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‎2018-09-20-berlin-cplusplus-meetup/Berlin-cplusplus-2018.ipynb

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"https://gitter.im/QuantStack/Lobby"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {
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"slideshow": {
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"slide_type": "skip"
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}
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},
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"outputs": [],
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"source": [
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"#include <xtensor-io/ximage.hpp>\n",
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"#include <xtensor/xtensor.hpp>\n",
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"#include <xwidgets/ximage.hpp>\n",
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"#include <xtensor/xinfo.hpp>\n",
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"\n",
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"std::vector<char> read_file(const char* filename)\n",
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"{\n",
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" std::basic_ifstream<char> file(filename, std::ios::binary);\n",
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" return std::vector<char>((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());\n",
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {
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"slideshow": {
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"slide_type": "skip"
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}
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},
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"outputs": [],
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"source": [
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"template <class E>\n",
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"std::vector<char> to_png_buffer(const xt::xexpression<E>& e)\n",
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"{\n",
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" const char* temp_filename = \"/tmp/xio_image.png\";\n",
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" xt::dump_image(temp_filename, e);\n",
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" return read_file(temp_filename);\n",
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {
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"slideshow": {
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"slide_type": "skip"
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}
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},
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"outputs": [],
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"source": [
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"template <class E>\n",
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"auto display(const E& e)\n",
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"{\n",
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" xw::image ls_image;\n",
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" ls_image.value = to_png_buffer(e);\n",
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" return ls_image;\n",
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {
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"slideshow": {
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"slide_type": "skip"
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}
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},
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"outputs": [],
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"source": [
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"template <std::ptrdiff_t I, class T, class Tuple>\n",
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"struct tuple_idx_of_impl;\n",
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"\n",
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"template <std::ptrdiff_t I, class T>\n",
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"struct tuple_idx_of_impl<I, T, std::tuple<>>\n",
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"{\n",
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" static constexpr std::ptrdiff_t value = -1;\n",
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"};\n",
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"\n",
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"template <std::ptrdiff_t I, class T, class... Types>\n",
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"struct tuple_idx_of_impl<I, T, std::tuple<T, Types...>>\n",
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"{\n",
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" static constexpr std::ptrdiff_t value = I;\n",
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"};\n",
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"\n",
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"template <std::ptrdiff_t I, class T, class U, class... Types>\n",
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"struct tuple_idx_of_impl<I, T, std::tuple<U, Types...>>\n",
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"{\n",
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" static constexpr std::ptrdiff_t value = tuple_idx_of_impl<I + 1, T, std::tuple<Types...>>::value;\n",
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"};\n",
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"\n",
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"template <class T, class Tuple>\n",
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"struct tuple_idx_of\n",
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" : std::integral_constant<std::ptrdiff_t, tuple_idx_of_impl<0, T, Tuple>::value>\n",
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"{\n",
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"};\n",
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"\n",
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"template <class R, class T, class L, std::ptrdiff_t I>\n",
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"void safe_extract(R& target, const T& args, L&& extractor, std::integral_constant<std::ptrdiff_t, I>)\n",
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"{\n",
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" target = extractor(std::get<I>(args));\n",
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"}\n",
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"\n",
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"template <class R, class T, class L>\n",
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"void safe_extract(R& target, const T& args, L&&, std::integral_constant<std::ptrdiff_t, -1>)\n",
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"{\n",
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"}\n",
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"\n",
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"template <class S, class R, class T, class L>\n",
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"constexpr void extract(R& target, const T& args, L&& extractor)\n",
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"{\n",
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" safe_extract(target, args, std::forward<L>(extractor), tuple_idx_of<S, T>{});\n",
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"}"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
@@ -241,7 +126,7 @@
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}
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},
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"source": [
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"![](images/jupyter_server.svg)"
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"![](images/jupyter_server.png)"
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]
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},
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{
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}
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},
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"source": [
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"![](images/jupyter_server_after.svg)"
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"![](images/jupyter_server_after.png)"
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]
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},
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{
@@ -263,7 +148,7 @@
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}
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},
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"source": [
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"<img src=\"images/xeus-cling.svg\" width=\"400px\"></img>\n",
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"<img src=\"images/xeus-cling.png\" width=\"400px\"></img>\n",
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"\n",
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"- xeus + cling\n",
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"- cling: clang based C++ interpreter from the CERN\n",
@@ -643,7 +528,7 @@
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"![](images/jupyter_server_after.svg)"
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"![](images/jupyter_server_after.png)"
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]
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},
