Python random.random() Examples

def __init__(self, name, infected, infection_length, initiative,
                 coupling_tendency, condom_use, test_frequency, commitment,
                 coupled=False, coupled_length=0, known=False, partner=None):
        init_state = random.randint(0, 3)
        super().__init__(name, "wandering around", NSTATES, init_state)
        self.coupled = coupled
        self.couple_length = coupled_length
        self.partner = partner
        self.initiative = initiative
        self.infected = infected
        self.known = known
        self.infection_length = infection_length
        self.coupling_tendency = coupling_tendency
        self.condom_use = condom_use
        self.test_frequency = test_frequency
        self.commitment = commitment
        self.state = init_state
        self.update_ntype() 

def discourage(unwanted):
    """
    Discourages extra drinkers from going to the bar by decreasing motivation.
    Chooses drinkers randomly from the drinkers that went to the bar.
    """
    discouraged = 0
    drinkers = get_group(DRINKERS)
    while unwanted:
        if DEBUG:
            user_tell("The members are: " + drinkers.members)
        rand_name = random.choice(list(drinkers.members))
        rand_agent = drinkers[rand_name]

        if DEBUG:
            user_tell("drinker ", rand_agent, " = "
                      + repr(drinkers[rand_agent]))

        rand_agent[MOTIV] = max(rand_agent[MOTIV] - DISC_AMT,
                                MIN_MOTIV)
        discouraged += 1
        unwanted -= 1
    return discouraged 

def initial_solution(self):
        """
        Greedy algorithm to get an initial solution (closest-neighbour).
        """
        cur_node = random.choice(self.nodes)  # start from a random node
        solution = [cur_node]

        free_nodes = set(self.nodes)
        free_nodes.remove(cur_node)
        while free_nodes:
            next_node = min(free_nodes, key=lambda x: self.dist(cur_node, x))  # nearest neighbour
            free_nodes.remove(next_node)
            solution.append(next_node)
            cur_node = next_node

        cur_fit = self.fitness(solution)
        if cur_fit < self.best_fitness:  # If best found so far, update best fitness
            self.best_fitness = cur_fit
            self.best_solution = solution
        self.fitness_list.append(cur_fit)
        return solution, cur_fit 

def anneal(self):
        """
        Execute simulated annealing algorithm.
        """
        # Initialize with the greedy solution.
        self.cur_solution, self.cur_fitness = self.initial_solution()

        print("Starting annealing.")
        while self.T >= self.stopping_temperature and self.iteration < self.stopping_iter:
            candidate = list(self.cur_solution)
            l = random.randint(2, self.N - 1)
            i = random.randint(0, self.N - l)
            candidate[i : (i + l)] = reversed(candidate[i : (i + l)])
            self.accept(candidate)
            self.T *= self.alpha
            self.iteration += 1

            self.fitness_list.append(self.cur_fitness)

        print("Best fitness obtained: ", self.best_fitness)
        improvement = 100 * (self.fitness_list[0] - self.best_fitness) / (self.fitness_list[0])
        print(f"Improvement over greedy heuristic: {improvement : .2f}%") 

def make_train_test_sets(pos_graphs, neg_graphs,
                         test_proportion=.3, random_state=2):
    """make_train_test_sets."""
    random.seed(random_state)
    random.shuffle(pos_graphs)
    random.shuffle(neg_graphs)
    pos_dim = len(pos_graphs)
    neg_dim = len(neg_graphs)
    tr_pos_graphs = pos_graphs[:-int(pos_dim * test_proportion)]
    te_pos_graphs = pos_graphs[-int(pos_dim * test_proportion):]
    tr_neg_graphs = neg_graphs[:-int(neg_dim * test_proportion)]
    te_neg_graphs = neg_graphs[-int(neg_dim * test_proportion):]
    tr_graphs = tr_pos_graphs + tr_neg_graphs
    te_graphs = te_pos_graphs + te_neg_graphs
    tr_targets = [1] * len(tr_pos_graphs) + [0] * len(tr_neg_graphs)
    te_targets = [1] * len(te_pos_graphs) + [0] * len(te_neg_graphs)
    tr_graphs, tr_targets = paired_shuffle(tr_graphs, tr_targets)
    te_graphs, te_targets = paired_shuffle(te_graphs, te_targets)
    return (tr_graphs, np.array(tr_targets)), (te_graphs, np.array(te_targets)) 

