Пример #1
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def initialize(context):    
     #Schedule a function'rebalance', to run once a month
    schedule_function(schedule,
                      date_rules.month_start(),
                      time_rules.market_open(hours=0, minutes=3))
    attach_pipeline(make_pipeline(), 'my_pipeline')
    attach_pipeline(risk_loading_pipeline(), 'risk_factors')
Пример #2
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def initialize(context):
    context.day_count = 0
    context.daily_message = "Day {}"
    context.weekly_message = "Time to place some trades" 
    
    context.max_leverage = 1.0
    context.max_position_size = 0.015
    context.max_turnover = 0.95
    
    
    algo.attach_pipeline(
        make_pipeline(), 
        'data_pipe'
    )
    
    algo.attach_pipeline(
        risk_loading_pipeline(), 
        'risk_pipe'
    )
    
    algo.schedule_function(
        rebalance, 
        date_rule = algo.date_rules.week_start(),
        time_rule = algo.time_rules.market_open()
    )
Пример #3
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def initialize(context):
    """
    Called once at the start of the algorithm.
    """
    # Rebalance every Monday when the market opens
    algo.schedule_function(
        rebalance,
        algo.date_rules.week_start(),
        algo.time_rules.market_open(),
    )

    # Record tracking variables at the end of each day.
    algo.schedule_function(
        record_vars,
        algo.date_rules.every_day(),
        algo.time_rules.market_close(),
    )

    # Set constraints
    context.max_leverage = 1.0
    context.max_pos_size = 0.015
    context.max_turnover = 0.95

    # Create our dynamic stock selector.
    algo.attach_pipeline(make_pipeline(), 'pipeline')
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_pipeline')
def initialize(context):
    # Here we set our slippage and commisions. Set slippage
    # and commission to zero to evaulate the signal-generating
    # ability of the algorithm independent of these additional
    # costs.
    set_commission(commission.PerShare(cost=0.0, min_trade_cost=0))
    set_slippage(slippage.VolumeShareSlippage(volume_limit=1, price_impact=0))
    context.spy = sid(8554)

    algo.attach_pipeline(make_pipeline(), 'long_short_equity_template')

    # attach the pipeline for the risk model factors that we
    # want to neutralize in the optimization step
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_factors')

    # Schedule my rebalance function
    schedule_function(func=rebalance,
                      date_rule=date_rules.every_day(),
                      time_rule=time_rules.market_open(hours=0, minutes=30),
                      half_days=True)
    # record my portfolio variables at the end of day
    schedule_function(func=recording_statements,
                      date_rule=date_rules.every_day(),
                      time_rule=time_rules.market_close(),
                      half_days=True)
Пример #5
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def initialize(context):
    """
    Called once at the start of the algorithm.
    """
    set_slippage(slippage.FixedSlippage(spread=0.00))
    set_commission(commission.PerShare(cost=0, min_trade_cost=0))

    schedule_function(rebalance_portfolio, TRADE_FREQ,
                      time_rules.market_open(minutes=1))

    # Record tracking variables at the end of each day.
    schedule_function(log_metrics, date_rules.every_day(),
                      time_rules.market_close())

    # Set up universe
    # base_universe = AverageDollarVolume(window_length=63, mask=QTradableStocksUS()).percentile_between(80, 100)
    universe = AverageDollarVolume(
        window_length=63, mask=QTradableStocksUS()).percentile_between(40, 60)

    # create alpha factors and machine learning pipline
    ml_pipeline = make_ml_pipeline(alpha_factors=make_alpha_factors(),
                                   universe=universe,
                                   lookback=TRAINING_PERIOD,
                                   lookahead=HOLDING_PERIOD)
    attach_pipeline(ml_pipeline, 'alpha_model')

    attach_pipeline(risk_loading_pipeline(), 'risk_loading_pipeline')

    context.past_predictions = {}
    context.realized_rmse = 0
    context.realized_ic = 0
    context.long_short_spread = 0
Пример #6
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def initialize(context):
    """
    バックテスト開始時に呼び出される、アルゴリズムの中心となるメイン関数を、Quantopianでは
    initialize関数と呼びます。
    パラメータ
    ----------
    context : アルゴリズムコンテキスト
        バックテストの状態を保存するために用いられるオブジェクト。
        contextは、initialize, before_trading_start, handle_data, scedule_functionから呼び
        出される全ての関数に渡されます。
        contextは現在のポジションに関する情報を回収ために用いることのできるポートフォリオ特性を提供します。
    """

