Python torch.linspace方法代碼示例

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def _fade_in(self, waveform_length: int) -> Tensor:
        fade = torch.linspace(0, 1, self.fade_in_len)
        ones = torch.ones(waveform_length - self.fade_in_len)

        if self.fade_shape == "linear":
            fade = fade

        if self.fade_shape == "exponential":
            fade = torch.pow(2, (fade - 1)) * fade

        if self.fade_shape == "logarithmic":
            fade = torch.log10(.1 + fade) + 1

        if self.fade_shape == "quarter_sine":
            fade = torch.sin(fade * math.pi / 2)

        if self.fade_shape == "half_sine":
            fade = torch.sin(fade * math.pi - math.pi / 2) / 2 + 0.5

        return torch.cat((fade, ones)).clamp_(0, 1) 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def _fade_out(self, waveform_length: int) -> Tensor:
        fade = torch.linspace(0, 1, self.fade_out_len)
        ones = torch.ones(waveform_length - self.fade_out_len)

        if self.fade_shape == "linear":
            fade = - fade + 1

        if self.fade_shape == "exponential":
            fade = torch.pow(2, - fade) * (1 - fade)

        if self.fade_shape == "logarithmic":
            fade = torch.log10(1.1 - fade) + 1

        if self.fade_shape == "quarter_sine":
            fade = torch.sin(fade * math.pi / 2 + math.pi / 2)

        if self.fade_shape == "half_sine":
            fade = torch.sin(fade * math.pi + math.pi / 2) / 2 + 0.5

        return torch.cat((ones, fade)).clamp_(0, 1) 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def backwarp(tenInput, tenFlow):
	if str(tenFlow.size()) not in backwarp_tenGrid:
		tenHorizontal = torch.linspace(-1.0, 1.0, tenFlow.shape[3]).view(1, 1, 1, tenFlow.shape[3]).expand(tenFlow.shape[0], -1, tenFlow.shape[2], -1)
		tenVertical = torch.linspace(-1.0, 1.0, tenFlow.shape[2]).view(1, 1, tenFlow.shape[2], 1).expand(tenFlow.shape[0], -1, -1, tenFlow.shape[3])

		backwarp_tenGrid[str(tenFlow.size())] = torch.cat([ tenHorizontal, tenVertical ], 1).cuda()
	# end

	if str(tenFlow.size()) not in backwarp_tenPartial:
		backwarp_tenPartial[str(tenFlow.size())] = tenFlow.new_ones([ tenFlow.shape[0], 1, tenFlow.shape[2], tenFlow.shape[3] ])
	# end

	tenFlow = torch.cat([ tenFlow[:, 0:1, :, :] / ((tenInput.shape[3] - 1.0) / 2.0), tenFlow[:, 1:2, :, :] / ((tenInput.shape[2] - 1.0) / 2.0) ], 1)
	tenInput = torch.cat([ tenInput, backwarp_tenPartial[str(tenFlow.size())] ], 1)

	tenOutput = torch.nn.functional.grid_sample(input=tenInput, grid=(backwarp_tenGrid[str(tenFlow.size())] + tenFlow).permute(0, 2, 3, 1), mode='bilinear', padding_mode='zeros', align_corners=True)

	tenMask = tenOutput[:, -1:, :, :]; tenMask[tenMask > 0.999] = 1.0; tenMask[tenMask < 1.0] = 0.0