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{
@@ -669,7 +554,7 @@
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}
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},
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"source": [
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"<img src=\"images/xtensor.svg\" width=\"500px\" />\n",
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"<img src=\"images/xtensor.png\" width=\"500px\" />\n",
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"\n",
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"- n-dimensional array computing library\n",
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"- Support for lazy computation, broadcasting \n",
@@ -1022,6 +907,66 @@
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"std::cout << a * brcast << std::endl;"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {
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"slideshow": {
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"slide_type": "skip"
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}
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},
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"outputs": [],
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"source": [
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"#include <xtensor-io/ximage.hpp>\n",
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"#include <xtensor/xtensor.hpp>\n",
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"#include <xwidgets/ximage.hpp>\n",
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"#include <xtensor/xinfo.hpp>\n",
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"\n",
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"std::vector<char> read_file(const char* filename)\n",
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"{\n",
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" std::basic_ifstream<char> file(filename, std::ios::binary);\n",
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" return std::vector<char>((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());\n",
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {
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"slideshow": {
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"slide_type": "skip"
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}
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},
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"outputs": [],
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"source": [
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"template <class E>\n",
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"std::vector<char> to_png_buffer(const xt::xexpression<E>& e)\n",
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"{\n",
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" const char* temp_filename = \"/tmp/xio_image.png\";\n",
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" xt::dump_image(temp_filename, e);\n",
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" return read_file(temp_filename);\n",
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {
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"slideshow": {
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"slide_type": "skip"
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}
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},
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"outputs": [],
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"source": [
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"template <class E>\n",
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"auto display(const E& e)\n",
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"{\n",
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" xw::image ls_image;\n",
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" ls_image.value = to_png_buffer(e);\n",
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" return ls_image;\n",
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 41,
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {
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"slideshow": {
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"slide_type": "skip"
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}
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},
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"outputs": [],
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"source": [
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"template <std::ptrdiff_t I, class T, class Tuple>\n",
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"struct tuple_idx_of_impl;\n",
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"\n",
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"template <std::ptrdiff_t I, class T>\n",
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"struct tuple_idx_of_impl<I, T, std::tuple<>>\n",
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"{\n",
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" static constexpr std::ptrdiff_t value = -1;\n",
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"};\n",
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"\n",
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"template <std::ptrdiff_t I, class T, class... Types>\n",
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"struct tuple_idx_of_impl<I, T, std::tuple<T, Types...>>\n",
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"{\n",
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" static constexpr std::ptrdiff_t value = I;\n",
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"};\n",
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"\n",
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"template <std::ptrdiff_t I, class T, class U, class... Types>\n",
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"struct tuple_idx_of_impl<I, T, std::tuple<U, Types...>>\n",
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"{\n",
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" static constexpr std::ptrdiff_t value = tuple_idx_of_impl<I + 1, T, std::tuple<Types...>>::value;\n",
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"};\n",
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"\n",
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"template <class T, class Tuple>\n",
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"struct tuple_idx_of\n",
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" : std::integral_constant<std::ptrdiff_t, tuple_idx_of_impl<0, T, Tuple>::value>\n",
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"{\n",
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"};\n",
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"\n",
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"template <class R, class T, class L, std::ptrdiff_t I>\n",
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"void safe_extract(R& target, const T& args, L&& extractor, std::integral_constant<std::ptrdiff_t, I>)\n",
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"{\n",
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" target = extractor(std::get<I>(args));\n",
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"}\n",
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"\n",
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"template <class R, class T, class L>\n",
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"void safe_extract(R& target, const T& args, L&&, std::integral_constant<std::ptrdiff_t, -1>)\n",
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"{\n",
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"}\n",
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"\n",
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"template <class S, class R, class T, class L>\n",
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"constexpr void extract(R& target, const T& args, L&& extractor)\n",
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"{\n",
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" safe_extract(target, args, std::forward<L>(extractor), tuple_idx_of<S, T>{});\n",
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 64,
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}
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},
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"source": [
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"<img src=\"images/jupyter_connection.svg\" width=\"80%\" />"
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"<img src=\"images/jupyter_connection.png\" width=\"80%\" />"
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]
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},
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{

‎2018-09-20-berlin-cplusplus-meetup/images/jupyter_connection.png

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‎2018-09-20-berlin-cplusplus-meetup/images/jupyter_server.png

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‎2018-09-20-berlin-cplusplus-meetup/images/jupyter_server_after.png

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‎2018-09-20-berlin-cplusplus-meetup/images/xeus-cling.png

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‎2018-09-20-berlin-cplusplus-meetup/images/xframe.png

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‎2018-09-20-berlin-cplusplus-meetup/images/xplot.png

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‎2018-09-20-berlin-cplusplus-meetup/images/xtensor.png

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