    # パイプラインをアルゴリズムに取り込む(notebookでいうところのrun_pipelineに相当)
    # run_pipelineと違うのは、start_dateとend_dateが引数に存在しない点!
    algo.attach_pipeline(make_pipeline(), 'long_short_equity_template')

    # リスクモデルのファクターを構成するパイプラインをアルゴリズムに取り込む
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_factors')

    # アルゴリズムの動作スケジュールを決定(ポートフォリオのリバランスを【週次】実行している)
    algo.schedule_function(func=rebalance,
                           date_rule=algo.date_rules.week_start(),
                           time_rule=algo.time_rules.market_open(hours=0,
                                                                 minutes=30),
                           half_days=True)

    # アルゴリズムの動作スケジュールを決定(ポートフォリオの状態を営業日終了時点で評価)
    algo.schedule_function(func=record_vars,
                           date_rule=algo.date_rules.every_day(),
                           time_rule=algo.time_rules.market_close(),
                           half_days=True)
Пример #7
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def initialize(context):
    # SPY capital, EFA fondos, TIP bonos, GSG indince. 
    context.security_list = symbols('SPY', 'EFA','TIP','GSG')
    context.classifier = KNeighborsClassifier(n_neighbors=7, weights='uniform', algorithm='kd_tree') # Usar un clasificador KNN
    
   #Parametros de restriccion   
    # Attach de pileine datos
    attach_pipeline(
        make_pipeline(),
        'data_pipe'
    )
    
    attach_pipeline(
        risk_loading_pipeline(),
        'risk_pipe'
    )

    # Rebalance 2 horas de abrir el mercado
    algo.schedule_function(
        rebalance,
        algo.date_rules.month_end(),
        algo.time_rules.market_open(hours=2),
    )

    # guardar al cierre todos los dias
    algo.schedule_function(
        record_vars,
        algo.date_rules.every_day(),
        algo.time_rules.market_close()
    )

    # crea el conjunto seleccionado
    algo.attach_pipeline(make_pipeline(), 'pipeline')
Пример #8
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def initialize(context):
    """
    A core function called automatically once at the beginning of a backtest.

    Use this function for initializing state or other bookkeeping.

    Parameters
    ----------
    context : AlgorithmContext
        An object that can be used to store state that you want to maintain in 
        your algorithm. context is automatically passed to initialize, 
        before_trading_start, handle_data, and any functions run via schedule_function.
        context provides the portfolio attribute, which can be used to retrieve information 
        about current positions.
    """

    algo.attach_pipeline(make_pipeline(), 'long_short_equity_template')

    # Attach the pipeline for the risk model factors that we
    # want to neutralize in the optimization step. The 'risk_factors' string is
    # used to retrieve the output of the pipeline in before_trading_start below.
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_factors')

    # Schedule our rebalance function
    algo.schedule_function(func=rebalance,
                           date_rule=algo.date_rules.week_start(),
                           time_rule=algo.time_rules.market_open(hours=0,
                                                                 minutes=30),
                           half_days=True)

    # Record our portfolio variables at the end of day
    algo.schedule_function(func=record_vars,
                           date_rule=algo.date_rules.every_day(),
                           time_rule=algo.time_rules.market_close(),
                           half_days=True)
Пример #9
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def initialize(context):

    universe = QTradableStocksUS()
    sector = Sector()
    momentum = Momentum()
    pipe = Pipeline()
    pipe.add(sector, 'sector')
    
    # ALPHA
    asset_turnover = Fundamentals.assets_turnover.latest.winsorize(.05, .95).zscore()
    ciwc = Fundamentals.change_in_working_capital.latest.winsorize(.05, .95).zscore()

    alpha = (asset_turnover + ciwc).rank().demean()
    pipe.add(alpha, 'alpha')
    
    # BETA
    beta = RollingLinearRegressionOfReturns(target=sid(8554),
                                            returns_length=5,
                                            regression_length=252,
                                            mask=alpha.notnull() & Sector().notnull()
                                            ).beta                    
    pipe.add(beta, 'beta')
    
