コード例 #1
0
ファイル: test_gp.py プロジェクト: zhucer2003/george
def test_apply_inverse(solver, seed=1234, N=201, yerr=0.1):
    np.random.seed(seed)

    # Set up the solver.
    kernel = 1.0 * kernels.ExpSquaredKernel(0.5)
    kwargs = dict()
    if solver == HODLRSolver:
        kwargs["tol"] = 1e-10
    gp = GP(kernel, solver=solver, **kwargs)

    # Sample some data.
    x = np.sort(np.random.rand(N))
    y = gp.sample(x)
    gp.compute(x, yerr=yerr)

    K = gp.get_matrix(x)
    K[np.diag_indices_from(K)] += yerr**2

    b1 = np.linalg.solve(K, y)
    b2 = gp.apply_inverse(y)
    assert np.allclose(b1, b2)

    y = gp.sample(x, size=5).T
    b1 = np.linalg.solve(K, y)
    b2 = gp.apply_inverse(y)
    assert np.allclose(b1, b2)
コード例 #2
0
ファイル: test_gp.py プロジェクト: zhucer2003/george
def test_predict_single(solver, seed=1234, N=201, yerr=0.1):
    np.random.seed(seed)

    # Set up the solver.
    kernel = 1.0 * kernels.ExpSquaredKernel(0.5)
    kwargs = dict()
    if solver == HODLRSolver:
        kwargs["tol"] = 1e-8
    gp = GP(kernel, solver=solver, **kwargs)

    x = np.sort(np.random.rand(N))
    y = gp.sample(x)
    gp.compute(x, yerr=yerr)
    mu0, var0 = gp.predict(y, [0.0], return_var=True)
    mu, var = gp.predict(y, [0.0, 1.0], return_var=True)
    _, cov = gp.predict(y, [0.0, 1.0])
    assert np.allclose(mu0, mu[0])
    assert np.allclose(var0, var[0])
    assert np.allclose(var0, cov[0, 0])
コード例 #3
0
ファイル: test_gp.py プロジェクト: zhucer2003/george
def test_gradient(solver, white_noise, seed=123, N=305, ndim=3, eps=1.32e-3):
    np.random.seed(seed)

    # Set up the solver.
    kernel = 1.0 * kernels.ExpSquaredKernel(0.5, ndim=ndim)
    kwargs = dict()
    if white_noise is not None:
        kwargs = dict(white_noise=white_noise, fit_white_noise=True)
    if solver == HODLRSolver:
        kwargs["tol"] = 1e-8
    gp = GP(kernel, solver=solver, **kwargs)

    # Sample some data.
    x = np.random.rand(N, ndim)
    x = x[np.argsort(x[:, 0])]
    y = gp.sample(x)
    gp.compute(x, yerr=0.1)

    # Compute the initial gradient.
    grad0 = gp.grad_log_likelihood(y)
    vector = gp.get_parameter_vector()

    for i, v in enumerate(vector):
        # Compute the centered finite difference approximation to the gradient.
        vector[i] = v + eps
        gp.set_parameter_vector(vector)
        lp = gp.lnlikelihood(y)

        vector[i] = v - eps
        gp.set_parameter_vector(vector)
        lm = gp.lnlikelihood(y)

        vector[i] = v
        gp.set_parameter_vector(vector)

        grad = 0.5 * (lp - lm) / eps
        assert np.abs(grad - grad0[i]) < 5 * eps, \
            "Gradient computation failed in dimension {0} ({1})\n{2}" \
            .format(i, solver.__name__, np.abs(grad - grad0[i]))
コード例 #4
0
    def add_spots(self,QP=[5e-5,0.5,30.,28.]):
        """
        This attribute add stellar variability using a Quasi-periodic Kernel
        The activity is added using a george Kernel
        """

        if not hasattr(self,'flux_spots'):

