_ENFORCE(ctx->HasInput("Label"), "Input(Label) should be not null.");
+        PADDLE_ENFORCE(ctx->HasInput(framework::GradVarName("Out")),
+                       "Input(Out@GRAD) shoudl be not null.");
+        PADDLE_ENFORCE(ctx->HasOutput(framework::GradVarName("X")),
+                       "Output(X@GRAD) should be not null.");
+
+        auto x_dims = ctx->GetInputDim("X");
+        auto labels_dims = ctx->GetInputDim("Label");
+        auto dout_dims = ctx->GetInputDim(framework::GradVarName("Out"));
+
+        int rank = x_dims.size();
+        bool check = true;
+        if ((!ctx->IsRuntime()) && (framework::product(x_dims) <= 0 ||
+                                    framework::product(labels_dims) <= 0)) {
+            check = false;
+        }
+
+        if (check) {
+            PADDLE_ENFORCE_EQ(framework::slice_ddim(x_dims, 0, rank),
+                              framework::slice_ddim(labels_dims, 0, rank),
+                              "Input(X) and Input(Label) shall have the same shape.");
+
+            PADDLE_ENFORCE_EQ(framework::slice_ddim(x_dims, 0, rank),
+                              framework::slice_ddim(dout_dims, 0, rank),
+                              "Input(X) and Input(Out@Grad) shall have the same shape.");
+        }
+
+        ctx->SetOutputDim(framework::GradVarName("X"), x_dims);
+    }
+};
+
+class MpcSigmoidCrossEntropyWithLogitsOpMaker : public framework::OpProtoAndCheckerMaker {
+public:
+    void Make() override {
+        AddInput("X",
+                 "(Tensor, default Tensor<float>), a 2-D tensor with shape N x D, "
+                 "where N is the batch size and D is the number of classes. "
+                 "This input is a tensor of logits computed by the previous "
+                 " operator. Logits are unscaled log probabilities given as "
+                 "log(p/(1-p)).");
+        AddInput("Label",
+                 "(Tensor, default Tensor<float>), a 2-D tensor of the same type "
+                 "and shape as X. This input is a tensor of probabalistic labels "
+                 "for each logit");
+        AddOutput("Out",
+                  "(Tensor, default Tensor<float>), a 2-D tensor with shape N x D "
+                  " of elementwise logistic losses.");
+        AddComment(R"DOC(
+MpcSigmoidCrossEntropyWithLogits Operator.
+)DOC");
+    }
+};
+
+template <typename T>
+class MpcSigmoidCrossEntropyWithLogitsGradOpMaker : public framework::SingleGradOpDescMaker {
+public:
+    using framework::SingleGradOpDescMaker::SingleGradOpDescMaker;
+
+protected:
+    std::unique_ptr<T> Apply() const override {
+        std::unique_ptr<T> retv(new T());
+        retv->SetType("mpc_sigmoid_cross_entropy_with_logits_grad");
+        retv->SetInput("X", this->Input("X"));
+        retv->SetInput("Label", this->Input("Label"));
+        retv->SetInput("Out", this->Output("Out"));
+        retv->SetInput(framework::GradVarName("Out"), this->OutputGrad("Out"));
+        retv->SetOutput(framework::GradVarName("X"), this->InputGrad("X"));
+        retv->SetAttrMap(this->Attrs());
+        return retv;
+    }
+};
+
+DECLARE_INPLACE_OP_INFERER(MpcSigmoidCrossEntropyWithLogitsInplaceInferer,
+                           {"X", "Out"});
+DECLARE_INPLACE_OP_INFERER(MpcSigmoidCrossEntropyWithLogitsGradInplaceInferer,
+                           {framework::GradVarName("Out"),
+                            framework::GradVarName("X")});
+
+}  // namespace operators
+}  // namespace paddle
+
+namespace ops = paddle::operators;
+REGISTER_OPERATOR(
+    mpc_sigmoid_cross_entropy_with_logits, ops::MpcSigmoidCrossEntropyWithLogitsOp,
+    ops::MpcSigmoidCrossEntropyWithLogitsOpMaker,
+    ops::MpcSigmoidCrossEntropyWithLogitsGradOpMaker<paddle::framework::OpDesc>,
+    ops::MpcSigmoidCrossEntropyWithLogitsInplaceInferer);
+REGISTER_OPERATOR(mpc_sigmoid_cross_entropy_with_logits_grad,
+                  ops::MpcSigmoidCrossEntropyWithLogitsGradOp,
+                  ops::MpcSigmoidCrossEntropyWithLogitsGradInplaceInferer);
+REGISTER_OP_CPU_KERNEL(
+    mpc_sigmoid_cross_entropy_with_logits,
+    ops::MpcSigmoidCrossEntropyWithLogitsKernel<paddle::platform::CPUDeviceContext, int64_t>);
+REGISTER_OP_CPU_KERNEL(
+    mpc_sigmoid_cross_entropy_with_logits_grad,
+    ops::MpcSigmoidCrossEntropyWithLogitsGradKernel<paddle::platform::CPUDeviceContext, int64_t>);