    # REGISTER PIPELINES
    # ------------------
    attach_pipeline(pipe, 'pipe')
    attach_pipeline(risk_loading_pipeline(), 'risk_loading_pipeline')
    pipe.set_screen(alpha.notnull() & Sector().notnull() & beta.notnull() & universe & (momentum>0))
    
    # SCHEDULE FUNCTIONS
    # ------------------   
    schedule_function(rebalance, 
                      date_rule=date_rules.every_day(), 
                      time_rule=time_rules.market_open(minutes=10))
Пример #10
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def initialize(context):
    """
    Called once at the start of the algorithm.
    """
    set_benchmark(symbol('SPY'))
    set_commission(commission.PerTrade(cost=0.0))
    set_slippage(slippage.VolumeShareSlippage(volume_limit=1, price_impact=0))
    set_long_only()
    # set_max_leverage(1.1)

    # Rebalance every day, 1 hour after market open.
    algo.schedule_function(
        rebalance,
        algo.date_rules.every_day(),
        algo.time_rules.market_open(hours=1),
    )

    # Record tracking variables at the end of each day.
    algo.schedule_function(
        record_vars,
        algo.date_rules.every_day(),
        algo.time_rules.market_close(),
    )

    # Create our dynamic stock selector.
    algo.attach_pipeline(make_pipeline(), 'piotroski')
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_factors')
Пример #11
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def initialize(context):

    algo.schedule_function(rebalance, algo.date_rules.week_start(),
                           time_rules.market_open())

    algo.schedule_function(recordo, date_rules.every_day(),
                           time_rules.market_close())

    algo.attach_pipeline(make_pipeline(), 'my_pipeline')
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_factors')
Пример #12
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def initialize(context):

    # DEFINE UNIVERSE
    # ------------------
    universe = QTradableStocksUS()

    # ALPHA GENERATION
    # ----------------
    # COMPUTE Z SCORES: ASSET TURNOVER AND CHANGE IN WORKING CAPITAL
    # BOTH ARE FUNDAMENTAL VALUE MEASURES

    asset_turnover = Fundamentals.assets_turnover.latest.winsorize(
        .05, .95).zscore()
    ciwc = Fundamentals.change_in_working_capital.latest.winsorize(
        .05, .95).zscore()

    # ALPHA COMBINATION
    # -----------------
    # ASSIGN EVERY ASSET AN ALPHA RANK AND CENTER VALUES AT 0 (DEMEAN).
    alpha = (asset_turnover + 2 * ciwc).rank().demean()

    # BETA DEFINITION
    beta = 0.66 * RollingLinearRegressionOfReturns(
        target=sid(8554),
        returns_length=5,
        regression_length=252,
        mask=alpha.notnull() & Sector().notnull()).beta + 0.33 * 1.0

    # CREATE AND REGISTER PIPELINE
    #-------------------------------
    # COMPUTES COMBINES ALPHA AND SECTOR CODE FOR UNIVERSE OF STOCKS TO BE USED IN OPTIMIZATION
    pipe = Pipeline(
        columns={
            'alpha': alpha,
            'sector': Sector(),
            'beta': beta,
        },
        # RETURN ONLY "NOT NULL" VALUES IN OUR PIPELINE
        screen=alpha.notnull() & Sector().notnull() & beta.notnull()
        & universe,
    )

    # LOAD ALL PIPELINES
    algo.attach_pipeline(pipe, 'pipe')
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_loading_pipeline')

    # SCHEDULE FUNCTIONS
    #--------------------
    algo.schedule_function(
        do_portfolio_construction,
        date_rule=algo.date_rules.week_start(),
        time_rule=algo.time_rules.market_open(minutes=10),
        half_days=False,
    )
def initialize(context):
    algo.attach_pipeline(make_pipeline(), 'long_short_equity_template')
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_factors')
    algo.schedule_function(func=rebalance,
                           date_rule=algo.date_rules.week_start(),
                           time_rule=algo.time_rules.market_open(hours=0,
                                                                 minutes=30),
                           half_days=True)
    algo.schedule_function(func=record_vars,
                           date_rule=algo.date_rules.every_day(),
                           time_rule=algo.time_rules.market_close(),
                           half_days=True)
Пример #14
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def initialize(context):
    # Constraint parameters
    context.max_leverage = 1.0
    context.max_short_pos_size = 0.03
    context.max_long_pos_size = 0.03
    context.max_turnover = 0.95