	return tenOutput[:, :-1, :, :] * tenMask
# end

########################################################## 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def test_geodesic_segment_length_property(a, b, manifold, dtype):
    extra_dims = len(a.shape)
    segments = 12
    t = torch.linspace(0, 1, segments + 1, dtype=dtype).view(
        (segments + 1,) + (1,) * extra_dims
    )
    gamma_ab_t = manifold.geodesic(t, a, b)
    gamma_ab_t0 = gamma_ab_t[:-1]
    gamma_ab_t1 = gamma_ab_t[1:]
    dist_ab_t0mt1 = manifold.dist(gamma_ab_t0, gamma_ab_t1, keepdim=True)
    speed = manifold.dist(a, b, keepdim=True).unsqueeze(0).expand_as(dist_ab_t0mt1)
    # we have exactly 12 line segments
    tolerance = {
        torch.float32: dict(rtol=1e-5, atol=5e-3),
        torch.float64: dict(rtol=1e-5, atol=5e-3),
    }
    length = speed / segments
    np.testing.assert_allclose(
        dist_ab_t0mt1.detach(), length.detach(), **tolerance[dtype]
    )
    (length + dist_ab_t0mt1).sum().backward()
    assert torch.isfinite(a.grad).all()
    assert torch.isfinite(b.grad).all()
    assert torch.isfinite(manifold.k.grad).all() 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def test_geodesic_segement_unit_property(a, b, manifold, dtype):
    extra_dims = len(a.shape)
    segments = 12
    t = torch.linspace(0, 1, segments + 1, dtype=dtype).view(
        (segments + 1,) + (1,) * extra_dims
    )
    gamma_ab_t = manifold.geodesic_unit(t, a, b)
    gamma_ab_t0 = gamma_ab_t[:1]
    gamma_ab_t1 = gamma_ab_t
    dist_ab_t0mt1 = manifold.dist(gamma_ab_t0, gamma_ab_t1, keepdim=True)
    true_distance_travelled = t.expand_as(dist_ab_t0mt1)
    # we have exactly 12 line segments
    tolerance = {
        torch.float32: dict(atol=2e-4, rtol=5e-5),
        torch.float64: dict(atol=1e-10),
    }
    np.testing.assert_allclose(
        dist_ab_t0mt1.detach(), true_distance_travelled.detach(), **tolerance[dtype]
    )
    (true_distance_travelled + dist_ab_t0mt1).sum().backward()
    assert torch.isfinite(a.grad).all()
    assert torch.isfinite(b.grad).all()
    assert torch.isfinite(manifold.k.grad).all() 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def imwrap_BCHW0(im_src, disp):
    # imwrap
    bn, c, h, w = im_src.shape
    row = torch.linspace(-1, 1, w)
    col = torch.linspace(-1, 1, h)
    grid = torch.zeros(bn, h, w, 2)
    for n in range(bn):
        for i in range(h):
            grid[n, i, :, 0] = row
        for i in range(w):
            grid[n, :, i, 1] = col
    grid = Variable(grid, requires_grad=True).type_as(im_src)
    grid[:, :, :, 0] = grid[:, :, :, 0] - disp.squeeze(1)*2/w
    #print disp[-1, -1, -1], grid[-1, -1, -1, 0]
    im_src.clamp(min=1e-6)
    im_wrap = F.grid_sample(im_src, grid)
    return im_wrap 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def _init_buffers(self):
        m_min = 0. if self.f_min == 0 else 2595 * np.log10(1. + (self.f_min / 700))
        m_max = 2595 * np.log10(1. + (self.f_max / 700))

        m_pts = torch.linspace(m_min, m_max, self.n_mels + 2)
        f_pts = (700 * (10**(m_pts / 2595) - 1))

        bins = torch.floor(((self.n_fft - 1) * 2) * f_pts / self.sr).long()

        fb = torch.zeros(self.n_fft, self.n_mels)
        for m in range(1, self.n_mels + 1):
            f_m_minus = bins[m - 1].item()
            f_m = bins[m].item()
            f_m_plus = bins[m + 1].item()

            if f_m_minus != f_m:
                fb[f_m_minus:f_m, m - 1] = (torch.arange(f_m_minus, f_m) - f_m_minus) / (f_m - f_m_minus)
            if f_m != f_m_plus:
                fb[f_m:f_m_plus, m - 1] = (f_m_plus - torch.arange(f_m, f_m_plus)) / (f_m_plus - f_m)
        self.register_buffer("fb", fb) 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def __init__(self, max_disp, start_disp=0, dilation=1, alpha=1.0, normalize=True):
        super(FasterSoftArgmin, self).__init__()
        self.max_disp = max_disp
        self.start_disp = start_disp
        self.dilation = dilation
        self.end_disp = start_disp + max_disp - 1
        self.disp_sample_number = (max_disp + dilation - 1) // dilation

        self.alpha = alpha
        self.normalize = normalize

        # compute disparity index: (1 ,1, disp_sample_number, 1, 1)
        disp_sample = torch.linspace(
            self.start_disp, self.end_disp, self.disp_sample_number
        )
        disp_sample = disp_sample.repeat(1, 1, 1, 1, 1).permute(0, 1, 4, 2, 3).contiguous()

        self.disp_regression = nn.Conv3d(1, 1, (self.disp_sample_number, 1, 1), 1, 0, bias=False)

        self.disp_regression.weight.data = disp_sample
        self.disp_regression.weight.requires_grad = False 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def test_speed(self):
        max_disp = 192
        scale = 4
        start_disp = 0
        dilation = 1
        SH, SW = 540, 960
        B, C, H, W = 1, 32, SH//scale, SW//scale

        reference_fm = torch.rand(B, C, H, W).to(self.device)
        target_fm = torch.rand(B, C, H, W).to(self.device)

        self.timeTemplate(cat_fms, 'CAT_FMS', reference_fm, target_fm, max_disp//scale, start_disp, dilation)

        self.timeTemplate(fast_cat_fms, 'FAST_CAT_FMS', reference_fm, target_fm, max_disp//scale, start_disp, dilation)

        print('Test fast_cat_fms with disparity samples')

        d = (max_disp + dilation - 1) // dilation
        end_disp = start_disp + max_disp - 1

        # generate disparity samples
        disp_samples = torch.linspace(start_disp, end_disp, d).repeat(1, H, W, 1). \
            permute(0, 3, 1, 2).contiguous().to(self.device)

        self.timeTemplate(fast_cat_fms, 'FAST_CAT_FMS', reference_fm, target_fm, max_disp//scale, start_disp, dilation, disp_samples) 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def _sample_ortho_batch(self, mu, dim):
        """

