diff --git a/.gitlab/ci/build.gitlab-ci.yml b/.gitlab/ci/build.gitlab-ci.yml
index e996def7984908ea751c5e033814e81b18a3d51b..b9fdd937b358b714fd83a36d8417ad2b417d0385 100644
--- a/.gitlab/ci/build.gitlab-ci.yml
+++ b/.gitlab/ci/build.gitlab-ci.yml
@@ -136,70 +136,70 @@ build:ubuntu_python:
     paths:
       - venv/
 
-build:windows_cpp:
-  stage: build
-  needs: []
-  tags:
-    - windows
-
-  image: buildtools
-  before_script:
-    # Install Chocolatey
-    - Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
-    # Install dependencies
-    - choco install cmake.install --installargs '"ADD_CMAKE_TO_PATH=System"' -Y
-    - choco install git -Y
-    - choco install python -Y
-    # Update PATH
-    - $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
-  script:
-    # Download dependencies
-    # aidge_core
-    - 'curl "https://gitlab.eclipse.org/api/v4/projects/5139/jobs/artifacts/main/download?job=build:windows_cpp" -o build_artifacts.zip'
-    - Expand-Archive -Path .\build_artifacts.zip -DestinationPath . -Force
-    - Remove-Item .\build_cpp\ -Recurse
-
-    - $env:CMAKE_PREFIX_PATH = '../install_cpp'
-    - mkdir -p build_cpp
-    - cd build_cpp
-    - cmake -DCMAKE_INSTALL_PREFIX:PATH=../install_cpp -DCMAKE_BUILD_TYPE=Debug ..
-    - cmake --build . -j2
-    - cmake --install . --config Debug
-
-  artifacts:
-    expire_in: 1 week
-    paths:
-      - build_cpp/
-      - install_cpp/
-
-build:windows_python:
-  stage: build
-  needs: []
-  tags:
-    - windows
-
-  image: buildtools
-  before_script:
-    # Install Chocolatey
-    - Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
-    # Install dependencies
-    - choco install cmake.install --installargs '"ADD_CMAKE_TO_PATH=System"' -Y
-    - choco install git -Y
-    - choco install python -Y
-    # Update PATH
-    - $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
-  script:
-    # Download dependencies
-    # aidge_core (Python)
-    - 'curl "https://gitlab.eclipse.org/api/v4/projects/5139/jobs/artifacts/main/download?job=build:windows_python" -o build_artifacts.zip'
-    - Expand-Archive -Path .\build_artifacts.zip -DestinationPath . -Force
-
-    - python -m pip install virtualenv
-    - virtualenv venv
-    - venv\Scripts\Activate.ps1
-    - python -m pip install -r requirements.txt
-    - python -m pip install .
-  artifacts:
-    expire_in: 1 week
-    paths:
-      - venv/
+# build:windows_cpp:
+#   stage: build
+#   needs: []
+#   tags:
+#     - windows
+
+#   image: buildtools
+#   before_script:
+#     # Install Chocolatey
+#     - Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
+#     # Install dependencies
+#     - choco install cmake.install --installargs '"ADD_CMAKE_TO_PATH=System"' -Y
+#     - choco install git -Y
+#     - choco install python -Y
+#     # Update PATH
+#     - $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
+#   script:
+#     # Download dependencies
+#     # aidge_core
+#     - 'curl "https://gitlab.eclipse.org/api/v4/projects/5139/jobs/artifacts/main/download?job=build:windows_cpp" -o build_artifacts.zip'
+#     - Expand-Archive -Path .\build_artifacts.zip -DestinationPath . -Force
+#     - Remove-Item .\build_cpp\ -Recurse
+
+#     - $env:CMAKE_PREFIX_PATH = '../install_cpp'
+#     - mkdir -p build_cpp
+#     - cd build_cpp
+#     - cmake -DCMAKE_INSTALL_PREFIX:PATH=../install_cpp -DCMAKE_BUILD_TYPE=Debug ..
+#     - cmake --build . -j2
+#     - cmake --install . --config Debug
+
+#   artifacts:
+#     expire_in: 1 week
+#     paths:
+#       - build_cpp/
+#       - install_cpp/
+
+# build:windows_python:
+#   stage: build
+#   needs: []
+#   tags:
+#     - windows
+
+#   image: buildtools
+#   before_script:
+#     # Install Chocolatey
+#     - Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
+#     # Install dependencies
+#     - choco install cmake.install --installargs '"ADD_CMAKE_TO_PATH=System"' -Y
+#     - choco install git -Y
+#     - choco install python -Y
+#     # Update PATH
+#     - $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
+#   script:
+#     # Download dependencies
+#     # aidge_core (Python)
+#     - 'curl "https://gitlab.eclipse.org/api/v4/projects/5139/jobs/artifacts/main/download?job=build:windows_python" -o build_artifacts.zip'
+#     - Expand-Archive -Path .\build_artifacts.zip -DestinationPath . -Force
+
+#     - python -m pip install virtualenv
+#     - virtualenv venv
+#     - venv\Scripts\Activate.ps1
+#     - python -m pip install -r requirements.txt
+#     - python -m pip install .
+#   artifacts:
+#     expire_in: 1 week
+#     paths:
+#       - venv/
diff --git a/.gitlab/ci/test.gitlab-ci.yml b/.gitlab/ci/test.gitlab-ci.yml
index 05f567dd7430b0d3a801612ca5353a39288285d2..8f6b1e54109c4c2dcfa026fd477a93b6c0a1c641 100644
--- a/.gitlab/ci/test.gitlab-ci.yml
+++ b/.gitlab/ci/test.gitlab-ci.yml
@@ -27,23 +27,23 @@ test:ubuntu_python:
     reports:
       junit: ${CI_PROJECT_NAME}/xmlrunner-results.xml
 