    # Attach data pipelines
    attach_pipeline(make_pipeline(), 'data_pipe')
    attach_pipeline(risk_loading_pipeline(), 'risk_pipe')

    # Schedule rebalance function
    schedule_function(rebalance, date_rules.week_start(),
                      time_rules.market_open())
Пример #15
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def initialize(context):

    algo.attach_pipeline(make_pipeline(), 'long_short_equity_template')
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_factors')

    algo.schedule_function(func=rebalance,
                           date_rule=algo.date_rules.week_start(),
                           time_rule=algo.time_rules.market_close(),
                           half_days=False)

    # Record our portfolio variables at the end of day
    algo.schedule_function(func=record_vars,
                           date_rule=algo.date_rules.every_day(),
                           time_rule=algo.time_rules.market_close(),
                           half_days=True)
Пример #16
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def initialize(context):
    context.max_leverage = 1.0
    context.max_pos_size = 0.015
    context.max_turnover = 0.95
    
    algo.attach_pipeline(
        make_pipeline(), 'data_pipe')
    
    algo.attach_pipeline(
        risk_loading_pipeline(), 'risk_pipe'
    )
    
    algo.schedule_function(
        rebalance,
        date_rule = algo.date_rules.week_start(),
        time_rule = algo.time_rules.market_open()
    )
Пример #17
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def initialize(context):
    attach_pipeline(make_pipeline(), 'long_short_equity_template')
    attach_pipeline(risk_loading_pipeline(), 'risk_loading_pipeline')

    # Schedule my rebalance function
    schedule_function(func=rebalance,
                      date_rule=date_rules.every_day(),
                      time_rule=time_rules.market_open(minutes=60),
                      half_days=True)
    # record my portfolio variables at the end of day
    schedule_function(func=recording_statements,
                      date_rule=date_rules.every_day(),
                      time_rule=time_rules.market_close(),
                      half_days=True)

    set_commission(commission.PerShare(cost=0, min_trade_cost=0))
    set_slippage(slippage.FixedSlippage(spread=0))
Пример #18
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def initialize(context):
    # Restricciones &&
    context.max_lever = 1.2
    context.max_posTam = 0.025
    # Volumen de Negocios
    context.max_Volum = 0.85

    # adjunta la informacion de pipelines
    attach_pipeline(make_pipeline(),'data_pipe')
    attach_pipeline(risk_loading_pipeline(),'risk_pipe')

    # llama la funcion rebalance cada dia, 15 minutos despues que el mercado abre
    schedule_function(
        rebalance,
        date_rules.week_start(),
        time_rules.market_open(minutes=15),
    )
Пример #19
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def initialize(context):
    # 制約パラメータ

    context.max_leverage = 1.0
    context.max_pos_size = 0.015
    context.max_turnover = 0.95

    # data pipelines を取り付ける
    algo.attach_pipeline(make_pipeline(), 'data_pipe')
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_pipe')

    # rebalance 関数をスケジュール
    algo.schedule_function(
        rebalance,
        algo.date_rules.week_start(),
        algo.time_rules.market_open(),
    )
Пример #20
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def initialize(context):

    context.spy = sid(8554)

    attach_pipeline(make_pipeline(), 'long_short_equity_template')
    # Attach the risk loading pipeline to our algorithm.
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_loading_pipeline')

    # Schedule my rebalance function
    schedule_function(func=rebalance,
                      date_rule=date_rules.every_day(),
                      time_rule=time_rules.market_open(hours=0, minutes=30),
                      half_days=True)
    # record my portfolio variables at the end of day
    schedule_function(func=recording_statements,
                      date_rule=date_rules.every_day(),
                      time_rule=time_rules.market_close(),
                      half_days=True)
Пример #21
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def initialize(context):
    """
    Called once at the start of the algorithm.
    """
    #This is for the trend following filter
    context.spy = sid(8554)
    context.TF_filter = False
    context.TF_lookback = 126
    # Attach the risk loading pipeline to our algorithm.
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_loading_pipeline')
    algo.attach_pipeline(make_pipeline(), 'pipe')
    # Schedule a function, 'do_portfolio_construction', to run once a week
    # ten minutes after market open.
    algo.schedule_function(
        do_portfolio_construction,
        date_rule=algo.date_rules.week_start(),
        time_rule=algo.time_rules.market_open(minutes=MINUTES_AFTER_OPEN_TO_TRADE),
        half_days=False,
    )
Пример #22
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def initialize(context):

    algo.attach_pipeline(make_pipeline(), 'long_short_equity_template')

