test_multisampler.py

import easyvvuq as uq
from easyvvuq.actions import Actions, Encode, Decode, CreateRunDirectory
import chaospy as cp
import os
import sys
import pytest

__copyright__ = """

    Copyright 2018 Robin A. Richardson, David W. Wright

    This file is part of EasyVVUQ

    EasyVVUQ is free software: you can redistribute it and/or modify
    it under the terms of the Lesser GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    EasyVVUQ is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    Lesser GNU General Public License for more details.

    You should have received a copy of the Lesser GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

"""
__license__ = "LGPL"


# If cannonsim has not been built (to do so, run the Makefile in tests/cannonsim/src/)
# then skip this test
if not os.path.exists("tests/cannonsim/bin/cannonsim"):
    pytest.skip(
        "Skipping cannonsim test (cannonsim is not installed in tests/cannonsim/bin/)",
        allow_module_level=True)

CANNONSIM_PATH = os.path.realpath(os.path.expanduser("tests/cannonsim/bin/cannonsim"))


def test_multisampler(tmpdir):

    # Set up a fresh campaign called "cannon"
    my_campaign = uq.Campaign(name='cannon', work_dir=tmpdir)

    # Define parameter space for the cannonsim app
    params = {
        "angle": {
            "type": "float",
            "min": 0.0,
            "max": 6.28,
            "default": 0.79},
        "air_resistance": {
            "type": "float",
            "min": 0.0,
            "max": 1.0,
            "default": 0.2},
        "height": {
            "type": "float",
            "min": 0.0,
            "max": 1000.0,
            "default": 1.0},
        "time_step": {
            "type": "float",
            "min": 0.0001,
            "max": 1.0,
            "default": 0.01},
        "gravity": {
            "type": "float",
            "min": 0.0,
            "max": 1000.0,
            "default": 9.8},
        "mass": {
            "type": "float",
            "min": 0.0001,
            "max": 1000.0,
            "default": 1.0},
        "velocity": {
            "type": "float",
            "min": 0.0,
            "max": 1000.0,
            "default": 10.0}}

    # Create an encoder, decoder and collater for the cannonsim app
    encoder = uq.encoders.GenericEncoder(
        template_fname='tests/cannonsim/test_input/cannonsim.template',
        delimiter='#',
        target_filename='in.cannon')
    decoder = uq.decoders.SimpleCSV(
        target_filename='output.csv', output_columns=[
            'Dist', 'lastvx', 'lastvy'])
    execute = uq.actions.ExecuteLocal(
        os.path.abspath("tests/cannonsim/bin/cannonsim") +
        " in.cannon output.csv")
    actions = Actions(CreateRunDirectory('/tmp'), Encode(encoder), execute, Decode(decoder))
    # Add the cannonsim app
    my_campaign.add_app(name="cannonsim",
                        params=params,
                        actions=actions)

    # Set the active app to be cannonsim (this is redundant when only one app
    # has been added)
    my_campaign.set_app("cannonsim")

    # Set up samplers
    sweep1 = {
        "angle": [0.1, 0.2, 0.3],
        "height": [2.0, 10.0],
        "velocity": [10.0, 10.1, 10.2]
    }
    sampler1 = uq.sampling.BasicSweep(sweep=sweep1)

    sweep2 = {
        "air_resistance": [0.2, 0.3, 0.4]
    }
    sampler2 = uq.sampling.BasicSweep(sweep=sweep2)

    vary = {
        "gravity": cp.Uniform(1.0, 9.8),
        "mass": cp.Uniform(2.0, 10.0),
    }
    sampler3 = uq.sampling.RandomSampler(vary=vary, max_num=5)

    # Make a multisampler
    multisampler = uq.sampling.MultiSampler(sampler1, sampler2, sampler3)

    # Set the campaign to use this sampler
    my_campaign.set_sampler(multisampler)

    # Test reloading
    reloaded_campaign = uq.Campaign('cannon', db_location=my_campaign.db_location)

    my_campaign.execute(sequential=True).collate()

    # Create a BasicStats analysis element and apply it to the campaign
    stats = uq.analysis.BasicStats(qoi_cols=['Dist', 'lastvx', 'lastvy'])
    my_campaign.apply_analysis(stats)


if __name__ == "__main__":
    test_multisampler('/tmp')