nilmdb/tests/test_interval.py

# -*- coding: utf-8 -*-

import nilmdb
from nilmdb.utils.printf import *
from nilmdb.utils import datetime_tz

from nose.tools import *
from nose.tools import assert_raises
import itertools

from nilmdb.server.interval import (Interval, DBInterval,
                                    IntervalSet, IntervalError)

from testutil.helpers import *
import unittest

# set to False to skip live renders
do_live_renders = False
def render(iset, description = "", live = True):
    import testutil.renderdot as renderdot
    r = renderdot.RBTreeRenderer(iset.tree)
    return r.render(description, live and do_live_renders)

def makeset(string):
    """Build an IntervalSet from a string, for testing purposes

    Each character is 1 second
    [ = interval start
    | = interval end + next start
    ] = interval end
    . = zero-width interval (identical start and end)
    anything else is ignored
    """
    iset = IntervalSet()
    for i, c in enumerate(string):
        day = i + 10000
        if (c == "["):
            start = day
        elif (c == "|"):
            iset += Interval(start, day)
            start = day
        elif (c == ")"):
            iset += Interval(start, day)
            del start
        elif (c == "."):
            iset += Interval(day, day)
    return iset

class TestInterval:
    def test_interval(self):
        # Test Interval class
        os.environ['TZ'] = "America/New_York"
        datetime_tz._localtz = None
        (d1, d2, d3) = [ datetime_tz.datetime_tz.smartparse(x).totimestamp()
                         for x in [ "03/24/2012", "03/25/2012", "03/26/2012" ] ]

        # basic construction
        i = Interval(d1, d2)
        i = Interval(d1, d3)
        eq_(i.start, d1)
        eq_(i.end, d3)

        # assignment is allowed, but not verified
        i.start = d2
        #with assert_raises(IntervalError):
        #    i.end = d1
        i.start = d1
        i.end = d2

        # end before start
        with assert_raises(IntervalError):
            i = Interval(d3, d1)

        # compare
        assert(Interval(d1, d2) == Interval(d1, d2))
        assert(Interval(d1, d2) < Interval(d1, d3))
        assert(Interval(d1, d3) > Interval(d1, d2))
        assert(Interval(d1, d2) < Interval(d2, d3))
        assert(Interval(d1, d3) < Interval(d2, d3))
        assert(Interval(d2, d2+0.01) > Interval(d1, d3))
        assert(Interval(d3, d3+0.01) == Interval(d3, d3+0.01))
        #with assert_raises(TypeError): # was AttributeError, that's wrong
        #    x = (i == 123)

        # subset
        eq_(Interval(d1, d3).subset(d1, d2), Interval(d1, d2))
        with assert_raises(IntervalError):
            x = Interval(d2, d3).subset(d1, d2)

        # big integers and floats
        x = Interval(5000111222, 6000111222)
        eq_(str(x), "[5000111222.0 -> 6000111222.0)")
        x = Interval(123.45, 234.56)
        eq_(str(x), "[123.45 -> 234.56)")

        # misc
        i = Interval(d1, d2)
        eq_(repr(i), repr(eval(repr(i))))
        eq_(str(i), "[1332561600.0 -> 1332648000.0)")

    def test_interval_intersect(self):
        # Test Interval intersections
        dates = [ 100, 200, 300, 400 ]
        perm = list(itertools.permutations(dates, 2))
        prod = list(itertools.product(perm, perm))
        should_intersect = {
            False: [4, 5, 8, 20, 48, 56, 60, 96, 97, 100],
            True: [0, 1, 2, 12, 13, 14, 16, 17, 24, 25, 26, 28, 29,
                   32, 49, 50, 52, 53, 61, 62, 64, 65, 68, 98, 101, 104]
            }
        for i,((a,b),(c,d)) in enumerate(prod):
            try:
                i1 = Interval(a, b)
                i2 = Interval(c, d)
                eq_(i1.intersects(i2), i2.intersects(i1))
                in_(i, should_intersect[i1.intersects(i2)])
            except IntervalError:
                assert(i not in should_intersect[True] and
                       i not in should_intersect[False])
        with assert_raises(TypeError):
            x = i1.intersects(1234)