-test:windows_cpp:
-  stage: test
-  needs: ["build:windows_cpp"]
-  tags:
-    - windows
-  image: buildtools
-  before_script:
-    # Install Chocolatey
-    - Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
-    # Install dependencies
-    - choco install cmake.install --installargs '"ADD_CMAKE_TO_PATH=System"' -Y
-    - choco install python -Y
-    # Update PATH
-    - $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
-  script:
-    - cd build_cpp
-    - ctest --output-junit ctest-results.xml --output-on-failure
-  artifacts:
-    reports:
-      junit: build_cpp/ctest-results.xml
+# test:windows_cpp:
+#   stage: test
+#   needs: ["build:windows_cpp"]
+#   tags:
+#     - windows
+#   image: buildtools
+#   before_script:
+#     # Install Chocolatey
+#     - Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
+#     # Install dependencies
+#     - choco install cmake.install --installargs '"ADD_CMAKE_TO_PATH=System"' -Y
+#     - choco install python -Y
+#     # Update PATH
+#     - $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
+#   script:
+#     - cd build_cpp
+#     - ctest --output-junit ctest-results.xml --output-on-failure
+#   artifacts:
+#     reports:
+#       junit: build_cpp/ctest-results.xml
diff --git a/aidge_backend_cpu/unit_tests/test_tensor.py b/aidge_backend_cpu/unit_tests/test_tensor.py
index 438b6acd51791a52c9e308fb1aceaefb2a45fb29..37531b43cf7755dfb760e575450b70bfa9a6ff68 100644
--- a/aidge_backend_cpu/unit_tests/test_tensor.py
+++ b/aidge_backend_cpu/unit_tests/test_tensor.py
@@ -16,7 +16,7 @@ class test_tensor(unittest.TestCase):
         self.assertTrue("cpu" in aidge_core.Tensor.get_available_backends())
 
     def test_numpy_int_to_tensor(self):
-        np_array = np.arange(9).reshape(1,1,3,3)
+        np_array = np.arange(9).reshape(1,1,3,3).astype(np.int32)
         # Numpy -> Tensor
         t = aidge_core.Tensor(np_array)
         self.assertEqual(t.dtype(), aidge_core.DataType.Int32)
@@ -35,6 +35,16 @@ class test_tensor(unittest.TestCase):
         for i,j in zip(t.dims(), nnarray.shape):
             self.assertEqual(i,j)
 
