Project: s41467-024-45059-8 | Function: haptic (python)

system: You are an expert Python programmer implementing algorithms from scientific papers.
Complete the masked function based on the algorithm description.
Follow Python best practices and maintain consistent code style.
Return **only** the complete Python function code.

user: Complete this Python function:

**DESCRIPTION:** Control vibrotactile haptic actuators to provide haptic feedback at specified locations

**KEY TERMS:** {
  "board": "haptic controller board",
  "pwm1_list": "PWM channels for actuators",
  "act": "actuator index to activate",
  "amp": "vibration amplitude",
  "t": "vibration duration"
}

**CONTEXT CODE:** import argparse
import numpy as np
import h5py
import cv2
import random
from utils import *

def generate_states(length, num_finger, repeat_bool, space_bool):
    output = np.zeros((num_finger, length))
    list = []
    st = 0
    if space_bool: st = -1
    if repeat_bool == False:
        while len(list) < length:
            r = random.randint(st, num_finger-1)
            if r not in list: list.append(r)

    else:
        while len(list) < length:
            list.append(random.randint(st, num_finger-1))

    for i in range(len(list)):
        v = list[i]
        output[v, i] = 1

    return list, output


def tactile(ser, w, h, f, inited, viz_bool, fc):
    p = readPressure(ser, w, h)
    ts = getUnixTimestamp()
    pressure = np.asanyarray([p[0, 0], p[1, 0]])

    '''store'''
    if f != None:
        data = {'pressure': pressure, 'ts': ts, 'fc': fc}
        inited = addFrame(f, inited, data)

    '''viz'''
    if viz_bool:
        while True:
            img = viz(data, 500, 1024)
            cv2.imshow('VizualizerTouch', img)
            if cv2.waitKey(1) & 0xff == 27:
                break

    return inited, pressure


def haptic(board, pwm1_list, out1_list, pwm2_list, out2_list, act):
    # MASKED: Control vibrotactile haptic actuators to provide haptic feedback at specified locations implementation
    raise NotImplementedError("This function is masked for testing purposes.")



def record_act(ser, w, h, board, pwm1_list, out1_list, pwm2_list, out2_list, f, inited, viz_bool, fc, act):
    p = readPressure(ser, w, h)
    ts = getUnixTimestamp()
    pressure = np.asanyarray([p[0, 1], p[1, 1], p[2, 1], p[0, 0], p[1, 0], p[2, 0]])

    # ind = np.argmax(pressure)

    '''activate according to pre-defined sequence'''
    amp = 1
    c = 1
    t = 2 / 1000
    if act >= 0:
        _ = vibrate(board, pwm1_list[act], out1_list[act], pwm2_list[act], out2_list[act], amp, c, t)

    '''store'''
    if f != None:
        data = {'pressure': pressure, 'ts': ts, 'fc': fc}
        inited = addFrame(f, inited, data)

    '''viz'''
    if viz_bool:
        while True:
            img = viz(data, 500, 1024)
            cv2.imshow('VizualizerTouch', img)
            if cv2.waitKey(1) & 0xff == 27:
                break

    return inited, pressure


def extract_tactile(pressure, spacing, sec, st, space_bool):
    # MASKED: Extract tactile interaction sequences from pressure sensor data with temporal averaging and thresholding implementation
    raise NotImplementedError("This function is masked for testing purposes.")





Complete the function implementation replacing "raise NotImplementedError".