core/paddlefl_mpc/operators/mpc_sigmoid_cross_entropy_with_logits_op.h

+/* Copyright (c) 2020 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. */
+
+#pragma once
+#include "mpc_op.h"
+
+namespace paddle {
+namespace operators {
+
+using Tensor = framework::Tensor;
+
+// Out = sigmoid(x) : prediction of x. 
+// todo: Out = max(X, 0) - X * Labels + log(1 + exp(-abs(X)))
+template <typename DeviceContext, typename T>
+class MpcSigmoidCrossEntropyWithLogitsKernel : public MpcOpKernel<T> {
+public:
+    void ComputeImpl(const framework::ExecutionContext &ctx) const override {
+        auto *in_x_t = ctx.Input<Tensor>("X");
+        auto *out_t = ctx.Output<Tensor>("Out");
+        out_t->mutable_data<T>(ctx.GetPlace());
+
+        mpc::MpcInstance::mpc_instance()->mpc_protocol()->mpc_operators()->sigmoid(in_x_t, out_t);
+    }
+};
+
+// dX = sigmoid(X) - labels
+template <typename DeviceContext, typename T>
+class MpcSigmoidCrossEntropyWithLogitsGradKernel : public MpcOpKernel<T> {
+public:
+    void ComputeImpl(const framework::ExecutionContext &ctx) const override {
+        auto *in_label_t = ctx.Input<Tensor>("Label");
+        auto *in_sigmoid_t = ctx.Input<Tensor>("Out");
+        auto dx = ctx.Output<Tensor>(framework::GradVarName("X"));
+
+        auto dx_data = dx->mutable_data<T>(ctx.GetPlace());
+
+        mpc::MpcInstance::mpc_instance()->mpc_protocol()->mpc_operators()->sub(in_sigmoid_t, in_label_t, dx);
+    }
+};
+
+}  // namespace operators
+}  // namespace paddle

