title: how to update prophet model with new data added to the old data set? I tried the tutorial but I get errors
body: <p>So I tried the one in FbProphet tutorial website:</p>
  <p><a href="https://facebook.github.io/prophet/docs/additional_topics.html#updating-fitted-models" rel="nofollow noreferrer">https://facebook.github.io/prophet/docs/additional_topics.html#updating-fitted-models</a></p>
  <p>I got this error: <strong>RuntimeError: mismatch in dimension declared and found in context; processing stage=initialization; variable name=beta; position=0; dims declared=(14); dims found=(49)</strong></p>
  <p>Even though the updated data frame is the same as the old one, just few more rows.</p>
  <p>I also tried what was told here: <a href="https://github.com/facebook/prophet/issues/46" rel="nofollow noreferrer">https://github.com/facebook/prophet/issues/46</a></p>
  <p>Same error. I tried the following:</p>
  <p>m = Prophet(interval_width=0.95, weekly_seasonality=True, daily_seasonality=True, yearly_seasonality=True)</p>
  <p>m.fit(df)</p>
  <p>m2 = Prophet(interval_width=0.95, weekly_seasonality=True, daily_seasonality=True, yearly_seasonality=True)</p>
  <p>model2 = m2.fit(df_and2Days,init=m.params)</p>
  <p>I got a new error: <strong>RuntimeError: mismatch in number dimensions declared and found in context; processing stage=initialization; variable name=k; dims declared=(); dims found=(1,1)</strong></p>
  <p>It seems like it's a dimension problem, any help would be appreciated! Thanks</p>