# Copyright 2013-2023 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)

import json

from spack.package import *


class PyChainer(PythonPackage):
    """
    Chainer is a Python-based deep learning framework aiming at flexibility.

    It provides automatic differentiation APIs based on the define-by-run
    approach (a.k.a. dynamic computational graphs) as well as object-oriented
    high-level APIs to build and train neural networks.
    It also supports CUDA/cuDNN using CuPy for high performance training
    and inference.
    """

    homepage = "https://chainer.org/"
    url = "https://github.com/chainer/chainer/archive/v7.2.0.tar.gz"

    maintainers("adamjstewart")

    skip_modules = ["onnx_chainer"]

    license("MIT")

    version("7.2.0", sha256="6e2fba648cc5b8a5421e494385b76fe5ec154f1028a1c5908557f5d16c04f0b3")
    version("6.7.0", sha256="87cb3378a35e7c5c695028ec91d58dc062356bc91412384ea939d71374610389")

    variant("mn", default=False, description="run with ChainerMN")

    depends_on("python@3.5.1:", when="@7:", type=("build", "run"))
    depends_on("py-setuptools", type=("build", "run"))
    depends_on("py-numpy@1.9:", type=("build", "run"))
    depends_on("py-six@1.9.0:", type=("build", "run"))
    depends_on("py-typing-extensions", type=("build", "run"))
    depends_on("py-typing-extensions@:3.6.6", when="@:6", type=("build", "run"))
    depends_on("py-filelock", type=("build", "run"))
    depends_on("py-protobuf@3:", type=("build", "run"))

    # Dependencies only required for test of ChainerMN
    depends_on("py-matplotlib", type=("build", "run"), when="+mn")
    depends_on("py-mpi4py", type=("build", "run"), when="+mn")
    depends_on("mpi", type=("build", "run"), when="+mn")

    @run_after("install")
    def cache_test_sources(self):
        if "+mn" in self.spec:
            self.cache_extra_test_sources("examples")

    def test_chainermn(self):
        """run the ChainerMN test"""
        if "+mn" not in self.spec:
            raise SkipTest("Test only supported when built with +mn")

        mnist_file = join_path(self.install_test_root.examples.chainermn.mnist, "train_mnist.py")
        mpirun = which(self.spec["mpi"].prefix.bin.mpirun)
        opts = ["-n", "4", self.spec["python"].command.path, mnist_file, "-o", "."]
        env["OMP_NUM_THREADS"] = "4"

        mpirun(*opts)

        # check results
        json_open = open(join_path(".", "log"), "r")
        json_load = json.load(json_open)
        v = dict([(d.get("epoch"), d.get("main/accuracy")) for d in json_load])
        assert (1 in v) or (20 in v), "Cannot find epoch 1 or epoch 20"
        assert abs(1.0 - v[1]) >= abs(1.0 - v[20]), "ChainerMN Test Failed!"