Python sys.float_info方法代码示例

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def get_float(min_size=None, max_size=None):
    """
    return a random float
    sames as the random method but automatically sets min and max

    :param min_size: float, the minimum float size you want
    :param max_size: float, the maximum float size you want
    :returns: float, a random value between min_size and max_size
    """
    float_info = sys.float_info
    if min_size is None:
        min_size = float_info.min
    if max_size is None:
        max_size = float_info.max
    return random.uniform(min_size, max_size) 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def rank(self):
        ws = defaultdict(float)
        outSum = defaultdict(float)

        wsdef = 1.0 / (len(self.graph) or 1.0)
        for n, out in self.graph.items():
            ws[n] = wsdef
            outSum[n] = sum((e[2] for e in out), 0.0)

        # this line for build stable iteration
        sorted_keys = sorted(self.graph.keys())
        for x in xrange(10):  # 10 iters
            for n in sorted_keys:
                s = 0
                for e in self.graph[n]:
                    s += e[2] / outSum[e[1]] * ws[e[1]]
                ws[n] = (1 - self.d) + self.d * s

        (min_rank, max_rank) = (sys.float_info[0], sys.float_info[3])

        for w in itervalues(ws):
            if w < min_rank:
                min_rank = w
            if w > max_rank:
                max_rank = w

        for n, w in ws.items():
            # to unify the weights, don't *100.
            ws[n] = (w - min_rank / 10.0) / (max_rank - min_rank / 10.0)

        return ws 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def test_float_roundtrip(self):
        info = sys.float_info
        inf = float("inf")
        nan = float("nan")

        self.assertEqual(1.0, serialize.load(serialize.dump(1.0)))
        self.assertEqual(-1.0, serialize.load(serialize.dump(-1.0)))
        self.assertEqual(info.min, serialize.load(serialize.dump(info.min)))
        self.assertEqual(info.max, serialize.load(serialize.dump(info.max)))
        self.assertEqual(inf, serialize.load(serialize.dump(inf)))
        self.assertEqual(-inf, serialize.load(serialize.dump(-inf)))
        self.assertTrue(math.isnan(serialize.load(serialize.dump(nan)))) 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def sysmis(self):
        """This function returns the IBM SPSS Statistics system-missing
        value ($SYSMIS) for the host system (also called 'NA' in other
        systems)."""
        try:
            sysmis = -1 * sys.float_info[0]  # Python 2.6 and higher.
        except AttributeError:
            self.spssio.spssSysmisVal.restype = c_float
            sysmis = self.spssio.spssSysmisVal()
        return sysmis 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def test_float_info_tuple(self):
        self.assertEqual(tuple(sys.float_info), sys.float_info) 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def rank(self):
        ws = defaultdict(float)
        outSum = defaultdict(float)

        wsdef = 1.0 / (len(self.graph) or 1.0)
        for n, out in self.graph.items():
            ws[n] = wsdef
            outSum[n] = sum((e[2] for e in out), 0.0)

        # this line for build stable iteration
        sorted_keys = sorted(self.graph.keys())
        for x in xrange(10):  # 10 iters
            for n in sorted_keys:
                s = 0
                for e in self.graph[n]:
                    s += e[2] / outSum[e[1]] * ws[e[1]]
                ws[n] = (1 - self.d) + self.d * s

        (min_rank, max_rank) = (sys.float_info[0], sys.float_info[3])

        for w in itervalues(ws):
            if w < min_rank:
                min_rank = w
            elif w > max_rank:
                max_rank = w

        for n, w in ws.items():
            # to unify the weights, don't *100.
            ws[n] = (w - min_rank / 10.0) / (max_rank - min_rank / 10.0)