    def test_intervalset_construct(self):
        # Test IntervalSet construction
        dates = [ 100, 200, 300, 400 ]

        a = Interval(dates[0], dates[1])
        b = Interval(dates[1], dates[2])
        c = Interval(dates[0], dates[2])
        d = Interval(dates[2], dates[3])

        iseta = IntervalSet(a)
        isetb = IntervalSet([a, b])
        isetc = IntervalSet([a])
        ne_(iseta, isetb)
        eq_(iseta, isetc)
        with assert_raises(TypeError):
            x = iseta != 3
        ne_(IntervalSet(a), IntervalSet(b))

        # Note that assignment makes a new reference (not a copy)
        isetd = IntervalSet(isetb)
        isete = isetd
        eq_(isetd, isetb)
        eq_(isetd, isete)
        isetd -= a
        ne_(isetd, isetb)
        eq_(isetd, isete)

        # test iterator
        for interval in iseta:
            pass

        # overlap
        with assert_raises(IntervalError):
            x = IntervalSet([a, b, c])

        # bad types
        with assert_raises(Exception):
            x = IntervalSet([1, 2])

        iset = IntervalSet(isetb)   # test iterator
        eq_(iset, isetb)
        eq_(len(iset), 2)
        eq_(len(IntervalSet()), 0)

        # Test adding
        iset = IntervalSet(a)
        iset += IntervalSet(b)
        eq_(iset, IntervalSet([a, b]))

        iset = IntervalSet(a)
        iset += b
        eq_(iset, IntervalSet([a, b]))

        iset = IntervalSet(a)
        iset.iadd_nocheck(b)
        eq_(iset, IntervalSet([a, b]))

        iset = IntervalSet(a) + IntervalSet(b)
        eq_(iset, IntervalSet([a, b]))

        iset = IntervalSet(b) + a
        eq_(iset, IntervalSet([a, b]))

        # A set consisting of [0-1],[1-2] should match a set consisting of [0-2]
        eq_(IntervalSet([a,b]), IntervalSet([c]))
        # Etc
        ne_(IntervalSet([a,d]), IntervalSet([c]))
        ne_(IntervalSet([c]), IntervalSet([a,d]))
        ne_(IntervalSet([c,d]), IntervalSet([b,d]))

        # misc
        eq_(repr(iset), repr(eval(repr(iset))))
        eq_(str(iset), "[[100.0 -> 200.0), [200.0 -> 300.0)]")

    def test_intervalset_geniset(self):
        # Test basic iset construction
        eq_(makeset("  [----)   "),
            makeset("  [-|--)   "))

        eq_(makeset("[)  [--)   ") +
            makeset(" [)    [--)"),
            makeset("[|) [-----)"))

        eq_(makeset("  [-------)"),
            makeset("  [-|-----|"))


    def test_intervalset_intersect(self):
        # Test intersection (&)
        with assert_raises(TypeError): # was AttributeError
            x = makeset("[--)") & 1234

        # Intersection with interval
        eq_(makeset("[---|---)[)") &
            list(makeset("  [------) "))[0],
            makeset("  [-----)  "))

        # Intersection with sets
        eq_(makeset("[---------)") &
            makeset(" [---)     "),
            makeset(" [---)     "))

        eq_(makeset(" [---)     ") &
            makeset("[---------)"),
            makeset(" [---)     "))

        eq_(makeset("    [-----)") &
            makeset(" [-----)   "),
            makeset("    [--)   "))

        eq_(makeset(" [--)  [--)") &
            makeset("  [------) "),
            makeset("  [-)  [-) "))

        eq_(makeset("      [---)") &
            makeset(" [--)      "),
            makeset("           "))

        eq_(makeset("    [-|---)") &
            makeset(" [-----|-) "),
            makeset("    [----) "))

        eq_(makeset("    [-|-)  ") &
            makeset(" [-|--|--) "),
            makeset("    [---)  "))