python/paddle_fl/mpc/examples/mnist_demo/mnist_demo.py

+# coding=utf-8
+# Copyright (c) 2020 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.
+"""
+MNIST Demo
+"""
+
+import sys
+sys.path.append('../')
+
+import env_set
+import numpy as np
+import time
+
+import paddle
+import paddle.fluid as fluid
+import paddle_fl.mpc as pfl_mpc
+import paddle_fl.mpc.data_utils.aby3 as aby3
+import prepare_data
+
+role, server, port = env_set.TestOptions().values()
+# modify host(localhost).
+pfl_mpc.init("aby3", int(role), "localhost", server, int(port))
+role = int(role)
+
+# data preprocessing
+BATCH_SIZE = 128
+epoch_num = 2
+
+# network
+x = pfl_mpc.data(name='x', shape=[BATCH_SIZE, 784], dtype='int64')
+y = pfl_mpc.data(name='y', shape=[BATCH_SIZE, 1], dtype='int64')
+
+y_pre = pfl_mpc.layers.fc(input=x, size=1)
+cost = pfl_mpc.layers.sigmoid_cross_entropy_with_logits(y_pre, y)
+
+infer_program = fluid.default_main_program().clone(for_test=False)
+
+avg_loss = pfl_mpc.layers.mean(cost)
+optimizer = pfl_mpc.optimizer.SGD(learning_rate=0.001)
+optimizer.minimize(avg_loss)
+
+# train_reader
+feature_reader = aby3.load_aby3_shares("/tmp/mnist2_feature", id=role, shape=(784,))
+label_reader = aby3.load_aby3_shares("/tmp/mnist2_label", id=role, shape=(1,))
+batch_feature = aby3.batch(feature_reader, BATCH_SIZE, drop_last=True)
+batch_label = aby3.batch(label_reader, BATCH_SIZE, drop_last=True)
+
+# test_reader
+test_feature_reader = aby3.load_aby3_shares("/tmp/mnist2_test_feature", id=role, shape=(784,))
+test_label_reader = aby3.load_aby3_shares("/tmp/mnist2_test_label", id=role, shape=(1,))
+test_batch_feature = aby3.batch(test_feature_reader, BATCH_SIZE, drop_last=True)
+test_batch_label = aby3.batch(test_label_reader, BATCH_SIZE, drop_last=True)
+
+place = fluid.CPUPlace()
+
+# async data loader
+loader = fluid.io.DataLoader.from_generator(feed_list=[x, y], capacity=BATCH_SIZE)
+batch_sample = paddle.reader.compose(batch_feature, batch_label)
+loader.set_batch_generator(batch_sample, places=place)
+
+test_loader = fluid.io.DataLoader.from_generator(feed_list=[x, y], capacity=BATCH_SIZE)
+test_batch_sample = paddle.reader.compose(test_batch_feature, test_batch_label)
+test_loader.set_batch_generator(test_batch_sample, places=place)
+
+# loss file
+loss_file = "/tmp/mnist_output_loss.part{}".format(role)
+
+# train
+exe = fluid.Executor(place)
+exe.run(fluid.default_startup_program())
+
+start_time = time.time()
+step = 0
+for epoch_id in range(epoch_num):
+    # feed data via loader
+    for sample in loader():
+        exe.run(feed=sample)
+        if step % 50 == 0:
+            print('Epoch={}, Step={}'.format(epoch_id, step))
+        step += 1
+
+end_time = time.time()
+print('Mpc Training of Epoch={} Batch_size={}, cost time in seconds:{}'
+      .format(epoch_num, BATCH_SIZE, (end_time - start_time)))
+
+# prediction
+prediction_file = "/tmp/mnist_output_prediction.part{}".format(role)
+for sample in test_loader():
+    prediction = exe.run(program=infer_program, feed=sample, fetch_list=[cost])
+    with open(prediction_file, 'ab') as f:
+        f.write(np.array(prediction).tostring())
+
+# decrypt
+#if 0 == role:
+#    prepare_data.decrypt_data_to_file("/tmp/mnist_output_prediction", (BATCH_SIZE,), "mpc_label")
+    
+

python/paddle_fl/mpc/examples/mnist_demo/prepare_data.py

+# Copyright (c) 2020 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.
+"""
+Prepare of MNIST data for MPC usage
+"""
+import sys
+
+import numpy as np
+import paddle
+import six
+from paddle_fl.mpc.data_utils import aby3
+
+sample_reader = paddle.dataset.mnist.train()
+test_reader = paddle.dataset.mnist.test()
+
+def generate_encrypted_data():
+    """
+    generate encrypted samples
+    """
+    def encrypted_mnist_features():
+        """
+        feature reader
+        """
+        for instance in sample_reader():
+            yield aby3.make_shares(instance[0])
+
+    def encrypted_mnist_labels():
+        """
+        label reader
+        """
+        for instance in sample_reader():
+            yield aby3.make_shares(np.array(1) if instance[1] == 0 else np.array(0))
+    
+    aby3.save_aby3_shares(encrypted_mnist_features, "/tmp/mnist2_feature")
+    aby3.save_aby3_shares(encrypted_mnist_labels, "/tmp/mnist2_label")
+
+def generate_encrypted_test_data():
+    """
+    generate encrypted samples
+    """
+    def encrypted_mnist_features():
+        """
+        feature reader
+        """
+        for instance in test_reader():
+            yield aby3.make_shares(instance[0])
+
+    def encrypted_mnist_labels():
+        """
+        label reader
+        """
+        for instance in test_reader():
+            yield aby3.make_shares(np.array(1) if instance[1] == 0 else np.array(0))
+    
+    aby3.save_aby3_shares(encrypted_mnist_features, "/tmp/mnist2_test_feature")
+    aby3.save_aby3_shares(encrypted_mnist_labels, "/tmp/mnist2_test_label")
+
+def load_decrypt_data(filepath, shape):
+    """
+    load the encrypted data and reconstruct
+    """
+    part_readers = []
+    for id in six.moves.range(3):
+        part_readers.append(aby3.load_aby3_shares(filepath, id=id, shape=shape))
+    aby3_share_reader = paddle.reader.compose(part_readers[0], part_readers[1], part_readers[2])
+
+    for instance in aby3_share_reader():
+        p = aby3.reconstruct(np.array(instance))
+        print(p)
+
+def decrypt_data_to_file(filepath, shape, decrypted_filepath):
+    """
+    load the encrypted data and reconstruct
+    """
+    part_readers = []
+    for id in six.moves.range(3):
+        part_readers.append(aby3.load_aby3_shares(filepath, id=id, shape=shape))
+    aby3_share_reader = paddle.reader.compose(part_readers[0], part_readers[1], part_readers[2])
+
+    for instance in aby3_share_reader():
+        p = aby3.reconstruct(np.array(instance))
+        with open(decrypted_filepath, 'a+') as f:
+            for i in p:
+                f.write(str(i) + '\n')
+
+# generate_encrypted_data()
+# generate_encrypted_test_data()
+

