Python torch.from_numpy函数代码示例

    def get_hierarchical_features_till_spawn(self, actions, backtrack_steps=0):

        action_length = len(actions)-1
        pa, ca, pq_idx, cq_idx, ph_idx = flat_to_hierarchical_actions(actions)

        target_pos_idx = action_length - backtrack_steps

        controller_step = True
        if target_pos_idx in pq_idx:
            controller_step = False

        pq_idx_pruned = [v for v in pq_idx if v <= target_pos_idx]
        pa_pruned = pa[:len(pq_idx_pruned)+1]

        images = self.get_frames(
            self.episode_house,
            self.episode_pos_queue,
            preprocess=True)
        raw_img_feats = self.cnn(
            Variable(torch.FloatTensor(images)
                     .cuda())).data.cpu().numpy().copy()

        controller_img_feat, controller_action_in = False, False
        if controller_step == True:
            controller_img_feat = torch.from_numpy(raw_img_feats[target_pos_idx].copy())
            controller_action_in = pa_pruned[-1] - 2

        planner_img_feats = torch.from_numpy(raw_img_feats[pq_idx_pruned].copy())
        planner_actions_in = torch.from_numpy(np.array(pa_pruned[:-1]) - 1)

        return planner_actions_in, planner_img_feats, controller_step, controller_action_in, controller_img_feat, self.episode_pos_queue[target_pos_idx]

    def predict_proba(self, dataset):
        """Predict predict probability for dataset.
        This method will only work with method logistic/multiclass

        Parameters:
        ----------
        dataset (dict): dictionary with the testing dataset -
        X_wide_test, X_deep_test, target

        Returns:
        --------
        array-like with the probability for dataset.
        """

        X_w = Variable(torch.from_numpy(dataset.wide)).float()
        X_d = Variable(torch.from_numpy(dataset.deep))

        if use_cuda:
            X_w, X_d = X_w.cuda(), X_d.cuda()

        # set the model in evaluation mode so dropout is not applied
        net = self.eval()
        pred = net(X_w,X_d).cpu()
        if self.method == "logistic":
            pred = pred.squeeze(1).data.numpy()
            probs = np.zeros([pred.shape[0],2])
            probs[:,0] = 1-pred
            probs[:,1] = pred
            return probs
        if self.method == "multiclass":
            return pred.data.numpy()

def evaluate(attention_model,x_test,y_test):
    """
        cv results
 
        Args:
            attention_model : {object} model
            x_test          : {nplist} x_test
            y_test          : {nplist} y_test
       
        Returns:
            cv-accuracy
 
      
    """
   
    attention_model.batch_size = x_test.shape[0]
    attention_model.hidden_state = attention_model.init_hidden()
    x_test_var = Variable(torch.from_numpy(x_test).type(torch.LongTensor))
    y_test_pred,_ = attention_model(x_test_var)
    if bool(attention_model.type):
        y_preds = torch.max(y_test_pred,1)[1]
        y_test_var = Variable(torch.from_numpy(y_test).type(torch.LongTensor))
       
    else:
        y_preds = torch.round(y_test_pred.type(torch.DoubleTensor).squeeze(1))
        y_test_var = Variable(torch.from_numpy(y_test).type(torch.DoubleTensor))
       
    return torch.eq(y_preds,y_test_var).data.sum()/x_test_var.size(0)

def im_detect(net, im):
    blobs, im_scales = _get_blobs(im)
    assert len(im_scales) == 1, "Only single-image batch implemented"

    im_blob = blobs['data']
    blobs['im_info'] = np.array(
        [im_blob.shape[1], im_blob.shape[2], im_scales[0]], dtype=np.float32)

    _, scores, bbox_pred, rois = net.test_image(blobs['data'],
                                                blobs['im_info'])

    boxes = rois[:, 1:5] / im_scales[0]
    scores = np.reshape(scores, [scores.shape[0], -1])
    bbox_pred = np.reshape(bbox_pred, [bbox_pred.shape[0], -1])
    if cfg.TEST.BBOX_REG:
        # Apply bounding-box regression deltas
        box_deltas = bbox_pred
        pred_boxes = bbox_transform_inv(
            torch.from_numpy(boxes), torch.from_numpy(box_deltas)).numpy()
        pred_boxes = _clip_boxes(pred_boxes, im.shape)
    else:
        # Simply repeat the boxes, once for each class
        pred_boxes = np.tile(boxes, (1, scores.shape[1]))

    return scores, pred_boxes

def get_test_data(num_train=1000, num_test=500, 
                  input_shape=(10,), output_shape=(2,),
                  classification=True, num_classes=2):
    """Generates test data to train a model on.

    classification=True overrides output_shape
    (i.e. output_shape is set to (1,)) and the output
    consists in integers in [0, num_class-1].