    # Attach the pipeline for the risk model factors that we
    # want to neutralize in the optimization step. The 'risk_factors' string is 
    # used to retrieve the output of the pipeline in before_trading_start below.
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_factors')

    # Schedule our rebalance function
    algo.schedule_function(func=rebalance,
                           date_rule=algo.date_rules.every_day(),
                           time_rule=algo.time_rules.market_open(hours=0, minutes=30),
                           half_days=True)
    # Record our portfolio variables at the end of day
    algo.schedule_function(func=record_vars,
                           date_rule=algo.date_rules.every_day(),
                           time_rule=algo.time_rules.market_close(),
                           half_days=True)
def initialize(context):
    attach_pipeline(risk_loading_pipeline(), 'risk_loading_pipeline')
    attach_pipeline(beta_pipeline(), 'beta_pipeline')
    attach_pipeline(factor_pipeline(), 'factor_pipeline')

    # Schedule my rebalance function
    schedule_function(func=rebalance,
                      date_rule=date_rules.every_day(),
                      time_rule=time_rules.market_open(minutes=60),
                      half_days=True)
    # record my portfolio variables at the end of day
    schedule_function(func=recording_statements,
                      date_rule=date_rules.every_day(),
                      time_rule=time_rules.market_close(),
                      half_days=True)

    context.init = True

    context.combined_alpha = pd.Series()
Пример #24
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def initialize(context):
    context.max_pos_size = 0.01
    context.max_turnover = 0.95
    context.holdings = 10
    context.profit_taking = 20
    context.max_loss = -20
    context.max_leverage = 1
    set_slippage(slippage.FixedSlippage(spread=0.00))

    schedule_function(monthly_rebalance, date_rules.month_end(),
                      time_rules.market_open(hours=5))  #5 is 8%

    pipe = Pipeline()

    attach_pipeline(pipe, 'ranked_stocks')

    attach_pipeline(risk_loading_pipeline(), 'risk_pipe')

    market_cap_filter = market_cap()
    stocks = market_cap_filter.top(3000)
    total_filter = (stocks)
    pipe.set_screen(total_filter)

    m_factor1 = momentum_factor_1()
    pipe.add(m_factor1, 'factor_1')
    m_factor2 = momentum_factor_2()
    pipe.add(m_factor2, 'factor_2')
    m_factor_3 = stddev_factor()
    pipe.add(m_factor_3, 'factor_3')

    m_factor1_rank = m_factor1.rank(mask=total_filter, ascending=False)
    m_factor2_rank = m_factor2.rank(mask=total_filter, ascending=False)
    m_factor_3_rank = m_factor_3.rank(mask=total_filter, ascending=True)

    pipe.add(m_factor1_rank, 'f1_rank')
    pipe.add(m_factor2_rank, 'f2_rank')
    pipe.add(m_factor_3_rank, 'f3_rank')

    #should put weighted adding instead
    combo_raw = (m_factor1_rank + m_factor2_rank + m_factor_3_rank) / 3
    pipe.add(combo_raw, 'combo_raw')
    pipe.add(combo_raw.rank(mask=total_filter), 'combo_rank')
Пример #25
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def initialize(context):

    # Agregar tuberia
    algo.attach_pipeline(make_pipeline(), 'long_short_equity_template')

    # Agregar tuberia de riesgo
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_factors')

    # Agregar función programada de rebalanceo
    algo.schedule_function(func=rebalance,
                           date_rule=algo.date_rules.week_start(),
                           time_rule=algo.time_rules.market_open(hours=0,
                                                                 minutes=30),
                           half_days=True)

    # Agregar función programada de registro de variables
    algo.schedule_function(func=record_vars,
                           date_rule=algo.date_rules.every_day(),
                           time_rule=algo.time_rules.market_close(),
                           half_days=True)
Пример #26
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def initialize(context):

    set_slippage(slippage.FixedSlippage(spread=0.05))
    algo.attach_pipeline(make_pipeline(), 'pipeline')
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_factors')