+    def test_numpy_int64_to_tensor(self):
+        np_array = np.arange(9).reshape(1,1,3,3).astype(np.int64)
+        # Numpy -> Tensor
+        t = aidge_core.Tensor(np_array)
+        self.assertEqual(t.dtype(), aidge_core.DataType.Int64)
+        for i_t, i_n in zip(t, np_array.flatten()):
+            self.assertTrue(i_t == i_n)
+        for i,j in zip(t.dims(), np_array.shape):
+            self.assertEqual(i,j)
+
     def test_numpy_float_to_tensor(self):
         t = aidge_core.Tensor()
         np_array = np.random.rand(1, 1, 3, 3).astype(np.float32)
@@ -49,7 +59,7 @@ class test_tensor(unittest.TestCase):
     def test_get_set(self):
         dims = [2,2,2]
 
-        np_array = np.arange(8).reshape(dims)
+        np_array = np.arange(8).reshape(dims).astype(np.int32)
         # Numpy -> Tensor
         t = aidge_core.Tensor(np_array)
         for i in range(8):
diff --git a/include/aidge/backend/cpu/data/TensorImpl.hpp b/include/aidge/backend/cpu/data/TensorImpl.hpp
index 39bfdd0a54bbaaab43c09ecc338f09723c30c1b6..ef150dc5943275d28e69294b103a74b951154500 100644
--- a/include/aidge/backend/cpu/data/TensorImpl.hpp
+++ b/include/aidge/backend/cpu/data/TensorImpl.hpp
@@ -1,3 +1,14 @@
+/********************************************************************************
+ * Copyright (c) 2023 CEA-List
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ ********************************************************************************/
+
 #ifndef AIDGE_CPU_DATA_TENSORIMPL_H_
 #define AIDGE_CPU_DATA_TENSORIMPL_H_
 
@@ -10,9 +21,10 @@
 #include "aidge/utils/future_std/span.hpp"
 
 namespace Aidge {
+
 template <class T>
 class TensorImpl_cpu : public TensorImpl {
-   private:
+private:
     const Tensor &mTensor;  // Impl needs to access Tensor information, but is not
                             // supposed to change it!
     /// Pointer to the data and its capacity
@@ -20,19 +32,19 @@ class TensorImpl_cpu : public TensorImpl {
     /// If this instance own the data, std::unique_ptr manages it
     std::unique_ptr<T[]> mDataOwner;
 
-   public:
+public:
     static constexpr const char *Backend = "cpu";
 
     TensorImpl_cpu(const Tensor &tensor) : TensorImpl(Backend), mTensor(tensor) {}
 
     bool operator==(const TensorImpl &otherImpl) const override final {
         const auto& typedOtherImpl = reinterpret_cast<const TensorImpl_cpu<T> &>(otherImpl);
-        AIDGE_INTERNAL_ASSERT(typedOtherImpl.data().size() >= mTensor.size());
+        AIDGE_INTERNAL_ASSERT(typedOtherImpl.size() >= mTensor.size());
 
         std::size_t i = 0;
         for (; i < mTensor.size() &&
-               mData[i] == typedOtherImpl.data()[i];
-             ++i) {
+               *(mData.data()+i) == *static_cast<const T*>(typedOtherImpl.rawPtr(i));
+               ++i) {
         }
         return i == mTensor.size();
     }
@@ -41,110 +53,110 @@ class TensorImpl_cpu : public TensorImpl {
         return std::make_unique<TensorImpl_cpu<T>>(tensor);
     }
 
-    // native interface
-    const future_std::span<T>& data() const { return mData; }
+    inline std::size_t size() const noexcept override final { return mData.size(); }
+    inline std::size_t scalarSize() const noexcept override final { return sizeof(T); }
 
-    std::size_t size() const override { return mData.size(); }
-    std::size_t scalarSize() const override { return sizeof(T); }
-
-    void setDevice(DeviceIdx_t device) override {
+    void setDevice(DeviceIdx_t device) override final {
         AIDGE_ASSERT(device == 0, "device cannot be != 0 for CPU backend");
     }
 
-    void copy(const void *src, NbElts_t length, NbElts_t offset = 0) override {
+    void copy(const void *src, NbElts_t length, NbElts_t offset = 0) override final {
         AIDGE_ASSERT(length <= mData.size() || length <= mTensor.size(), "copy length is above capacity");
         std::copy(static_cast<const T *>(src), static_cast<const T *>(src) + length,
                   static_cast<T *>(rawPtr()) + offset);
     }
 