python/paddle_fl/mpc/layers/ml.py

@@ -22,7 +22,13 @@ import numpy
 from ..framework import MpcVariable
 from ..mpc_layer_helper import MpcLayerHelper
 
-__all__ = ['fc', 'relu', 'softmax']
+__all__ = [
+    'fc', 
+    'relu', 
+    'softmax',
+    'sigmoid_cross_entropy_with_logits',
+]
+
 
 # add softmax, relu
 
@@ -124,10 +130,10 @@ def fc(input,
             num_flatten_dims = len(input_shape) - 1
             param_num_flatten_dims = num_flatten_dims
         else:
-            param_num_flatten_dims = num_flatten_dims + 1  # The first dimension '2' of input is share number.
+            param_num_flatten_dims = num_flatten_dims + 1 # The first dimension '2' of input is share number.
         param_shape = [
-            reduce(lambda a, b: a * b, input_shape[param_num_flatten_dims:], 1)
-        ] + [size]
+                          reduce(lambda a, b: a * b, input_shape[param_num_flatten_dims:], 1)
+                      ] + [size]
         w = helper.create_mpc_parameter(
             attr=param_attr, shape=param_shape, dtype=dtype, is_bias=False)
         tmp = helper.create_mpc_variable_for_type_inference(dtype)
@@ -150,8 +156,7 @@ def fc(input,
             outputs={"Out": pre_bias},
             attrs={"use_mkldnn": False})
     # add bias
-    pre_activation = helper.append_mpc_bias_op(
-        pre_bias, dim_start=num_flatten_dims)
+    pre_activation = helper.append_mpc_bias_op(pre_bias, dim_start=num_flatten_dims)
     # add activation
     return helper.append_mpc_activation(pre_activation)
 
@@ -220,5 +225,39 @@ def relu(input, name=None):
     helper = MpcLayerHelper('relu', **locals())
     dtype = helper.input_dtype(input_param_name='input')
     out = helper.create_mpc_variable_for_type_inference(dtype)
-    helper.append_op(type="mpc_relu", inputs={"X": input}, outputs={"Y": out})
+    helper.append_op(
+        type="mpc_relu", inputs={"X": input}, outputs={"Y": out})
     return out
+
+
+def sigmoid_cross_entropy_with_logits(x,
+                                      label,
+                                      name=None):
+    """
+    sigmoid_cross_entropy_with_logits
+        forward: out = sigmoid(x). todo: add cross_entropy
+        backward: dx = sigmoid(x) - label
+    Args:
+        x(MpcVariable): input
+        label(MpcVariable): labels
+        name(str|None): The default value is None.  Normally there is
+            no need for user to set this property.  For more information,
+            please refer to :ref:`api_guide_Name`
+    Returns:
+        out(MpcVariable): out = sigmoid(x)
+    """
+
+    helper = MpcLayerHelper("sigmoid_cross_entropy_with_logits", **locals())
+
+    if name is None:
+        out = helper.create_mpc_variable_for_type_inference(dtype=x.dtype)
+    else:
+        out = helper.create_mpc_variable(
+            name=name, dtype=x.dtype, persistable=False)
+
+    helper.append_op(
+        type="mpc_sigmoid_cross_entropy_with_logits",
+        inputs={"X": x,
+                "Label": label},
+        outputs={"Out": out})
+    return out