Initial import as a separate torch_xla extension

Skip tests which require additional work.

.gitmodules

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+[submodule "third_party/tensorflow"]
+	path = third_party/tensorflow
+	url = https://github.com/tensorflow/tensorflow.git

LICENSE

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+Copyright (c) 2018 Google Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+3. Neither the names of Facebook, Deepmind Technologies, NYU, NEC Laboratories America
+   and IDIAP Research Institute nor the names of its contributors may be
+   used to endorse or promote products derived from this software without
+   specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.

README.md

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+# How To Build And Run PyTorch For TPU
+
+To build:
+
+* Build PyTorch from source, following the regular [instructions](https://github.com/pytorch/pytorch#from-source).
+* Clone this repository in the root folder of the PyTorch sources used for the previous step.
+  Run `git submodule update --init` to get the third-party dependencies and `python setup.py install` to build and install the extension.
+
+To run the tests, follow __one__ of the options below:
+
+* Run on CPU using the local client:
+
+  `export XLA_USE_XRT=0 export XLA_GRPC_HOST="" XLA_PLATFORM="CPU"`
+
+* Run on CPU using the XRT client:
+
+  `export XLA_USE_XRT=1 XRT_DEVICE_MAP="CPU:0;/job:localhost/replica:0/task:0/device:XLA_CPU:0" XRT_WORKERS="localhost:0;"`
+
+* Run on TPU using the XRT client:
+
+  `export XLA_USE_XRT=1 XRT_DEVICE_MAP="TPU:0;/job:tpu_worker/replica:0/task:0/device:TPU:0" XRT_WORKERS="tpu_worker:0;grpc://localhost:51000"`
+
+Then run `python test/test_operations.py`. Some of the tests are currently skipped.

build_torch_xla_libs.sh

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+#!/usr/bin/env bash
+
+set -ex
+
+cd "$(dirname "$0")"
+PWD=`printf "%q\n" "$(pwd)"`
+BASE_DIR="$PWD"
+echo $BASE_DIR
+THIRD_PARTY_DIR="$BASE_DIR/third_party"
+
+cp -r -f $THIRD_PARTY_DIR/xla_client $THIRD_PARTY_DIR/tensorflow/tensorflow/compiler/xla/
+
+pushd $THIRD_PARTY_DIR/tensorflow
+git reset --hard
+git clean -f
+bazel build -c opt //tensorflow/compiler/xla/xla_client:libxla_computation_client.so
+popd
+
+mkdir -p torch_xla/lib
+chmod 0644 $THIRD_PARTY_DIR/tensorflow/bazel-bin/tensorflow/compiler/xla/xla_client/libxla_computation_client.so
+cp $THIRD_PARTY_DIR/tensorflow/bazel-bin/tensorflow/compiler/xla/xla_client/libxla_computation_client.so torch_xla/lib
+chmod 0644 $THIRD_PARTY_DIR/tensorflow/bazel-bin/tensorflow/libtensorflow_framework.so
+cp $THIRD_PARTY_DIR/tensorflow/bazel-bin/tensorflow/libtensorflow_framework.so torch_xla/lib

