viz/renderer.py

# Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
#
# NVIDIA CORPORATION and its licensors retain all intellectual property
# and proprietary rights in and to this software, related documentation
# and any modifications thereto.  Any use, reproduction, disclosure or
# distribution of this software and related documentation without an express
# license agreement from NVIDIA CORPORATION is strictly prohibited.

from socket import has_dualstack_ipv6
import sys
import copy
import traceback
import math
import numpy as np
from PIL import Image, ImageDraw, ImageFont
import torch
import torch.fft
import torch.nn as nn
import torch.nn.functional as F
import matplotlib.cm
import dnnlib
from torch_utils.ops import upfirdn2d
import legacy  # pylint: disable=import-error

# ----------------------------------------------------------------------------


class CapturedException(Exception):
    def __init__(self, msg=None):
        if msg is None:
            _type, value, _traceback = sys.exc_info()
            assert value is not None
            if isinstance(value, CapturedException):
                msg = str(value)
            else:
                msg = traceback.format_exc()
        assert isinstance(msg, str)
        super().__init__(msg)

# ----------------------------------------------------------------------------


class CaptureSuccess(Exception):
    def __init__(self, out):
        super().__init__()
        self.out = out

# ----------------------------------------------------------------------------


def add_watermark_np(input_image_array, watermark_text="AI Generated"):
    image = Image.fromarray(np.uint8(input_image_array)).convert("RGBA")

    # Initialize text image
    txt = Image.new('RGBA', image.size, (255, 255, 255, 0))
    font = ImageFont.truetype('arial.ttf', round(25/512*image.size[0]))
    d = ImageDraw.Draw(txt)

    text_width, text_height = font.getsize(watermark_text)
    text_position = (image.size[0] - text_width -
                     10, image.size[1] - text_height - 10)
    # white color with the alpha channel set to semi-transparent
    text_color = (255, 255, 255, 128)

    # Draw the text onto the text canvas
    d.text(text_position, watermark_text, font=font, fill=text_color)

    # Combine the image with the watermark
    watermarked = Image.alpha_composite(image, txt)
    watermarked_array = np.array(watermarked)
    return watermarked_array

# ----------------------------------------------------------------------------


class Renderer:
    def __init__(self, disable_timing=False):
        self._device = torch.device('cuda' if torch.cuda.is_available(
        ) else 'mps' if torch.backends.mps.is_available() else 'cpu')
        self._dtype = torch.float32 if self._device.type == 'mps' else torch.float64
        self._pkl_data = dict()    # {pkl: dict | CapturedException, ...}
        self._networks = dict()    # {cache_key: torch.nn.Module, ...}
        self._pinned_bufs = dict()    # {(shape, dtype): torch.Tensor, ...}
        self._cmaps = dict()    # {name: torch.Tensor, ...}
        self._is_timing = False
        if not disable_timing:
            self._start_event = torch.cuda.Event(enable_timing=True)
            self._end_event = torch.cuda.Event(enable_timing=True)
        self._disable_timing = disable_timing
        self._net_layers = dict()    # {cache_key: [dnnlib.EasyDict, ...], ...}

    def render(self, **args):
        if self._disable_timing:
            self._is_timing = False
        else:
            self._start_event.record(torch.cuda.current_stream(self._device))
            self._is_timing = True
        res = dnnlib.EasyDict()
        try:
            init_net = False
            if not hasattr(self, 'G'):
                init_net = True
            if hasattr(self, 'pkl'):
                if self.pkl != args['pkl']:
                    init_net = True
            if hasattr(self, 'w_load'):
                if self.w_load is not args['w_load']:
                    init_net = True
            if hasattr(self, 'w0_seed'):
                if self.w0_seed != args['w0_seed']:
                    init_net = True
            if hasattr(self, 'w_plus'):
                if self.w_plus != args['w_plus']:
                    init_net = True
            if args['reset_w']:
                init_net = True
            res.init_net = init_net
            if init_net:
                self.init_network(res, **args)
            self._render_drag_impl(res, **args)
        except:
            res.error = CapturedException()
        if not self._disable_timing:
            self._end_event.record(torch.cuda.current_stream(self._device))
        if 'image' in res:
            res.image = self.to_cpu(res.image).detach().numpy()
            res.image = add_watermark_np(res.image, 'AI Generated')
        if 'stats' in res:
            res.stats = self.to_cpu(res.stats).detach().numpy()
        if 'error' in res:
            res.error = str(res.error)
        # if 'stop' in res and res.stop:

        if self._is_timing and not self._disable_timing:
            self._end_event.synchronize()
            res.render_time = self._start_event.elapsed_time(
                self._end_event) * 1e-3
            self._is_timing = False
        return res

    def get_network(self, pkl, key, **tweak_kwargs):
        data = self._pkl_data.get(pkl, None)
        if data is None:
            print(f'Loading "{pkl}"... ', end='', flush=True)
            try:
                with dnnlib.util.open_url(pkl, verbose=False) as f:
                    data = legacy.load_network_pkl(f)
                print('Done.')
            except:
                data = CapturedException()
                print('Failed!')
            self._pkl_data[pkl] = data
            self._ignore_timing()
        if isinstance(data, CapturedException):
            raise data