-    void copyCast(const void *src, NbElts_t length, const DataType srcDt) override {
+    void copyCast(const void *src, NbElts_t length, const DataType srcDt) override final {
         if (length == 0) {
             return;
         }
 
         AIDGE_ASSERT(length <= mData.size() || length <= mTensor.size(), "copy length is above capacity");
-        if (srcDt == DataType::Float64) {
-            std::copy(static_cast<const double*>(src), static_cast<const double*>(src) + length,
-                    static_cast<T *>(rawPtr()));
-        }
-        else if (srcDt == DataType::Float32) {
-            std::copy(static_cast<const float*>(src), static_cast<const float*>(src) + length,
-                    static_cast<T *>(rawPtr()));
-        }
-        else if (srcDt == DataType::Float16) {
-            std::copy(static_cast<const half_float::half*>(src), static_cast<const half_float::half*>(src) + length,
-                    static_cast<T *>(rawPtr()));
-        }
-        else if (srcDt == DataType::Int64) {
-            std::copy(static_cast<const int64_t*>(src), static_cast<const int64_t*>(src) + length,
-                    static_cast<T *>(rawPtr()));
-        }
-        else if (srcDt == DataType::UInt64) {
-            std::copy(static_cast<const uint64_t*>(src), static_cast<const uint64_t*>(src) + length,
-                    static_cast<T *>(rawPtr()));
-        }
-        else if (srcDt == DataType::Int32) {
-            std::copy(static_cast<const int32_t*>(src), static_cast<const int32_t*>(src) + length,
-                    static_cast<T *>(rawPtr()));
-        }
-        else if (srcDt == DataType::UInt32) {
-            std::copy(static_cast<const uint32_t*>(src), static_cast<const uint32_t*>(src) + length,
-                    static_cast<T *>(rawPtr()));
-        }
-        else if (srcDt == DataType::Int16) {
-            std::copy(static_cast<const int16_t*>(src), static_cast<const int16_t*>(src) + length,
-                    static_cast<T *>(rawPtr()));
-        }
-        else if (srcDt == DataType::UInt16) {
-            std::copy(static_cast<const uint16_t*>(src), static_cast<const uint16_t*>(src) + length,
-                    static_cast<T *>(rawPtr()));
-        }
-        else if (srcDt == DataType::Int8) {
-            std::copy(static_cast<const int8_t*>(src), static_cast<const int8_t*>(src) + length,
-                    static_cast<T *>(rawPtr()));
-        }
-        else if (srcDt == DataType::UInt8) {
-            std::copy(static_cast<const uint8_t*>(src), static_cast<const uint8_t*>(src) + length,
-                    static_cast<T *>(rawPtr()));
-        }
-        else {
-            AIDGE_THROW_OR_ABORT(std::runtime_error, "Unsupported data type.");
+        switch (srcDt)
+        {
+            case DataType::Float64:
+                std::copy(static_cast<const double*>(src), static_cast<const double*>(src) + length,
+                        static_cast<T *>(rawPtr()));
+                break;
+            case DataType::Float32:
+                std::copy(static_cast<const float*>(src), static_cast<const float*>(src) + length,
+                        static_cast<T *>(rawPtr()));
+                break;
+            case DataType::Float16:
+                std::copy(static_cast<const half_float::half*>(src), static_cast<const half_float::half*>(src) + length,
+                        static_cast<T *>(rawPtr()));
+                break;
+            case DataType::Int64:
+                std::copy(static_cast<const int64_t*>(src), static_cast<const int64_t*>(src) + length,
+                        static_cast<T *>(rawPtr()));
+                break;
+            case DataType::UInt64:
+                std::copy(static_cast<const uint64_t*>(src), static_cast<const uint64_t*>(src) + length,
+                        static_cast<T *>(rawPtr()));
+                break;
+            case DataType::Int32:
+                std::copy(static_cast<const int32_t*>(src), static_cast<const int32_t*>(src) + length,
+                        static_cast<T *>(rawPtr()));
+                break;
+            case DataType::UInt32:
+                std::copy(static_cast<const uint32_t*>(src), static_cast<const uint32_t*>(src) + length,
+                        static_cast<T *>(rawPtr()));
+                break;
+            case DataType::Int16:
+                std::copy(static_cast<const int16_t*>(src), static_cast<const int16_t*>(src) + length,
+                        static_cast<T *>(rawPtr()));
+                break;
+            case DataType::UInt16:
+                std::copy(static_cast<const uint16_t*>(src), static_cast<const uint16_t*>(src) + length,
+                        static_cast<T *>(rawPtr()));
+                break;
+            case DataType::Int8:
+                std::copy(static_cast<const int8_t*>(src), static_cast<const int8_t*>(src) + length,
+                        static_cast<T *>(rawPtr()));
+                break;
+            case DataType::UInt8:
+                std::copy(static_cast<const uint8_t*>(src), static_cast<const uint8_t*>(src) + length,
+                        static_cast<T *>(rawPtr()));
+                break;
+            default:
+                AIDGE_THROW_OR_ABORT(std::runtime_error, "Unsupported data type.");
+                break;
         }
     }
 