    Otherwise: float output with shape output_shape.
    """
    samples = num_train + num_test
    if classification:
        y = np.random.randint(0, num_classes, size=(samples,))
        X = np.zeros((samples,) + input_shape)
        for i in range(samples):
            X[i] = np.random.normal(loc=y[i], scale=0.7, size=input_shape)
    else:
        y_loc = np.random.random((samples,))
        X = np.zeros((samples,) + input_shape)
        y = np.zeros((samples,) + output_shape)
        for i in range(samples):
            X[i] = np.random.normal(loc=y_loc[i], scale=0.7, size=input_shape)
            y[i] = np.random.normal(loc=y_loc[i], scale=0.7, size=output_shape)

    return (th.from_numpy(X[:num_train]), th.from_numpy(y[:num_train])), \
           (th.from_numpy(X[num_train:]), th.from_numpy(y[num_train:]))

def resize(original, um_sizes, desired_res):
    """ Resize array originally of um_sizes size to have desired_res resolution.

    We preserve the center of original and resized arrays exactly in the middle. We also
    make sure resolution is exactly the desired resolution. Given these two constraints,
    we cannot hold FOV of original and resized arrays to be exactly the same.

    :param np.array original: Array to resize.
    :param tuple um_sizes: Size in microns of the array (one per axis).
    :param int or tuple desired_res: Desired resolution (um/px) for the output array.

    :return: Output array (np.float32) resampled to the desired resolution. Size in pixels
        is round(um_sizes / desired_res).
    """
    import torch.nn.functional as F

    # Create grid to sample in microns
    grid = create_grid(um_sizes, desired_res) # d x h x w x 3

    # Re-express as a torch grid [-1, 1]
    um_per_px = np.array([um / px for um, px in zip(um_sizes, original.shape)])
    torch_ones = np.array(um_sizes) / 2 - um_per_px / 2  # sample position of last pixel in original
    grid = grid / torch_ones[::-1].astype(np.float32)

    # Resample
    input_tensor = torch.from_numpy(original.reshape(1, 1, *original.shape).astype(
        np.float32))
    grid_tensor = torch.from_numpy(grid.reshape(1, *grid.shape))
    resized_tensor = F.grid_sample(input_tensor, grid_tensor, padding_mode='border')
    resized = resized_tensor.numpy().squeeze()

    return resized

def interpolate(ae, gg, z1, z2, vocab,
                steps=5, sample=None, maxlen=None):
    """
    Interpolating in z space
    Assumes that type(z1) == type(z2)
    """
    if type(z1) == Variable:
        noise1 = z1
        noise2 = z2
    elif type(z1) == torch.FloatTensor or type(z1) == torch.cuda.FloatTensor:
        noise1 = Variable(z1, volatile=True)
        noise2 = Variable(z2, volatile=True)
    elif type(z1) == np.ndarray:
        noise1 = Variable(torch.from_numpy(z1).float(), volatile=True)
        noise2 = Variable(torch.from_numpy(z2).float(), volatile=True)
    else:
        raise ValueError("Unsupported input type (noise): {}".format(type(z1)))

    # interpolation weights
    lambdas = [x*1.0/(steps-1) for x in range(steps)]

    gens = []
    for L in lambdas:
        gens.append(generate(ae, gg, (1-L)*noise1 + L*noise2,
                             vocab, sample, maxlen))

    interpolations = []
    for i in range(len(gens[0])):
        interpolations.append([s[i] for s in gens])
    return interpolations

def average_without_padding(x, ids, padding_id, cuda=False, eps=1e-8):
    if cuda:
        mask = Variable(torch.from_numpy(np.not_equal(ids, padding_id).astype(int)[:,:,np.newaxis])).float().cuda().permute(1, 2, 0).expand_as(x)
    else:
        mask = Variable(torch.from_numpy(np.not_equal(ids, padding_id).astype(int)[:,:,np.newaxis])).float().permute(1, 2, 0).expand_as(x)
    s = torch.sum(x*mask, dim=2) / (torch.sum(mask, dim=2)+eps)
    return s

