如何控制 fbprophet 的输出？

Question

我希望能够在拟合预测模型的同时抑制来自 fbprophet 的一些输出。此输出（“初始对数联合概率...”、“优化正常终止：”、“检测到收敛：...”等）显然来自 Stan 的 cpp 代码，我找不到任何明显的方法来控制它[我正在使用 python 接口]。深入研究代码发现，verbose=False 作为高级 stan() 例程（在 pystan/api.py 中）中的默认值，但显然此参数不会抑制此打印输出。不修改代码是否可行？

Answer 1

不幸的是，它比它应该的更复杂。我认为一些输出来自 C 或 Fortran 编译代码或其他东西。这是您的操作方法（在此处找到）：

import os
import sys

import pandas as pd
from fbprophet import Prophet


# from /sf/ask/779110951/
class suppress_stdout_stderr(object):
    '''
    A context manager for doing a "deep suppression" of stdout and stderr in
    Python, i.e. will suppress all print, even if the print originates in a
    compiled C/Fortran sub-function.
       This will not suppress raised exceptions, since exceptions are printed
    to stderr just before a script exits, and after the context manager has
    exited (at least, I think that is why it lets exceptions through).

    '''
    def __init__(self):
        # Open a pair of null files
        self.null_fds = [os.open(os.devnull, os.O_RDWR) for x in range(2)]
        # Save the actual stdout (1) and stderr (2) file descriptors.
        self.save_fds = (os.dup(1), os.dup(2))

    def __enter__(self):
        # Assign the null pointers to stdout and stderr.
        os.dup2(self.null_fds[0], 1)
        os.dup2(self.null_fds[1], 2)

    def __exit__(self, *_):
        # Re-assign the real stdout/stderr back to (1) and (2)
        os.dup2(self.save_fds[0], 1)
        os.dup2(self.save_fds[1], 2)
        # Close the null files
        os.close(self.null_fds[0])
        os.close(self.null_fds[1])

m = Prophet()
df = pd.read_csv('somefile.csv')

with suppress_stdout_stderr():
    m.fit(minimal_df)

“更简单”的方式（如果它行得通，那行不通）应该是这样的：

import os
import sys

import pandas as pd
from fbprophet import Prophet

m = Prophet()
df = pd.read_csv('somefile.csv')

orig_out = sys.stdout
sys.stdout = open(os.devnull, 'w')
m.fit(df)
sys.stdout = orig_out