        orig_net = data[key]
        cache_key = (orig_net, self._device, tuple(
            sorted(tweak_kwargs.items())))
        net = self._networks.get(cache_key, None)
        if net is None:
            try:
                if 'stylegan2' in pkl:
                    from training.networks_stylegan2 import Generator
                elif 'stylegan3' in pkl:
                    from training.networks_stylegan3 import Generator
                elif 'stylegan_human' in pkl:
                    from stylegan_human.training_scripts.sg2.training.networks import Generator
                else:
                    raise NameError('Cannot infer model type from pkl name!')

                print(data[key].init_args)
                print(data[key].init_kwargs)
                if 'stylegan_human' in pkl:
                    net = Generator(
                        *data[key].init_args, **data[key].init_kwargs, square=False, padding=True)
                else:
                    net = Generator(*data[key].init_args,
                                    **data[key].init_kwargs)
                net.load_state_dict(data[key].state_dict())
                net.to(self._device)
            except:
                net = CapturedException()
            self._networks[cache_key] = net
            self._ignore_timing()
        if isinstance(net, CapturedException):
            raise net
        return net

    def _get_pinned_buf(self, ref):
        key = (tuple(ref.shape), ref.dtype)
        buf = self._pinned_bufs.get(key, None)
        if buf is None:
            buf = torch.empty(ref.shape, dtype=ref.dtype).pin_memory()
            self._pinned_bufs[key] = buf
        return buf

    def to_device(self, buf):
        return self._get_pinned_buf(buf).copy_(buf).to(self._device)

    def to_cpu(self, buf):
        return self._get_pinned_buf(buf).copy_(buf).clone()

    def _ignore_timing(self):
        self._is_timing = False

    def _apply_cmap(self, x, name='viridis'):
        cmap = self._cmaps.get(name, None)
        if cmap is None:
            cmap = matplotlib.cm.get_cmap(name)
            cmap = cmap(np.linspace(0, 1, num=1024), bytes=True)[:, :3]
            cmap = self.to_device(torch.from_numpy(cmap))
            self._cmaps[name] = cmap
        hi = cmap.shape[0] - 1
        x = (x * hi + 0.5).clamp(0, hi).to(torch.int64)
        x = torch.nn.functional.embedding(x, cmap)
        return x

    def init_network(self, res,
                     pkl=None,
                     w0_seed=0,
                     w_load=None,
                     w_plus=True,
                     noise_mode='const',
                     trunc_psi=0.7,
                     trunc_cutoff=None,
                     input_transform=None,
                     lr=0.001,
                     **kwargs
                     ):
        # Dig up network details.
        self.pkl = pkl
        G = self.get_network(pkl, 'G_ema')
        self.G = G
        res.img_resolution = G.img_resolution
        res.num_ws = G.num_ws
        res.has_noise = any('noise_const' in name for name,
                            _buf in G.synthesis.named_buffers())
        res.has_input_transform = (
            hasattr(G.synthesis, 'input') and hasattr(G.synthesis.input, 'transform'))
        res.stop = False
        # Set input transform.
        if res.has_input_transform:
            m = np.eye(3)
            try:
                if input_transform is not None:
                    m = np.linalg.inv(np.asarray(input_transform))
            except np.linalg.LinAlgError:
                res.error = CapturedException()
            G.synthesis.input.transform.copy_(torch.from_numpy(m))

        # Generate random latents.
        self.w0_seed = w0_seed
        self.w_load = w_load

        if self.w_load is None:
            # Generate random latents.
            z = torch.from_numpy(np.random.RandomState(w0_seed).randn(
                1, 512)).to(self._device, dtype=self._dtype)

            # Run mapping network.
            label = torch.zeros([1, G.c_dim], device=self._device)
            w = G.mapping(z, label, truncation_psi=trunc_psi,
                          truncation_cutoff=trunc_cutoff)
        else:
            w = self.w_load.clone().to(self._device)

        self.w0 = w.detach().clone()
        self.w_plus = w_plus
        if w_plus:
            self.w = w.detach()
        else:
            self.w = w[:, 0, :].detach()
        self.w.requires_grad = True
        self.w_optim = torch.optim.Adam([self.w], lr=lr)

        self.feat_refs = None
        self.points0_pt = None

    def update_lr(self, lr):

        del self.w_optim
        self.w_optim = torch.optim.Adam([self.w], lr=lr)
        print(f'Rebuild optimizer with lr: {lr}')
        print('    Remain feat_refs and points0_pt')

    def _render_drag_impl(self, res,
                          points=[],
                          targets=[],
                          mask=None,
                          lambda_mask=10,
                          reg=0,
                          feature_idx=5,
                          r1=3,
                          r2=12,
                          random_seed=0,
                          noise_mode='const',
                          trunc_psi=0.7,
                          force_fp32=False,
                          layer_name=None,
                          sel_channels=3,
                          base_channel=0,
                          img_scale_db=0,
                          img_normalize=False,
                          untransform=False,
                          is_drag=False,
                          reset=False,
                          to_pil=False,
                          **kwargs
                          ):
        try:
            G = self.G
            ws = self.w
            if ws.dim() == 2:
                ws = ws.unsqueeze(1).repeat(1, 6, 1)
            ws = torch.cat([ws[:, :6, :], self.w0[:, 6:, :]], dim=1)
            if hasattr(self, 'points'):
                if len(points) != len(self.points):
                    reset = True
            if reset:
                self.feat_refs = None
                self.points0_pt = None
            self.points = points