    #Schedule Functions
    schedule_function(trade, date_rules.week_start(2),
                      time_rules.market_close(minutes=30))
    schedule_function(trade_bonds, date_rules.month_end(),
                      time_rules.market_close(minutes=20))

    #This is for the trend following filter
    context.spy = sid(8554)
    context.TF_filter = False
    context.TF_lookback = 126

    #Set number of securities to buy and bonds fund (when we are out of stocks)
    context.Target_securities_to_buy = 20.0
    context.bonds = sid(23870)
Пример #27
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def initialize(context):
    """
    Called once at the start of the algorithm.
    """
    set_slippage(slippage.FixedSlippage(spread=0.00))
    set_commission(commission.PerShare(cost=0, min_trade_cost=0))

    schedule_function(
        rebalance,
        TRADE_FREQ,
        time_rules.market_open(minutes=1),
    )

    # Record tracking variables at the end of each day.
    schedule_function(
        record_vars,
        date_rules.every_day(),
        time_rules.market_close(),
    )

    # Set up universe, alphas and ML pipline
    context.universe = QTradableStocksUS()
    # if you are using IsAnnouncedAcqTarget, uncomment the next line
    # context.universe &= IsAnnouncedAcqTarget()

    ml_pipeline = make_ml_pipeline(
        context.universe,
        n_forward_days=PRED_N_FORWARD_DAYS,
        window_length=ML_TRAINING_WINDOW,
    )
    # Create our dynamic stock selector.
    attach_pipeline(ml_pipeline, 'alpha_model')
    # Add the risk pipeline
    attach_pipeline(risk_loading_pipeline(), 'risk_factors')

    context.past_predictions = {}
    context.hold_out_accuracy = 0
    context.hold_out_log_loss = 0
    context.hold_out_returns_spread_bps = 0
def initialize(context):
    # Rebalance every day, after market close
    algo.schedule_function(rebalance, algo.date_rules.every_day(),
                           algo.time_rules.market_close(hours=1))

    if NO_COST:
        set_commission(commission.PerShare(cost=0, min_trade_cost=0))
        set_slippage(
            slippage.FixedBasisPointsSlippage(basis_points=0,
                                              volume_limit=0.1))

    # Record tracking variables at the end of each day.
    algo.schedule_function(
        record_vars,
        algo.date_rules.every_day(),
        algo.time_rules.market_close(),
    )

    # Create our dynamic stock selector.
    algo.attach_pipeline(make_pipeline(), 'pipeline')

    algo.attach_pipeline(risk_loading_pipeline(), 'risk_loading_pipeline')
Пример #29
0
def initialize(context):
    
    # Rebalance every day, 1 hour after market open.
    algo.schedule_function(
        rebalance,
        algo.date_rules.every_day(),
        algo.time_rules.market_open(hours=1),
    )

    # contrains to the contest
    context.max_posTam = 0.045
    context.max_lever = 0.97

    # Record tracking variables at the end of each day.
    algo.schedule_function(
        record_vars,
        algo.date_rules.every_day(),
        algo.time_rules.market_close(),
    )

    # Create our dynamic stock selector.
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_loading_pipeline')
    algo.attach_pipeline(make_pipeline(), 'pipeline')
Пример #30
0
    Parameters
    ----------
    context : AlgorithmContext
        An object that can be used to store state that you want to maintain in 
        your algorithm. context is automatically passed to initialize, 
        before_trading_start, handle_data, and any functions run via schedule_function.
        context provides the portfolio attribute, which can be used to retrieve information 
        about current positions.
    """
    
    algo.attach_pipeline(make_pipeline(), 'long_short_equity_template')
 
    # Attach the pipeline for the risk model factors that we
    # want to neutralize in the optimization step. The 'risk_factors' string is 
    # used to retrieve the output of the pipeline in before_trading_start below.
    algo.attach_pipeline(risk_loading_pipeline(), 'risk_factors')
 
    # Schedule our rebalance function
    algo.schedule_function(func=rebalance,
                           date_rule=algo.date_rules.month_start(days_offset = 3),
                           time_rule=algo.time_rules.market_close(hours=0, minutes=30),
                           half_days=True)
 
    # Record our portfolio variables at the end of day
    algo.schedule_function(func=record_vars,
                           date_rule=algo.date_rules.every_day(),
                           time_rule=algo.time_rules.market_close(),
                           half_days=True)
    
def make_pipeline():
    """