        :param mu: Variable, [batch size, latent dim]
        :param dim: scala. =latent dim
        :return:
        """
        _batch_sz, _lat_dim = mu.size()
        assert _lat_dim == dim
        squeezed_mu = mu.unsqueeze(1)

        v = GVar(torch.randn(_batch_sz, dim, 1))  # TODO random

        # v = GVar(torch.linspace(-1, 1, steps=dim))
        # v = v.expand(_batch_sz, dim).unsqueeze(2)

        rescale_val = torch.bmm(squeezed_mu, v).squeeze(2)
        proj_mu_v = mu * rescale_val
        ortho = v.squeeze() - proj_mu_v
        ortho_norm = torch.norm(ortho, p=2, dim=1, keepdim=True)
        y = ortho / ortho_norm
        return y 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def _sample_orthonormal_to(self, mu, dim):
        """Sample point on sphere orthogonal to mu.
        """
        v = GVar(torch.randn(dim))  # TODO random

        # v = GVar(torch.linspace(-1,1,steps=dim))

        rescale_value = mu.dot(v) / mu.norm()
        proj_mu_v = mu * rescale_value.expand(dim)
        ortho = v - proj_mu_v
        ortho_norm = torch.norm(ortho)
        return ortho / ortho_norm.expand_as(ortho)


#
# a = torch.tensor(10)
# b = torch.ones(1, dtype=torch.float, requires_grad=True)
#
# y = bessel(a, b)
# loss = 1 - y
# print(y)
# loss.backward()
# print(a) 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def _sample_orthonormal_to(self, mu, dim):
        """Sample point on sphere orthogonal to mu.
        """
        v = GVar(torch.randn(dim))  # TODO random

        # v = GVar(torch.linspace(-1,1,steps=dim))

        rescale_value = mu.dot(v) / mu.norm()
        proj_mu_v = mu * rescale_value.expand(dim)
        ortho = v - proj_mu_v
        ortho_norm = torch.norm(ortho)
        return ortho / ortho_norm.expand_as(ortho)

# vmf = vMF_fast(50, 100, 100)
# batchsz = 100
#
# mu = torch.FloatTensor(np.random.uniform(0, 1, 20 * batchsz))
# mu = mu.view(batchsz, -1)
# mu = mu / torch.norm(mu, p=2, dim=1, keepdim=True)
# vmf.sample_cell(mu, None, 100)
# x = vMF(10,lat_dim=50,kappa=50) 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def forward(self, image, flow):
        flow_for_grip = torch.zeros_like(flow)
        flow_for_grip[:,0,:,:] = flow[:,0,:,:] / ((flow.size(3) - 1.0) / 2.0)
        flow_for_grip[:,1,:,:] = flow[:,1,:,:] / ((flow.size(2) - 1.0) / 2.0)

        torchHorizontal = torch.linspace(
            -1.0, 1.0, image.size(3)).view(
            1, 1, 1, image.size(3)).expand(
            image.size(0), 1, image.size(2), image.size(3))
        torchVertical = torch.linspace(
            -1.0, 1.0, image.size(2)).view(
            1, 1, image.size(2), 1).expand(
            image.size(0), 1, image.size(2), image.size(3))
        grid = torch.cat([torchHorizontal, torchVertical], 1).cuda()

        grid = (grid + flow_for_grip).permute(0, 2, 3, 1)
        return torch.nn.functional.grid_sample(image, grid) 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def __init__(self, N_filt,Filt_dim,fs, stride=1, padding=0, is_cuda=False):
		super(SincLayer,self).__init__()

		# Mel Initialization of the filterbanks
		low_freq_mel = 80
		high_freq_mel = (2595 * np.log10(1 + (fs / 2) / 700))  # Convert Hz to Mel
		mel_points = np.linspace(low_freq_mel, high_freq_mel, N_filt)  # Equally spaced in Mel scale
		f_cos = (700 * (10**(mel_points / 2595) - 1)) # Convert Mel to Hz
		b1=np.roll(f_cos,1)
		b2=np.roll(f_cos,-1)
		b1[0]=30
		b2[-1]=(fs/2)-100

		self.freq_scale=fs*1.0
		self.filt_b1 = torch.nn.Parameter(torch.from_numpy(b1/self.freq_scale))
		self.filt_band = torch.nn.Parameter(torch.from_numpy((b2-b1)/self.freq_scale))

		self.N_filt=N_filt
		self.Filt_dim=Filt_dim
		self.fs=fs
		self.stride=stride
		self.padding=padding
		self.is_cuda = is_cuda 

# 需要導入模塊: import torch [as 別名]
# 或者: from torch import linspace [as 別名]
def uniform_grid(shape):
    '''Uniformly places control points aranged in grid accross normalized image coordinates.
    
    Params
    ------
    shape : tuple
        HxW defining the number of control points in height and width dimension

    Returns
    -------
    points: HxWx2 tensor
        Control points over [0,1] normalized image range.
    '''
    H,W = shape[:2]    
    c = torch.zeros(H, W, 2)
    c[..., 0] = torch.linspace(0, 1, W)
    c[..., 1] = torch.linspace(0, 1, H).unsqueeze(-1)
    return c