            # Run synthesis network.
            label = torch.zeros([1, G.c_dim], device=self._device)
            img, feat = G(ws, label, truncation_psi=trunc_psi,
                          noise_mode=noise_mode, input_is_w=True, return_feature=True)

            h, w = G.img_resolution, G.img_resolution

            if is_drag:
                X = torch.linspace(0, h, h)
                Y = torch.linspace(0, w, w)
                xx, yy = torch.meshgrid(X, Y)
                feat_resize = F.interpolate(
                    feat[feature_idx], [h, w], mode='bilinear')
                if self.feat_refs is None:
                    self.feat0_resize = F.interpolate(
                        feat[feature_idx].detach(), [h, w], mode='bilinear')
                    self.feat_refs = []
                    for point in points:
                        py, px = round(point[0]), round(point[1])
                        self.feat_refs.append(self.feat0_resize[:, :, py, px])
                    self.points0_pt = torch.Tensor(points).unsqueeze(
                        0).to(self._device)  # 1, N, 2

                # Point tracking with feature matching
                with torch.no_grad():
                    for j, point in enumerate(points):
                        r = round(r2 / 512 * h)
                        up = max(point[0] - r, 0)
                        down = min(point[0] + r + 1, h)
                        left = max(point[1] - r, 0)
                        right = min(point[1] + r + 1, w)
                        feat_patch = feat_resize[:, :, up:down, left:right]
                        L2 = torch.linalg.norm(
                            feat_patch - self.feat_refs[j].reshape(1, -1, 1, 1), dim=1)
                        _, idx = torch.min(L2.view(1, -1), -1)
                        width = right - left
                        point = [idx.item() // width + up, idx.item() %
                                 width + left]
                        points[j] = point

                res.points = [[point[0], point[1]] for point in points]

                # Motion supervision
                loss_motion = 0
                res.stop = True
                for j, point in enumerate(points):
                    direction = torch.Tensor(
                        [targets[j][1] - point[1], targets[j][0] - point[0]])
                    if torch.linalg.norm(direction) > max(2 / 512 * h, 2):
                        res.stop = False
                    if torch.linalg.norm(direction) > 1:
                        distance = (
                            (xx.to(self._device) - point[0])**2 + (yy.to(self._device) - point[1])**2)**0.5
                        relis, reljs = torch.where(
                            distance < round(r1 / 512 * h))
                        direction = direction / \
                            (torch.linalg.norm(direction) + 1e-7)
                        gridh = (relis-direction[1]) / (h-1) * 2 - 1
                        gridw = (reljs-direction[0]) / (w-1) * 2 - 1
                        grid = torch.stack(
                            [gridw, gridh], dim=-1).unsqueeze(0).unsqueeze(0)
                        target = F.grid_sample(
                            feat_resize.float(), grid, align_corners=True).squeeze(2)
                        loss_motion += F.l1_loss(
                            feat_resize[:, :, relis, reljs], target.detach())

                loss = loss_motion
                if mask is not None:
                    if mask.min() == 0 and mask.max() == 1:
                        mask_usq = mask.to(
                            self._device).unsqueeze(0).unsqueeze(0)
                        loss_fix = F.l1_loss(
                            feat_resize * mask_usq, self.feat0_resize * mask_usq)
                        loss += lambda_mask * loss_fix

                # latent code regularization
                loss += reg * F.l1_loss(ws, self.w0)
                if not res.stop:
                    self.w_optim.zero_grad()
                    loss.backward()
                    self.w_optim.step()

            # Scale and convert to uint8.
            img = img[0]
            if img_normalize:
                img = img / img.norm(float('inf'),
                                     dim=[1, 2], keepdim=True).clip(1e-8, 1e8)
            img = img * (10 ** (img_scale_db / 20))
            img = (img * 127.5 + 128).clamp(0,
                                            255).to(torch.uint8).permute(1, 2, 0)
            if to_pil:
                from PIL import Image
                img = img.cpu().numpy()
                img = Image.fromarray(img)
            res.image = img
            res.w = ws.detach().cpu().numpy()
        except Exception as e:
            import os
            print(f'Renderer error: {e}')
            print("Out of memory error occurred. Restarting the app...")
            os.execv(sys.executable, ['python'] + sys.argv)

# ----------------------------------------------------------------------------