        return ws 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def test_indexer_records_import_of_variable(self):
		client = self.indexSourceCode(
			'from sys import float_info\n'
		)
		self.assertTrue('USAGE: virtual_file -> sys at [1:6|1:8]' in client.references)
		self.assertTrue('IMPORT: virtual_file -> sys.float_info at [1:17|1:26]' in client.references) 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def test_indexer_records_import_of_aliased_variable(self):
		client = self.indexSourceCode(
			'from sys import float_info as FI\n'
		)
		self.assertTrue('USAGE: virtual_file -> sys at [1:6|1:8]' in client.references)
		self.assertTrue('IMPORT: virtual_file -> sys.float_info at [1:17|1:26]' in client.references)
		self.assertTrue('IMPORT: virtual_file -> sys.float_info at [1:31|1:32]' in client.references) 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def test_indexer_records_import_of_multiple_aliased_variables_with_single_import_statement(self):
		client = self.indexSourceCode(
			'from sys import float_info as FI, api_version as AI\n'
		)
		self.assertTrue('USAGE: virtual_file -> sys at [1:6|1:8]' in client.references)
		self.assertTrue('IMPORT: virtual_file -> sys.float_info at [1:17|1:26]' in client.references)
		self.assertTrue('IMPORT: virtual_file -> sys.float_info at [1:31|1:32]' in client.references)
		self.assertTrue('IMPORT: virtual_file -> sys.api_version at [1:35|1:45]' in client.references)
		self.assertTrue('IMPORT: virtual_file -> sys.api_version at [1:50|1:51]' in client.references) 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def gaussPDF(Data, Mu, Sigma):
    realmin = sys.float_info[3]
    nbVar, nbData = np.shape(Data)
    Data = np.transpose(Data) - np.tile(np.transpose(Mu), (nbData, 1))
    prob = np.sum(np.dot(Data, np.linalg.inv(Sigma))*Data, 1)
    prob = np.exp(-0.5*prob)/np.sqrt((np.power((2*math.pi), nbVar))*np.absolute(np.linalg.det(Sigma))+realmin)
    return prob 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def test_attributes(self):
        self.assertIsInstance(sys.api_version, int)
        self.assertIsInstance(sys.argv, list)
        self.assertIn(sys.byteorder, ("little", "big"))
        self.assertIsInstance(sys.builtin_module_names, tuple)
        self.assertIsInstance(sys.copyright, basestring)
        self.assertIsInstance(sys.exec_prefix, basestring)
        self.assertIsInstance(sys.executable, basestring)
        self.assertEqual(len(sys.float_info), 11)
        self.assertEqual(sys.float_info.radix, 2)
        self.assertEqual(len(sys.long_info), 2)
        if sys.platform != 'cli':
            self.assertTrue(sys.long_info.bits_per_digit % 5 == 0)
        else:
            self.assertTrue(sys.long_info.bits_per_digit % 8 == 0)
        self.assertTrue(sys.long_info.sizeof_digit >= 1)
        self.assertEqual(type(sys.long_info.bits_per_digit), int)
        self.assertEqual(type(sys.long_info.sizeof_digit), int)
        self.assertIsInstance(sys.hexversion, int)
        self.assertIsInstance(sys.maxint, int)
        if test.test_support.have_unicode:
            self.assertIsInstance(sys.maxunicode, int)
        self.assertIsInstance(sys.platform, basestring)
        self.assertIsInstance(sys.prefix, basestring)
        self.assertIsInstance(sys.version, basestring)
        vi = sys.version_info
        self.assertIsInstance(vi[:], tuple)
        self.assertEqual(len(vi), 5)
        self.assertIsInstance(vi[0], int)
        self.assertIsInstance(vi[1], int)
        self.assertIsInstance(vi[2], int)
        self.assertIn(vi[3], ("alpha", "beta", "candidate", "final"))
        self.assertIsInstance(vi[4], int)
        self.assertIsInstance(vi.major, int)
        self.assertIsInstance(vi.minor, int)
        self.assertIsInstance(vi.micro, int)
        self.assertIn(vi.releaselevel, ("alpha", "beta", "candidate", "final"))
        self.assertIsInstance(vi.serial, int)
        self.assertEqual(vi[0], vi.major)
        self.assertEqual(vi[1], vi.minor)
        self.assertEqual(vi[2], vi.micro)
        self.assertEqual(vi[3], vi.releaselevel)
        self.assertEqual(vi[4], vi.serial)
        self.assertTrue(vi > (1,0,0))
        self.assertIsInstance(sys.float_repr_style, str)
        self.assertIn(sys.float_repr_style, ('short', 'legacy')) 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def test_attributes(self):
        self.assertIsInstance(sys.api_version, int)
        self.assertIsInstance(sys.argv, list)
        self.assertIn(sys.byteorder, ("little", "big"))
        self.assertIsInstance(sys.builtin_module_names, tuple)
        self.assertIsInstance(sys.copyright, basestring)
        self.assertIsInstance(sys.exec_prefix, basestring)
        self.assertIsInstance(sys.executable, basestring)
        self.assertEqual(len(sys.float_info), 11)
        self.assertEqual(sys.float_info.radix, 2)
        self.assertEqual(len(sys.long_info), 2)
        self.assertTrue(sys.long_info.bits_per_digit % 5 == 0)
        self.assertTrue(sys.long_info.sizeof_digit >= 1)
        self.assertEqual(type(sys.long_info.bits_per_digit), int)
        self.assertEqual(type(sys.long_info.sizeof_digit), int)
        self.assertIsInstance(sys.hexversion, int)
        self.assertIsInstance(sys.maxint, int)
        if test.test_support.have_unicode:
            self.assertIsInstance(sys.maxunicode, int)
        self.assertIsInstance(sys.platform, basestring)
        self.assertIsInstance(sys.prefix, basestring)
        self.assertIsInstance(sys.version, basestring)
        vi = sys.version_info
        self.assertIsInstance(vi[:], tuple)
        self.assertEqual(len(vi), 5)
        self.assertIsInstance(vi[0], int)
        self.assertIsInstance(vi[1], int)
        self.assertIsInstance(vi[2], int)
        self.assertIn(vi[3], ("alpha", "beta", "candidate", "final"))
        self.assertIsInstance(vi[4], int)
        self.assertIsInstance(vi.major, int)
        self.assertIsInstance(vi.minor, int)
        self.assertIsInstance(vi.micro, int)
        self.assertIn(vi.releaselevel, ("alpha", "beta", "candidate", "final"))
        self.assertIsInstance(vi.serial, int)
        self.assertEqual(vi[0], vi.major)
        self.assertEqual(vi[1], vi.minor)
        self.assertEqual(vi[2], vi.micro)
        self.assertEqual(vi[3], vi.releaselevel)
        self.assertEqual(vi[4], vi.serial)
        self.assertTrue(vi > (1,0,0))
        self.assertIsInstance(sys.float_repr_style, str)
        self.assertIn(sys.float_repr_style, ('short', 'legacy')) 