        # Border cases -- will give different results if intervals are
        # half open or fully closed.  Right now, they are half open,
        # although that's a little messy since the database intervals
        # often contain a data point at the endpoint.
        half_open = True
        if half_open:
            eq_(makeset("      [---)") &
                makeset(" [----)    "),
                makeset("           "))
            eq_(makeset(" [----)[--)") &
                makeset("[-) [--) [)"),
                makeset(" [) [-)  [)"))
        else:
            eq_(makeset("      [---)") &
                makeset(" [----)    "),
                makeset("      .    "))
            eq_(makeset(" [----)[--)") &
                makeset("[-) [--) [)"),
                makeset(" [) [-). [)"))

class TestIntervalDB:
    def test_dbinterval(self):
        # Test DBInterval class
        i = DBInterval(100, 200, 100, 200, 10000, 20000)
        eq_(i.start, 100)
        eq_(i.end, 200)
        eq_(i.db_start, 100)
        eq_(i.db_end, 200)
        eq_(i.db_startpos, 10000)
        eq_(i.db_endpos, 20000)
        eq_(repr(i), repr(eval(repr(i))))

        # end before start
        with assert_raises(IntervalError):
            i = DBInterval(200, 100, 100, 200, 10000, 20000)

        # db_start too late
        with assert_raises(IntervalError):
            i = DBInterval(100, 200, 150, 200, 10000, 20000)

        # db_end too soon
        with assert_raises(IntervalError):
            i = DBInterval(100, 200, 100, 150, 10000, 20000)

        # actual start, end can be a subset
        a = DBInterval(150, 200, 100, 200, 10000, 20000)
        b = DBInterval(100, 150, 100, 200, 10000, 20000)
        c = DBInterval(150, 160, 100, 200, 10000, 20000)

        # Make a set of DBIntervals
        iseta = IntervalSet([a, b])
        isetc = IntervalSet(c)
        assert(iseta.intersects(a))
        assert(iseta.intersects(b))

        # Test subset
        with assert_raises(IntervalError):
            x = a.subset(150, 250)

        # Subset of those IntervalSets should still contain DBIntervals
        for i in IntervalSet(iseta.intersection(Interval(125,250))):
            assert(isinstance(i, DBInterval))

class TestIntervalTree:

    def test_interval_tree(self):
        import random
        random.seed(1234)

        # make a set of 100 intervals
        iset = IntervalSet()
        j = 100
        for i in random.sample(xrange(j),j):
            interval = Interval(i, i+1)
            iset += interval
        render(iset, "Random Insertion")

        # remove about half of them
        for i in random.sample(xrange(j),j):
            if random.randint(0,1):
                iset -= Interval(i, i+1)

        # try removing an interval that doesn't exist
        with assert_raises(IntervalError):
            iset -= Interval(1234,5678)
        render(iset, "Random Insertion, deletion")

        # make a set of 100 intervals, inserted in order
        iset = IntervalSet()
        j = 100
        for i in xrange(j):
            interval = Interval(i, i+1)
            iset += interval
        render(iset, "In-order insertion")

class TestIntervalSpeed:
    @unittest.skip("this is slow")
    def test_interval_speed(self):
        import yappi
        import time
        import testutil.aplotter as aplotter
        import random
        import math

        print
        yappi.start()
        speeds = {}
        limit = 10 # was 20
        for j in [ 2**x for x in range(5,limit) ]:
            start = time.time()
            iset = IntervalSet()
            for i in random.sample(xrange(j),j):
                interval = Interval(i, i+1)
                iset += interval
            speed = (time.time() - start) * 1000000.0
            printf("%d: %g μs (%g μs each, O(n log n) ratio %g)\n",
                   j,
                   speed,
                   speed/j,
                   speed / (j*math.log(j))) # should be constant
            speeds[j] = speed
        aplotter.plot(speeds.keys(), speeds.values(), plot_slope=True)
        yappi.stop()
        yappi.print_stats(sort_type=yappi.SORTTYPE_TTOT, limit=10)