            A  = QP[0]
            le = QP[1]
            lp = QP[2]
            P  = QP[3]

            from george import kernels, GP
            k = A * kernels.ExpSine2Kernel(gamma=1./2/lp,log_period=np.log(P)) * \
            kernels.ExpSquaredKernel(metric=le)
            gp = GP(k)
            self.flux_spots = 1 + gp.sample(self.time)

        self.flux = self.flux * self.flux_spots

        self.spots = True
コード例 #5
0
class MockLC:
    pb_names = "g' r' i' z'".split()
    pb_centers = 1e-9 * array([470, 640, 780, 900])
    npb = len(pb_names)

    def __init__(self, setup: SimulationSetup, **kwargs):
        self.setup = self.s = s = setup
        self.t_exposure_d = Qty(kwargs.get('exptime', 60), 's').rescale('d')
        self.t_baseline_d = Qty(s.t_baseline, 'h').rescale('d')
        self.ldcs = s.ldcs
        self.tm = QuadraticModel(klims=(0.01, 0.99), nk=512)

        self.filters = "g' r' i' z'".split()
        self.npb = len(self.filters)
        self.k_apparent, self.p, self.a, self.b, self.i = s.orbital_parameters

        self.duration_d = Qty(
            duration_eccentric(self.p, self.k_apparent, self.a, self.i, 0, 0,
                               1), 'd')

        # Contamination
        # -------------
        qe_be = TabulatedFilter('1024B_eXcelon', [
            300, 325, 350, 400, 450, 500, 700, 800, 850, 900, 950, 1050, 1150
        ], [
            0.0, 0.1, 0.25, 0.60, 0.85, 0.92, 0.96, 0.85, 0.70, 0.50, 0.30,
            0.05, 0.0
        ])
        qe_b = TabulatedFilter(
            '2014B', [300, 350, 500, 550, 700, 800, 1000, 1050],
            [0.10, 0.20, 0.90, 0.96, 0.90, 0.75, 0.11, 0.05])
        qes = qe_be, qe_b, qe_be, qe_be

        self.instrument = instrument = Instrument(
            'MuSCAT2', (sdss_g, sdss_r, sdss_i, sdss_z), qes)
        self.contaminator = SMContamination(instrument, "i'")

        self.hteff = setup.hteff
        self.cteff = setup.cteff
        self.i_contamination = setup.c
        self.k_true = setup.k_apparent / sqrt(1 - self.i_contamination)
        self.contamination = self.contaminator.contamination(
            self.i_contamination, self.hteff, self.cteff)

    @property
    def t_total_d(self):
        return self.duration_d + 2 * self.t_baseline_d

    @property
    def duration_h(self):
        return self.duration_d.rescale('h')

    @property
    def n_exp(self):
        return int(self.t_total_d // self.t_exposure_d)

    def __call__(self,
                 rseed=0,
                 ldcs=None,
                 wnsigma=None,
                 rnsigma=None,
                 rntscale=0.5):
        return self.create(rseed, ldcs, wnsigma, rnsigma, rntscale)

    def create(self,
               rseed=0,
               ldcs=None,
               wnsigma=None,
               rnsigma=None,
               rntscale=0.5,
               nights=1):
        ldcs = ldcs if ldcs is not None else self.ldcs
        seed(rseed)

        self.time = linspace(-0.5 * float(self.t_total_d),
                             0.5 * float(self.t_total_d), self.n_exp)
        self.time = (tile(self.time, [nights, 1]) +
                     (self.p * arange(nights))[:, newaxis]).ravel()
        self.npt = self.time.size
        self.tm.set_data(self.time)

        self.transit = zeros([self.npt, 4])
        for i, (ldc, c) in enumerate(zip(ldcs, self.contamination)):
            self.transit[:, i] = self.tm.evaluate_ps(self.k_true, ldc, 0,
                                                     self.p, self.a, self.i)
            self.transit[:, i] = c + (1 - c) * self.transit[:, i]

        # White noise
        # -----------
        if wnsigma is not None:
            self.wnoise = multivariate_normal(
                zeros(atleast_2d(self.transit).shape[1]),
                diag(wnsigma)**2, self.npt)
        else:
            self.wnoise = zeros_like(self.transit)

        # Red noise
        # ---------
        if rnsigma and with_george:
            self.gp = GP(rnsigma**2 * ExpKernel(rntscale))
            self.gp.compute(self.time)
            self.rnoise = self.gp.sample(self.time, self.npb).T
            self.rnoise -= self.rnoise.mean(0)
        else:
            self.rnoise = zeros_like(self.transit)

        # Final light curve
        # -----------------
        self.time_h = Qty(self.time, 'd').rescale('h')
        self.flux = self.transit + self.wnoise + self.rnoise
        return self.lcdataset

