How to use the wntr.sim.aml.Param function in wntr

f1 = 0.0
            x2 = x1 + m.leak_delta
            f2 = node.leak_discharge_coeff*node.leak_area*(2.0*9.81*x2)**0.5
            df1 = m.leak_slope
            df2 = 0.5*node.leak_discharge_coeff*node.leak_area*(2.0*9.81)**0.5*x2**(-0.5)
            a, b, c, d = cubic_spline(x1, x2, f1, f2, df1, df2)
            if node_name in m.leak_poly_coeffs_a:
                m.leak_poly_coeffs_a[node_name].value = a
                m.leak_poly_coeffs_b[node_name].value = b
                m.leak_poly_coeffs_c[node_name].value = c
                m.leak_poly_coeffs_d[node_name].value = d
            else:
                m.leak_poly_coeffs_a[node_name] = aml.Param(a)
                m.leak_poly_coeffs_b[node_name] = aml.Param(b)
                m.leak_poly_coeffs_c[node_name] = aml.Param(c)
                m.leak_poly_coeffs_d[node_name] = aml.Param(d)

            updater.add(node, 'leak_discharge_coeff', leak_poly_coeffs_param.update)
            updater.add(node, 'leak_area', leak_poly_coeffs_param.update)

f2 = 1.0
            df1 = 0.5*((x1-pmin)/(pnom-pmin))**(-0.5)*1.0/(pnom-pmin)
            df2 = m.pdd_slope
            a2, b2, c2, d2 = cubic_spline(x1, x2, f1, f2, df1, df2)
            if node_name in m.pdd_poly1_coeffs_a:
                m.pdd_poly1_coeffs_a[node_name].value = a1
                m.pdd_poly1_coeffs_b[node_name].value = b1
                m.pdd_poly1_coeffs_c[node_name].value = c1
                m.pdd_poly1_coeffs_d[node_name].value = d1
                m.pdd_poly2_coeffs_a[node_name].value = a2
                m.pdd_poly2_coeffs_b[node_name].value = b2
                m.pdd_poly2_coeffs_c[node_name].value = c2
                m.pdd_poly2_coeffs_d[node_name].value = d2
            else:
                m.pdd_poly1_coeffs_a[node_name] = aml.Param(a1)
                m.pdd_poly1_coeffs_b[node_name] = aml.Param(b1)
                m.pdd_poly1_coeffs_c[node_name] = aml.Param(c1)
                m.pdd_poly1_coeffs_d[node_name] = aml.Param(d1)
                m.pdd_poly2_coeffs_a[node_name] = aml.Param(a2)
                m.pdd_poly2_coeffs_b[node_name] = aml.Param(b2)
                m.pdd_poly2_coeffs_c[node_name] = aml.Param(c2)
                m.pdd_poly2_coeffs_d[node_name] = aml.Param(d2)

            updater.add(node, 'minimum_pressure', pdd_poly_coeffs_param.update)
            updater.add(node, 'nominal_pressure', pdd_poly_coeffs_param.update)

updater: ModelUpdater
        index_over: list of str
            list of junction names
        """
        if not hasattr(m, 'pmin'):
            m.pmin = aml.ParamDict()

        if index_over is None:
            index_over = wn.junction_name_list

        for node_name in index_over:
            node = wn.get_node(node_name)
            if node_name in m.pmin:
                m.pmin[node_name].value = node.minimum_pressure
            else:
                m.pmin[node_name] = aml.Param(node.minimum_pressure)

            updater.add(node, 'minimum_pressure', pmin_param.update)

updater: ModelUpdater
        index_over: list of str
            list of junction names
        """
        if not hasattr(m, 'elevation'):
            m.elevation = aml.ParamDict()

        if index_over is None:
            index_over = wn.junction_name_list

        for node_name in index_over:
            node = wn.get_node(node_name)
            if node_name in m.elevation:
                m.elevation[node_name].value = node.elevation
            else:
                m.elevation[node_name] = aml.Param(node.elevation)

            updater.add(node, 'elevation', elevation_param.update)

def source_head_param(m, wn):
    """
    Add a head param to the model

    Parameters
    ----------
    m: wntr.aml.aml.aml.Model
    wn: wntr.network.model.WaterNetworkModel
    """
    if not hasattr(m, 'source_head'):
        m.source_head = aml.ParamDict()

        for node_name, node in wn.tanks():
            m.source_head[node_name] = aml.Param(node.head)
        for node_name, node in wn.reservoirs():
            m.source_head[node_name] = aml.Param(node.head_timeseries.at(wn.sim_time))
    else:
        for node_name, node in wn.tanks():
            m.source_head[node_name].value = node.head
        for node_name, node in wn.reservoirs():
            m.source_head[node_name].value = node.head_timeseries.at(wn.sim_time)

index_over: list of str
            list of pipe names
        """
        if not hasattr(m, 'minor_loss'):
            m.minor_loss = aml.ParamDict()

        if index_over is None:
            index_over = wn.pipe_name_list + wn.valve_name_list