# 需要导入模块: import sys [as 别名]
# 或者: from sys import float_info [as 别名]
def EM(Data, Priors0, Mu0, Sigma0):
    realmax = sys.float_info[0]
    realmin = sys.float_info[3]
    loglik_threshold = 1e-10
    nbVar, nbData = np.shape(Data)
    nbStates = np.size(Priors0)
    loglik_old = -realmax
    nbStep = 0
    Mu = Mu0
    Sigma = Sigma0
    Priors = Priors0

    Pix = np.ndarray(shape = (nbStates, nbData))
    Pxi = np.ndarray(shape = (nbData, nbStates))
    while 1:
        for i in range (0,nbStates):
            Pxi[:,i] = gaussPDF(Data,Mu[:,i],Sigma[:,:,i])

        Pix_tmp = np.multiply(np.tile(Priors, (nbData, 1)),Pxi)
        Pix = np.divide(Pix_tmp,np.tile(np.reshape(np.sum(Pix_tmp,1), (nbData, 1)), (1, nbStates)))
        E = np.sum(Pix, 0)
        Priors = np.reshape(Priors, (nbStates))
        for i in range (0,nbStates):
            Priors[i] = E[i]/nbData
            Mu[:,i] = np.dot(Data,Pix[:,i])/E[i]
            Data_tmp1 = Data - np.tile(np.reshape(Mu[:,i], (nbVar, 1)), (1,nbData))
            a = np.transpose(Pix[:, i])
            b = np.reshape(a, (1, nbData))
            c = np.tile(b, (nbVar, 1))
            d = c*Data_tmp1
            e = np.transpose(Data_tmp1)
            f = np.dot(d,e)
            Sigma[:,:,i] = f/E[i]
            Sigma[:,:,i] = Sigma[:,:,i] + 0.00001 * np.diag(np.diag(np.ones((nbVar,nbVar))))

        for i in range (0,nbStates):
            Pxi[:,i] = gaussPDF(Data,Mu[:,i],Sigma[:,:,i])
        F = np.dot(Pxi,np.transpose(Priors))
        indexes = np.nonzero(F<realmin)
        indexes = list(indexes)
        indexes = np.reshape(indexes,np.size(indexes))
        F[indexes] = realmin
        F = np.reshape(F, (nbData, 1))
        loglik = np.mean(np.log10(F), 0)
        if np.absolute((loglik/loglik_old)-1)<loglik_threshold:
            break
        loglik_old = loglik
        nbStep = nbStep+1
    return(Priors,Mu,Sigma, Pix)