    @property
    def lcdataset(self):
        return LCDataSet([
            LCData(self.time, flux, pb)
            for pb, flux in zip(self.pb_names, self.flux.T)
        ], self.instrument)

    def plot(self, figsize=(13, 4), yoffset=0.01):
        fig, axs = pl.subplots(1,
                               3,
                               figsize=figsize,
                               sharex='all',
                               sharey='all')
        yshift = yoffset * arange(4)
        axs[0].plot(self.time_h, self.flux + yshift)
        axs[1].plot(self.time_h, self.transit + yshift)
        axs[2].plot(self.time_h, 1 + self.rnoise + yshift)
        pl.setp(axs, xlabel='Time [h]', xlim=self.time_h[[0, -1]])
        pl.setp(axs[0], ylabel='Normalised flux')
        [
            pl.setp(ax, title=title) for ax, title in zip(
                axs, 'Transit model + noise, Transit model, Red noise'.split(
                    ', '))
        ]
        fig.tight_layout()
        return fig, axs

    def plot_color_difference(self, figsize=(13, 4)):
        fig, axs = pl.subplots(2,
                               3,
                               figsize=figsize,
                               sharex='all',
                               sharey='all')
        [
            ax.plot(self.time_h, 100 * (fl - self.transit[:, -1]))
            for ax, fl in zip(axs[0], self.transit[:, :-1].T)
        ]
        [
            ax.plot(self.time_h, 100 * (fl - self.flux[:, -1]))
            for ax, fl in zip(axs[1], self.flux[:, :-1].T)
        ]
        [
            pl.setp(ax, title='F$_{}$ - F$_z$'.format(pb))
            for ax, pb in zip(axs[0], self.pb_names[:-1])
        ]
        pl.setp(axs[:, 0], ylabel='$\Delta F$ [%]')
        pl.setp(axs[1, :], xlabel='Time [h]')
        pl.setp(axs, xlim=self.time_h[[0, -1]])
        fig.tight_layout()
        return fig
コード例 #6
0
class MockLC:
    pb_names = 'g r i z'.split()
    pb_centers = 1e-9 * array([470, 640, 780, 900])
    npb = len(pb_names)

    def __init__(self, planet_name='wasp-80b', **kwargs):
        self.t_exposure_d = Qty(kwargs.get('exptime', 60), 's').rescale('d')
        self.t_baseline_d = Qty(kwargs.get('bltime', 0.5), 'h').rescale('d')
        self.ldcs = kwargs.get(
            'ldcs',
            array([[0.80, 0.02], [0.61, 0.16], [0.45, 0.20], [0.36, 0.20]]))

        self.filters = 'g r i z'.split()
        self.npb = len(self.filters)

        self.planet = planet = exocat.searchPlanet(planet_name)
        self.star = star = planet.star

        self.p = kwargs.get('p', None) or float(planet.P)
        self.k = kwargs.get('k', None) or float(
            planet.R.rescale('R_s') / star.R)
        self.a = kwargs.get('a', None) or float(
            planet.getParam('semimajoraxis').rescale('R_s') / star.R)
        self.i = float(planet.getParam('inclination').rescale('rad'))
        self.b = kwargs.get('b', self.a * cos(self.i))
        self.i = arccos(self.b / self.a)
        self.duration_d = Qty(
            of.duration_eccentric_f(self.p, self.k, self.a, self.i, 0, 0, 1),
            'd')

        # Contamination
        # -------------
        qe_be = TabulatedFilter('1024B_eXcelon', [
            300, 325, 350, 400, 450, 500, 700, 800, 850, 900, 950, 1050, 1150
        ], [
            0.0, 0.1, 0.25, 0.60, 0.85, 0.92, 0.96, 0.85, 0.70, 0.50, 0.30,
            0.05, 0.0
        ])
        qe_b = TabulatedFilter(
            '2014B', [300, 350, 500, 550, 700, 800, 1000, 1050],
            [0.10, 0.20, 0.90, 0.96, 0.90, 0.75, 0.11, 0.05])
        qes = qe_be, qe_b, qe_be, qe_be

        instrument = Instrument('MuSCAT2', (sdss_g, sdss_r, sdss_i, sdss_z),
                                qes)
        self.contaminator = SpectrumTool(instrument, "i'")

        self.i_contamination = kwargs.get('i_contamination', 0.0)
        self.cnteff = kwargs.get('contaminant_temperature', None) or float(
            star.T)
        self.k0 = self.k / np.sqrt(1 - self.i_contamination)
        self.contamination = self.contaminator.contamination(
            self.i_contamination, float(star.T), self.cnteff)