def artist_works_with_labels():     # painting from the famous artist (real target)
    a = np.random.uniform(1, 2, size=BATCH_SIZE)[:, np.newaxis]
    paintings = a * np.power(PAINT_POINTS, 2) + (a-1)
    labels = (a-1) > 0.5            # upper paintings (1), lower paintings (0), two classes
    paintings = torch.from_numpy(paintings).float()
    labels = torch.from_numpy(labels.astype(np.float32))
    return paintings, labels

    def run_test(self, args):
        print("testing...")
        self.eval()

        game = DoomInstance(
            args.vizdoom_config, args.wad_path, args.skiprate, visible=True, actions=args.action_set, bot_cmd=args.bot_cmd)
        step_state = game.get_state_normalized()

        state = NormalizedState(screen=None, depth=None, labels=None, variables=None)
        state.screen = torch.Tensor(1, *args.screen_size)
        state.variables = torch.Tensor(1, args.variable_num)

        while True:
            # convert state to torch tensors
            state.screen[0, :] = torch.from_numpy(step_state.screen)
            state.variables[0, :] = torch.from_numpy(step_state.variables)
            # compute an action
            action = self.get_action(state)
            # render
            step_state, _, finished = game.step_normalized(action[0][0])
            #img = step_state.screen[0:3, :]
            #img = img.transpose(1, 2, 0)
            #plt.imsave('depth-plan.png', img)
            if finished:
                print("episode return: {}".format(game.get_episode_return()))
                self.set_terminal(torch.zeros(1))

def flow_resnet50_aux(pretrained=False, **kwargs):
    """Constructs a ResNet-50 model.

    Args:
        pretrained (bool): If True, returns a model pre-trained on ImageNet
    """
    model = ResNet(Bottleneck, [3, 4, 6, 3], **kwargs)
    if pretrained:
        # model.load_state_dict(model_zoo.load_url(model_urls['resnet50']))
        pretrained_dict = model_zoo.load_url(model_urls['resnet50'])

        model_dict = model.state_dict()
        fc_origin_weight = pretrained_dict["fc.weight"].data.numpy()
        fc_origin_bias = pretrained_dict["fc.bias"].data.numpy()

        # 1. filter out unnecessary keys
        pretrained_dict = {k: v for k, v in pretrained_dict.items() if k in model_dict}
        # 2. overwrite entries in the existing state dict
        model_dict.update(pretrained_dict) 
        # print(model_dict)
        fc_new_weight = model_dict["fc_aux.weight"].numpy() 
        fc_new_bias = model_dict["fc_aux.bias"].numpy() 

        fc_new_weight[:1000, :] = fc_origin_weight
        fc_new_bias[:1000] = fc_origin_bias

        model_dict["fc_aux.weight"] = torch.from_numpy(fc_new_weight)
        model_dict["fc_aux.bias"] = torch.from_numpy(fc_new_bias)

        # 3. load the new state dict
        model.load_state_dict(model_dict)

    return model

    def __init__(self, height, width, lr = 1, aux_loss = False, ray_tracing = False):
        super(Depth3DGridGen_with_mask, self).__init__()
        self.height, self.width = height, width
        self.aux_loss = aux_loss
        self.lr = lr
        self.ray_tracing = ray_tracing

        self.grid = np.zeros( [self.height, self.width, 3], dtype=np.float32)
        self.grid[:,:,0] = np.expand_dims(np.repeat(np.expand_dims(np.arange(-1, 1, 2.0/self.height), 0), repeats = self.width, axis = 0).T, 0)
        self.grid[:,:,1] = np.expand_dims(np.repeat(np.expand_dims(np.arange(-1, 1, 2.0/self.width), 0), repeats = self.height, axis = 0), 0)
        self.grid[:,:,2] = np.ones([self.height, width])
        self.grid = torch.from_numpy(self.grid.astype(np.float32))

        self.theta = self.grid[:,:,0] * np.pi/2 + np.pi/2
        self.phi = self.grid[:,:,1] * np.pi

        self.x = torch.sin(self.theta) * torch.cos(self.phi)
        self.y = torch.sin(self.theta) * torch.sin(self.phi)
        self.z = torch.cos(self.theta)

        self.grid3d = torch.from_numpy(np.zeros( [self.height, self.width, 4], dtype=np.float32))

        self.grid3d[:,:,0] = self.x
        self.grid3d[:,:,1] = self.y
        self.grid3d[:,:,2] = self.z
        self.grid3d[:,:,3] = self.grid[:,:,2]

def train():
    num_classses = 21
    net = ssd.SSD300(num_classes=num_classses)
    ssd_box_coder = ssd.SSDBoxCoder(net)