def getTsvData(self, filepath):
        print("Loading training data from "+filepath)
        x1=[]
        x2=[]
        y=[]
        # positive samples from file
        for line in open(filepath):
            l=line.strip().split("\t")
            if len(l)<2:
                continue
            if random() > 0.5:
                x1.append(l[0].lower())
                x2.append(l[1].lower())
            else:
                x1.append(l[1].lower())
                x2.append(l[0].lower())
            y.append(int(l[2]))
        return np.asarray(x1),np.asarray(x2),np.asarray(y) 

def batch_iter(self, data, batch_size, num_epochs, shuffle=True):
        """
        Generates a batch iterator for a dataset.
        """
        data = np.asarray(data)
        print(data)
        print(data.shape)
        data_size = len(data)
        num_batches_per_epoch = int(len(data)/batch_size) + 1
        for epoch in range(num_epochs):
            # Shuffle the data at each epoch
            if shuffle:
                shuffle_indices = np.random.permutation(np.arange(data_size))
                shuffled_data = data[shuffle_indices]
            else:
                shuffled_data = data
            for batch_num in range(num_batches_per_epoch):
                start_index = batch_num * batch_size
                end_index = min((batch_num + 1) * batch_size, data_size)
                yield shuffled_data[start_index:end_index] 

def train_step(x1_batch, x2_batch, y_batch):
        """
        A single training step
        """
        if random()>0.5:
            feed_dict = {
                siameseModel.input_x1: x1_batch,
                siameseModel.input_x2: x2_batch,
                siameseModel.input_y: y_batch,
                siameseModel.dropout_keep_prob: FLAGS.dropout_keep_prob,
            }
        else:
            feed_dict = {
                siameseModel.input_x1: x2_batch,
                siameseModel.input_x2: x1_batch,
                siameseModel.input_y: y_batch,
                siameseModel.dropout_keep_prob: FLAGS.dropout_keep_prob,
            }
        _, step, loss, accuracy, dist, sim, summaries = sess.run([tr_op_set, global_step, siameseModel.loss, siameseModel.accuracy, siameseModel.distance, siameseModel.temp_sim, train_summary_op],  feed_dict)
        time_str = datetime.datetime.now().isoformat()
        print("TRAIN {}: step {}, loss {:g}, acc {:g}".format(time_str, step, loss, accuracy))
        train_summary_writer.add_summary(summaries, step)
        print(y_batch, dist, sim) 

def __call__(self, video):
    """
    Args:
        video (np.ndarray): Video to be cropped.
    Returns:
        np.ndarray: Cropped video.
    """
    if self.padding > 0:
      pad = Pad(self.padding, 0)
      video = pad(video)

    w, h = video.shape[-2], video.shape[-3]
    th, tw = self.size
    if w == tw and h == th:
      return video

    x1 = random.randint(0, w-tw)
    y1 = random.randint(0, h-th)
    return video[..., y1:y1+th, x1:x1+tw, :] 

def __call__(self, video):
    for attempt in range(10):
      area = video.shape[-3]*video.shape[-2]
      target_area = random.uniform(0.08, 1.0)*area
      aspect_ratio = random.uniform(3./4, 4./3)

      w = int(round(math.sqrt(target_area*aspect_ratio)))
      h = int(round(math.sqrt(target_area/aspect_ratio)))

      if random.random() < 0.5:
        w, h = h, w

      if w <= video.shape[-2] and h <= video.shape[-3]:
        x1 = random.randint(0, video.shape[-2]-w)
        y1 = random.randint(0, video.shape[-3]-h)

        video = video[..., y1:y1+h, x1:x1+w, :]

        return resize(video, (self.size, self.size), self.interpolation)

    # Fallback
    scale = Scale(self.size, interpolation=self.interpolation)
    crop = CenterCrop(self.size)
    return crop(scale(video)) 

def __getitem__(self, idx):
    length = self.n_frames_input + self.n_frames_output
    if self.is_train or self.num_objects[0] != 2:
      # Sample number of objects
      num_digits = random.choice(self.num_objects)
      # Generate data on the fly
      images = self.generate_moving_mnist(num_digits)
    else:
      images = self.dataset[:, idx, ...]