setup.py

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+#!/usr/bin/env python
+
+from setuptools import setup, find_packages
+from torch.utils.cpp_extension import BuildExtension, CppExtension
+import os
+import platform
+import subprocess
+import sys
+
+
+def _check_env_flag(name, default=''):
+    return os.getenv(name, default).upper() in ['ON', '1', 'YES', 'TRUE', 'Y']
+
+torch_xla_sources = [
+    'torch_xla/csrc/batch_norm.cpp',
+    'torch_xla/csrc/convolution.cpp',
+    'torch_xla/csrc/cross_replica_reduces.cpp',
+    'torch_xla/csrc/data_ops.cpp',
+    'torch_xla/csrc/elementwise.cpp',
+    'torch_xla/csrc/graph_context.cpp',
+    'torch_xla/csrc/helpers.cpp',
+    'torch_xla/csrc/init_python_bindings.cpp',
+    'torch_xla/csrc/log_softmax.cpp',
+    'torch_xla/csrc/module.cpp',
+    'torch_xla/csrc/nll_loss.cpp',
+    'torch_xla/csrc/pooling.cpp',
+    'torch_xla/csrc/reduction.cpp',
+    'torch_xla/csrc/tensor.cpp',
+    'torch_xla/csrc/torch_util.cpp',
+    'torch_xla/csrc/translator.cpp',
+    'torch_xla/csrc/passes/eval_static_size.cpp',
+    'torch_xla/csrc/passes/remove_unused_forward_outputs.cpp',
+    'torch_xla/csrc/passes/replace_untraced_operators.cpp',
+    'torch_xla/csrc/passes/threshold_backward_peephole.cpp',
+]
+
+build_libs_cmd = './build_torch_xla_libs.sh'
+
+if subprocess.call(build_libs_cmd) != 0:
+    print("Failed to run '{}'".format(build_libs_cmd))
+    sys.exit(1)
+
+# Constant known variables used throughout this file
+cwd = os.path.dirname(os.path.abspath(__file__))
+lib_path = os.path.join(cwd, 'torch_xla', 'lib')
+pytorch_source_path = os.getenv('PYTORCH_SOURCE_PATH', '..')
+third_party_path = os.path.join(cwd, 'third_party')
+
+include_dirs = [
+    third_party_path + '/tensorflow/bazel-tensorflow',
+    third_party_path + '/tensorflow/bazel-genfiles',
+    third_party_path + '/tensorflow/bazel-tensorflow/external/protobuf_archive/src',
+    third_party_path + '/tensorflow/bazel-tensorflow/external/eigen_archive',
+    third_party_path + '/tensorflow/bazel-tensorflow/external/com_google_absl',
+]
+include_dirs += [
+    pytorch_source_path,
+    os.path.join(pytorch_source_path, 'torch', 'csrc'),
+    os.path.join(pytorch_source_path, 'torch', 'lib', 'tmp_install', 'include'),
+]
+
+library_dirs = []
+library_dirs.append(lib_path)
+
+extra_link_args = []
+
+DEBUG = _check_env_flag('DEBUG')
+IS_WINDOWS = (platform.system() == 'Windows')
+IS_DARWIN = (platform.system() == 'Darwin')
+IS_LINUX = (platform.system() == 'Linux')
+
+
+def make_relative_rpath(path):
+    if IS_DARWIN:
+        return '-Wl,-rpath,@loader_path/' + path
+    elif IS_WINDOWS:
+        return ''
+    else:
+        return '-Wl,-rpath,$ORIGIN/' + path
+
+extra_compile_args = []
+
+if DEBUG:
+    if IS_WINDOWS:
+        extra_link_args.append('/DEBUG:FULL')
+    else:
+        extra_compile_args += ['-O0', '-g']
+        extra_link_args += ['-O0', '-g']
+
+extra_link_args += ['-lxla_computation_client']
+
+setup(
+    name='torch_xla',
+    version='0.1',
+    description='XLA bridge for PyTorch',
+    url='https://github.com/pytorch/xla',
+    author='Alex Suhan, Davide Libenzi',
+    author_email='[email protected]',
+    # Exclude the build files.
+    packages=find_packages(exclude=['build']),
+    ext_modules=[
+        CppExtension(
+            '_C',
+            torch_xla_sources,
+            include_dirs=include_dirs,
+            extra_compile_args=extra_compile_args,
+            library_dirs=library_dirs,
+            extra_link_args=extra_link_args + [make_relative_rpath('torch_xla/lib')],
+        ),
+    ],
+    package_data={
+        'torch_xla': [
+            'lib/*.so*',
+        ]
+    },
+    cmdclass={'build_ext': BuildExtension})