    @property
    def t_total_d(self):
        return self.duration_d + 2 * self.t_baseline_d

    @property
    def duration_h(self):
        return self.duration_d.rescale('h')

    @property
    def n_exp(self):
        return int(self.t_total_d // self.t_exposure_d)

    def __call__(self,
                 rseed=0,
                 ldcs=None,
                 wnsigma=None,
                 rnsigma=None,
                 rntscale=0.5):
        return self.create(rseed, ldcs, wnsigma, rnsigma, rntscale)

    def create(self,
               rseed=0,
               ldcs=None,
               wnsigma=None,
               rnsigma=None,
               rntscale=0.5,
               nights=1):
        ldcs = ldcs if ldcs is not None else self.ldcs
        seed(rseed)

        self.time = linspace(-0.5 * float(self.t_total_d),
                             0.5 * float(self.t_total_d), self.n_exp)
        self.time = (tile(self.time, [nights, 1]) +
                     (self.p * arange(nights))[:, newaxis]).ravel()
        self.npt = self.time.size

        self.transit = zeros([self.npt, 4])
        for i, (ldc, c) in enumerate(zip(ldcs, self.contamination)):
            self.transit[:, i] = MA().evaluate(self.time,
                                               self.k0,
                                               ldc,
                                               0,
                                               self.p,
                                               self.a,
                                               self.i,
                                               c=c)

        # White noise
        # -----------
        if wnsigma is not None:
            self.wnoise = multivariate_normal(
                zeros(atleast_2d(self.transit).shape[1]),
                diag(wnsigma)**2, self.npt)
        else:
            self.wnoise = zeros_like(self.transit)

        # Red noise
        # ---------
        if rnsigma and with_george:
            self.gp = GP(rnsigma**2 * ExpKernel(rntscale))
            self.gp.compute(self.time)
            self.rnoise = self.gp.sample(self.time, self.npb).T
            self.rnoise -= self.rnoise.mean(0)
        else:
            self.rnoise = zeros_like(self.transit)

        # Final light curve
        # -----------------
        self.time_h = Qty(self.time, 'd').rescale('h')
        self.flux = self.transit + self.wnoise + self.rnoise
        return self.time_h, self.flux

    def plot(self, figsize=(13, 4)):
        fig, axs = pl.subplots(1, 3, figsize=figsize, sharex=True, sharey=True)
        yshift = 0.01 * arange(4)
        axs[0].plot(self.time_h, self.flux + yshift)
        axs[1].plot(self.time_h, self.transit + yshift)
        axs[2].plot(self.time_h, 1 + self.rnoise + yshift)
        pl.setp(axs, xlabel='Time [h]', xlim=self.time_h[[0, -1]])
        pl.setp(axs[0], ylabel='Normalised flux')
        [
            pl.setp(ax, title=title) for ax, title in zip(
                axs, 'Transit model + noise, Transit model, Red noise'.split(
                    ', '))
        ]
        fig.tight_layout()
        return fig, axs

    def plot_color_difference(self, figsize=(13, 4)):
        fig, axs = pl.subplots(2, 3, figsize=figsize, sharex=True, sharey=True)
        [
            ax.plot(self.time_h, 100 * (fl - self.transit[:, -1]))
            for ax, fl in zip(axs[0], self.transit[:, :-1].T)
        ]
        [
            ax.plot(self.time_h, 100 * (fl - self.flux[:, -1]))
            for ax, fl in zip(axs[1], self.flux[:, :-1].T)
        ]
        [
            pl.setp(ax, title='F$_{}$ - F$_z$'.format(pb))
            for ax, pb in zip(axs[0], self.pb_names[:-1])
        ]
        pl.setp(axs[:, 0], ylabel='$\Delta F$ [%]')
        pl.setp(axs[1, :], xlabel='Time [h]')
        pl.setp(axs, xlim=self.time_h[[0, -1]])
        fig.tight_layout()
        return fig