    if self.transform is not None:
      images = self.transform(images)
    input = images[:self.n_frames_input]
    if self.n_frames_output > 0:
      output = images[self.n_frames_input:length]
    else:
      output = []

    return input, output 

def generate_ip_verify_hash(input_dict):
    """
    生成一个标示用户身份的hash
    在 human_ip_verification 功能中使用
    hash一共14位
    hash(前7位+salt) = 后7位 以此来进行验证
    :rtype str
    """
    strbuff = human_ip_verification_answers_hash_str
    for key in input_dict:
        strbuff += key + input_dict[key] + str(random.randint(0, 9000000))
    input_key_hash = hex(zlib.adler32(strbuff.encode(encoding='utf-8')))[2:]
    while len(input_key_hash) < 7:
        input_key_hash += '0'
    output_hash = hex(zlib.adler32((input_key_hash + human_ip_verification_answers_hash_str).encode(encoding='utf-8')))[2:]
    while len(output_hash) < 7:
        output_hash += '0'
    return input_key_hash + output_hash 

def random_projection(X):

        data_demension = X.shape[1]

        new_data_demension = random.randint(2, data_demension)

        new_X = np.empty((data_demension, new_data_demension))

        minus_one = 0.1
        positive_one = 0.9

        for i in range(len(new_X)):
            for j in range(len(new_X[i])):
                rand = random.random()
                if rand < minus_one:
                    new_X[i][j] = -1.0
                elif rand >= positive_one:
                    new_X[i][j] = 1.0
                else:
                    new_X[i][j] = 0.0

        new_X = np.inner(X, new_X.T)

        return new_X 

def should_step_get_rejected(self, standardError):
        """
        Given a standard error, return whether to keep or reject new
        standard error according to the constraint reject probability.

        :Parameters:
            #. standardError (number): The standard error to compare with
            the Constraint standard error

        :Return:
            #. result (boolean): True to reject step, False to accept
        """
        if self.standardError is None:
            raise Exception(LOGGER.error("must compute data first"))
        if standardError<=self.standardError:
            return False
        return randfloat() < self.__rejectProbability 

def estimate_density(DATA_PATH, feature_size):
    """sample 10 times of a size of 1000 for estimating the density of the sparse dataset"""
    if not os.path.exists(DATA_PATH):
        raise Exception("Data is not there!")
    density = []
    P = 0.01
    for _ in range(10):
        num_non_zero = 0
        num_sample = 0
        with open(DATA_PATH) as f:
            for line in f:
                if (random.random() < P):
                    num_non_zero += len(line.split(" ")) - 1
                    num_sample += 1
        density.append(num_non_zero * 1.0 / (feature_size * num_sample))
    return sum(density) / len(density) 

def initialise():
    forest = [[tree if random.random() <= initial_trees else space for x in range(forest_width)] for y in range(forest_height)]
    return forest 

def update_forest(forest):
    new_forest = [[space for x in range(forest_width)] for y in range(forest_height)]
    for x in range(forest_width):
        for y in range(forest_height):
            if forest[x][y] == burning:
                new_forest[x][y] = space
            elif forest[x][y] == space:
                new_forest[x][y] = tree if random.random() <= p else space
            elif forest[x][y] == tree:
                neighbours = get_neighbours(x, y, hood_size)
                new_forest[x][y] = (burning if any([forest[n[0]][n[1]] == burning for n in neighbours]) or random.random() <= f else tree)
    return new_forest 

def prob_state_trans(curr_state, states):
    """
    Do a probabilistic state transition.
    """
    new_state = curr_state
    r = random()
    cum_prob = 0.0
    for trans_state in range(len(states[curr_state])):
        cum_prob += states[curr_state][trans_state]
        if cum_prob >= r:
            new_state = trans_state
            break
    return new_state 