        for link_name in index_over:
            link = wn.get_link(link_name)
            value = 8.0 * link.minor_loss / (9.81 * math.pi**2 * link.diameter**4)
            if link_name in m.minor_loss:
                m.minor_loss[link_name].value = value
            else:
                m.minor_loss[link_name] = aml.Param(value)

            updater.add(link, 'minor_loss', minor_loss_param.update)
            updater.add(link, 'diameter', minor_loss_param.update)

node = wn.get_node(node_name)
            x1 = 0.0
            f1 = 0.0
            x2 = x1 + m.leak_delta
            f2 = node.leak_discharge_coeff*node.leak_area*(2.0*9.81*x2)**0.5
            df1 = m.leak_slope
            df2 = 0.5*node.leak_discharge_coeff*node.leak_area*(2.0*9.81)**0.5*x2**(-0.5)
            a, b, c, d = cubic_spline(x1, x2, f1, f2, df1, df2)
            if node_name in m.leak_poly_coeffs_a:
                m.leak_poly_coeffs_a[node_name].value = a
                m.leak_poly_coeffs_b[node_name].value = b
                m.leak_poly_coeffs_c[node_name].value = c
                m.leak_poly_coeffs_d[node_name].value = d
            else:
                m.leak_poly_coeffs_a[node_name] = aml.Param(a)
                m.leak_poly_coeffs_b[node_name] = aml.Param(b)
                m.leak_poly_coeffs_c[node_name] = aml.Param(c)
                m.leak_poly_coeffs_d[node_name] = aml.Param(d)

            updater.add(node, 'leak_discharge_coeff', leak_poly_coeffs_param.update)
            updater.add(node, 'leak_area', leak_poly_coeffs_param.update)

x1 = 0.0
            f1 = 0.0
            x2 = x1 + m.leak_delta
            f2 = node.leak_discharge_coeff*node.leak_area*(2.0*9.81*x2)**0.5
            df1 = m.leak_slope
            df2 = 0.5*node.leak_discharge_coeff*node.leak_area*(2.0*9.81)**0.5*x2**(-0.5)
            a, b, c, d = cubic_spline(x1, x2, f1, f2, df1, df2)
            if node_name in m.leak_poly_coeffs_a:
                m.leak_poly_coeffs_a[node_name].value = a
                m.leak_poly_coeffs_b[node_name].value = b
                m.leak_poly_coeffs_c[node_name].value = c
                m.leak_poly_coeffs_d[node_name].value = d
            else:
                m.leak_poly_coeffs_a[node_name] = aml.Param(a)
                m.leak_poly_coeffs_b[node_name] = aml.Param(b)
                m.leak_poly_coeffs_c[node_name] = aml.Param(c)
                m.leak_poly_coeffs_d[node_name] = aml.Param(d)

            updater.add(node, 'leak_discharge_coeff', leak_poly_coeffs_param.update)
            updater.add(node, 'leak_area', leak_poly_coeffs_param.update)

def expected_demand_param(m, wn):
    """
    Add a demand parameter to the model

    Parameters
    ----------
    m: wntr.aml.aml.aml.Model
    wn: wntr.network.model.WaterNetworkModel
    """
    demand_multiplier = wn.options.hydraulic.demand_multiplier
    if not hasattr(m, 'expected_demand'):
        m.expected_demand = aml.ParamDict()

        for node_name, node in wn.junctions():
            m.expected_demand[node_name] = aml.Param(node.demand_timeseries_list.at(wn.sim_time, multiplier=demand_multiplier))
    else:
        for node_name, node in wn.junctions():
            m.expected_demand[node_name].value = node.demand_timeseries_list.at(wn.sim_time, multiplier=demand_multiplier)

m.pdd_poly1_coeffs_b[node_name].value = b1
                m.pdd_poly1_coeffs_c[node_name].value = c1
                m.pdd_poly1_coeffs_d[node_name].value = d1
                m.pdd_poly2_coeffs_a[node_name].value = a2
                m.pdd_poly2_coeffs_b[node_name].value = b2
                m.pdd_poly2_coeffs_c[node_name].value = c2
                m.pdd_poly2_coeffs_d[node_name].value = d2
            else:
                m.pdd_poly1_coeffs_a[node_name] = aml.Param(a1)
                m.pdd_poly1_coeffs_b[node_name] = aml.Param(b1)
                m.pdd_poly1_coeffs_c[node_name] = aml.Param(c1)
                m.pdd_poly1_coeffs_d[node_name] = aml.Param(d1)
                m.pdd_poly2_coeffs_a[node_name] = aml.Param(a2)
                m.pdd_poly2_coeffs_b[node_name] = aml.Param(b2)
                m.pdd_poly2_coeffs_c[node_name] = aml.Param(c2)
                m.pdd_poly2_coeffs_d[node_name] = aml.Param(d2)

            updater.add(node, 'minimum_pressure', pdd_poly_coeffs_param.update)
            updater.add(node, 'nominal_pressure', pdd_poly_coeffs_param.update)