-    void copyFromDevice(const void *src, NbElts_t length, const std::pair<std::string, DeviceIdx_t>& device) override {
+    void copyFromDevice(const void *src, NbElts_t length, const std::pair<std::string, DeviceIdx_t>& device) override final {
         AIDGE_ASSERT(device.first == Backend, "backend must match");
         AIDGE_ASSERT(device.second == 0, "device cannot be != 0 for CPU backend");
         copy(src, length);
     }
 
-    void copyFromHost(const void *src, NbElts_t length) override {
+    inline void copyFromHost(const void *src, NbElts_t length) override final {
         copy(src, length);
     }
 
-    void copyToHost(void *dst, NbElts_t length) const override {
+    void copyToHost(void *dst, NbElts_t length) const override final {
         AIDGE_ASSERT(length <= mData.size() || length <= mTensor.size(), "copy length is above capacity");
         const T* src = static_cast<const T*>(rawPtr());
         std::copy(static_cast<const T *>(src), static_cast<const T *>(src) + length,
                   static_cast<T *>(dst));
     }
 
-    void *rawPtr(NbElts_t offset = 0) override {
+    void *rawPtr(NbElts_t offset = 0) override final {
         lazyInit();
         return (mData.data() + offset);
     };
 
-    const void *rawPtr(NbElts_t offset = 0) const override {
+    const void *rawPtr(NbElts_t offset = 0) const override final {
         AIDGE_ASSERT(mData.size() >= mTensor.size(), "accessing uninitialized const rawPtr");
         return (mData.data() + offset);
     };
 
-    void *hostPtr(NbElts_t offset = 0) override {
+    void *hostPtr(NbElts_t offset = 0) override final {
         lazyInit();
         return (mData.data() + offset);
     };
 
-    const void *hostPtr(NbElts_t offset = 0) const override {
+    const void *hostPtr(NbElts_t offset = 0) const override final {
         AIDGE_ASSERT(mData.size() >= mTensor.size(), "accessing uninitialized const hostPtr");
         return (mData.data() + offset);
     };
@@ -174,6 +186,8 @@ static Registrar<Tensor> registrarTensorImpl_cpu_Float32(
         {"cpu", DataType::Float32}, Aidge::TensorImpl_cpu<float>::create);
 static Registrar<Tensor> registrarTensorImpl_cpu_Float16(
         {"cpu", DataType::Float16}, Aidge::TensorImpl_cpu<half_float::half>::create);
+static Registrar<Tensor> registrarTensorImpl_cpu_Int64(
+        {"cpu", DataType::Int64}, Aidge::TensorImpl_cpu<long>::create);
 static Registrar<Tensor> registrarTensorImpl_cpu_Int32(
         {"cpu", DataType::Int32}, Aidge::TensorImpl_cpu<int>::create);
 static Registrar<Tensor> registrarTensorImpl_cpu_Int16(
@@ -184,8 +198,6 @@ static Registrar<Tensor> registrarTensorImpl_cpu_Int8(
         {"cpu", DataType::Int8}, Aidge::TensorImpl_cpu<int8_t>::create);
 static Registrar<Tensor> registrarTensorImpl_cpu_UInt8(
         {"cpu", DataType::UInt8}, Aidge::TensorImpl_cpu<uint8_t>::create);
-
-
 }  // namespace
 }  // namespace Aidge