    C, H, W = (3, 300, 300)
    x = Variable(torch.randn(1, C, H, W))
    boxes = torch.from_numpy(np.array([(0, 0, 100, 100), (25, 25, 125, 125), (200, 200, 250, 250), (0, 0, 300, 300)], dtype=np.float32))
    labels = torch.from_numpy(np.array([1, 2, 3, 4], dtype=np.long))
    loc_targets, cls_targets = ssd_box_coder.encode(boxes, labels)
    loc_targets = loc_targets[None, :]
    cls_targets = cls_targets[None, :]
    # print('loc_targets.size():{}'.format(loc_targets.size()))
    # print('cls_targets.size():{}'.format(cls_targets.size()))

    optimizer = optim.SGD(net.parameters(), lr=1e-5, momentum=0.9, weight_decay=5e-4)
    criterion = ssd.SSDLoss(num_classes=num_classses)

    for epoch in range(100):
        loc_preds, cls_preds = net(x)
        # print('loc_preds.size():{}'.format(loc_preds.size()))
        # print('cls_preds.size():{}'.format(cls_preds.size()))
        optimizer.zero_grad()

        loss = criterion(loc_preds, loc_targets, cls_preds, cls_targets)
        loss.backward()
        optimizer.step()

    def transform(self, img, lbl):
        """transform

        :param img:
        :param lbl:
        """
        img = img[:, :, ::-1]
        img = img.astype(np.float64)
        img -= self.mean
        img = m.imresize(img, (self.img_size[0], self.img_size[1]))
        # Resize scales images from 0 to 255, thus we need
        # to divide by 255.0
        img = img.astype(float) / 255.0
        # NHWC -> NCWH
        img = img.transpose(2, 0, 1)
        
        classes = np.unique(lbl)
        lbl = lbl.astype(float)
        lbl = m.imresize(lbl, (self.img_size[0], self.img_size[1]), 'nearest', mode='F')
        lbl = lbl.astype(int)
        

        if not np.all(classes == np.unique(lbl)):
            print("WARN: resizing labels yielded fewer classes")

        if not np.all(np.unique(lbl[lbl!=self.ignore_index]) < self.n_classes):
            print('after det', classes,  np.unique(lbl))
            raise ValueError("Segmentation map contained invalid class values")

        img = torch.from_numpy(img).float()
        lbl = torch.from_numpy(lbl).long()

        return img, lbl

def l2l_validate(model, cluster_center, n_epoch=100):
    val_accuracy = []
    for epoch in range(n_epoch):
        data_l = generate_data_l(cluster_center)
        data_n = generate_data_n(cluster_center, model.n_class_n)
        x_l, y_l = Variable(torch.from_numpy(data_l[0])).float(), Variable(
            torch.from_numpy(data_l[1]))
        x_n, y_n = Variable(torch.from_numpy(data_n[0])).float(), Variable(
            torch.from_numpy(data_n[1]))
        pred_ll, pred_nl, w, b = model(x_l, x_n)
        M = Variable(torch.zeros(model.n_class_n, model.n_dim))
        B = Variable(torch.zeros(model.n_class_n))
        for k in range(model.n_class_n):
            M[k] = torch.cat((w[:, 0][y_n == model.n_class_l + k].view(-1, 1),
                              w[:, 1][y_n == model.n_class_l + k].view(-1, 1)), 1).mean(0)
            B[k] = b[y_n == model.n_class_l + k].mean()
        pred_ln = torch.mm(x_l, M.t()) + B.view(1, -1).expand_as(torch.mm(x_l, M.t()))
        pred_nn = torch.mm(x_n, M.t()) + B.view(1, -1).expand_as(torch.mm(x_n, M.t()))
        pred = torch.cat((torch.cat((pred_ll, pred_nl)), torch.cat((pred_ln, pred_nn))), 1)
        pred = pred.data.max(1)[1]
        y = torch.cat((y_l, y_n))
        accuracy = pred.eq(y.data).cpu().sum() * 1.0 / y.size()[0]
        # print('accuracy: %.2f' % accuracy)
        val_accuracy.append(accuracy)
        acc_l = pred.eq(y.data).cpu()[0:100].sum() * 1.0 / 100
        acc_n = pred.eq(y.data).cpu()[100:150].sum() * 1.0 / 50
        print('accuracy: %.2f, lifelong accuracy: %.2f, new accuracy: %.2f' % (accuracy, acc_l, acc_n))

    return numpy.mean(numpy.asarray(val_accuracy))