def move(self, max_move=DEF_MAX_MOVE, angle=None):
        """
        Move this agent to a random pos within max_move
        of its current pos.
        """
        if (self.is_located() and self.locator is not None
                and not self.locator.is_full()):
            new_xy = None
            if angle is not None:
                if DEBUG2:
                    user_log_notif("Using angled move")
                new_xy = self.locator.point_from_vector(angle,
                                                        max_move, self.pos)
            self.locator.place_member(self, max_move=max_move, xy=new_xy) 

def probvec_to_state(pv):
    state_vec = None
    cum_prob = 0.0
    r = random.random()
    l = pv.shape[COLS]
    for i in range(l):
        cum_prob += pv.item(i)
        if cum_prob >= r:
            state_vec = state_vector(l, i)
            break
    return state_vec 

def utils_from_good(self, good):
        if not self.sells(good):
            return NA
        else:
            return (random.random() + self.util_adj) * ADJ_SCALING_FACTOR 

def infect(self):
        if (self.coupled is True and self.infected is True and
                self.known is False and self.partner.infected is False):
            if (10 * random.random() > self.condom_use or
                    10 * random.random() > self.partner.condom_use):
                if 100 * random.random() < INFECTION_CHANCE:
                    self.partner.infected = True
                    # print(self.name, "has infected", self.partner.name) 

def preact(self):
        # print(self.name, "is preacting")
        self.update_ntype()
        if self.coupled is False:
            if 10 * random.random() < self.coupling_tendency:
                self.couple()
        if isinstance(self.partner, str):
            self.partner = self.env.get_obj(self.partner)
        if self.coupled is True:
            if isinstance(self.partner.partner, str):
                self.partner.partner = self.env.get_obj(self.partner.partner)
            self.infect()
            self.partner.infect() 

def test(self):
        if (2 * random.random() < self.test_frequency and
                self.infected is True and self.known is False):
            self.known = True
            # print(self.name, "has been tested positive")
            if self.infection_length > SYMPTOMS_SHOW:
                if random.random() <= SYMPTOMS_SHOW_PROB:
                    self.known = True
                    # print(self.name, "has developed symptoms") 

def act(self):
        self.sitting = False
        if self.coupons < self.min_holdings:
            self.goal = BABYSIT
        elif self.coupons > self.min_holdings:
            if random.random() > .5:
                self.goal = GO_OUT
            else:
                self.goal = BABYSIT 

def get_rand_good_type():
    """
    Randomly select consumer's item needed
    after each run.
    """
    return random.choice(list(mp_stores.keys())) 

def calc_util(stores):
    """
    calculate utility for stores.
    """
    return random.random() 

def get_decision(agent):
    """
    Makes a decision for the agent whether or not to go to the bar
    """
    return random.random() <= agent[MOTIV] 

def babysitter_action(agent):
    """
    Co-op members act as follows:
    if their holding coupons are less than desired cash balance, they babysit,
    or there is a 50-50 chance for them to go out.
    """
    if agent['coupons'] <= agent['desired_cash']:
        agent['goal'] = "BABYSITTING"
    else:
        if random.random() > .5:
            agent['goal'] = "GOING_OUT"
        else:
            agent['goal'] = "BABYSITTING"
    return True 

def create_rholder(name, i, props=None):
    """
    Create an agent.
    """
    k_price = DEF_K_PRICE
    resources = copy.deepcopy(DEF_CAP_WANTED)
    num_resources = len(resources)

    price_list = copy.deepcopy(DEF_EACH_CAP_PRICE)
    if props is not None:
        k_price = props.get('cap_price',
                            DEF_K_PRICE)
        for k in price_list.keys():
            price_list[k] = float("{0:.2f}".format(float(k_price
                                                   * random.uniform(0.5,
                                                                    1.5))))

    starting_cash = DEF_RHOLDER_CASH
    if props is not None:
        starting_cash = get_prop('rholder_starting_cash',
                                 DEF_RHOLDER_CASH)

    if props is not None:
        total_resources = get_prop('rholder_starting_resource_total',
                                   DEF_TOTAL_RESOURCES_RHOLDER_HAVE)
        for k in resources.keys():
            resources[k] = int((total_resources * 2)
                               * (random.random() / num_resources))

    return Agent(name + str(i), action=rholder_action,
                 attrs={"cash": starting_cash,
                        "resources": resources,
                        "price": price_list})