Using LSTM's on Multivariate Input AND Multivariate Output












0












$begingroup$


I have a very small dataset, only about 40 rows, that has historical usage data for a few categories (roughly 20). I strongly suspect that these categories are dependent in a partial-zero-sum-game fashion: if the usage of one category goes up, I'm expecting that of another to go down. My goal is to predict the next row of all categories.



I've looked at this post, but it's not predicting multiple variables. I also looked at this post, but it's still univariate output (albeit multiple time steps) and multivariate input. So far, I've been basing my approach on the typical LSTM post here at machinelearningmastery, but it's also a single-output-variable example, and a number of the functions used, such as scaler.inverse_transform don't appear to broadcast very well. I'm even having difficulties trying to scale back my full example to match his!



Any tips for scaling LSTM's up to multivariate output? Can the keras LSTM do this natively? If so, how would the code change?



Thanks for your time!






python keras time-series predictive-modeling lstm







share|improve this question









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    0












    $begingroup$


    I have a very small dataset, only about 40 rows, that has historical usage data for a few categories (roughly 20). I strongly suspect that these categories are dependent in a partial-zero-sum-game fashion: if the usage of one category goes up, I'm expecting that of another to go down. My goal is to predict the next row of all categories.



    I've looked at this post, but it's not predicting multiple variables. I also looked at this post, but it's still univariate output (albeit multiple time steps) and multivariate input. So far, I've been basing my approach on the typical LSTM post here at machinelearningmastery, but it's also a single-output-variable example, and a number of the functions used, such as scaler.inverse_transform don't appear to broadcast very well. I'm even having difficulties trying to scale back my full example to match his!



    Any tips for scaling LSTM's up to multivariate output? Can the keras LSTM do this natively? If so, how would the code change?



    Thanks for your time!






    python keras time-series predictive-modeling lstm







    share|improve this question









    $endgroup$















      0












      0








      0





      $begingroup$


      I have a very small dataset, only about 40 rows, that has historical usage data for a few categories (roughly 20). I strongly suspect that these categories are dependent in a partial-zero-sum-game fashion: if the usage of one category goes up, I'm expecting that of another to go down. My goal is to predict the next row of all categories.



      I've looked at this post, but it's not predicting multiple variables. I also looked at this post, but it's still univariate output (albeit multiple time steps) and multivariate input. So far, I've been basing my approach on the typical LSTM post here at machinelearningmastery, but it's also a single-output-variable example, and a number of the functions used, such as scaler.inverse_transform don't appear to broadcast very well. I'm even having difficulties trying to scale back my full example to match his!



      Any tips for scaling LSTM's up to multivariate output? Can the keras LSTM do this natively? If so, how would the code change?



      Thanks for your time!






      python keras time-series predictive-modeling lstm







      share|improve this question









      $endgroup$




      I have a very small dataset, only about 40 rows, that has historical usage data for a few categories (roughly 20). I strongly suspect that these categories are dependent in a partial-zero-sum-game fashion: if the usage of one category goes up, I'm expecting that of another to go down. My goal is to predict the next row of all categories.



      I've looked at this post, but it's not predicting multiple variables. I also looked at this post, but it's still univariate output (albeit multiple time steps) and multivariate input. So far, I've been basing my approach on the typical LSTM post here at machinelearningmastery, but it's also a single-output-variable example, and a number of the functions used, such as scaler.inverse_transform don't appear to broadcast very well. I'm even having difficulties trying to scale back my full example to match his!



      Any tips for scaling LSTM's up to multivariate output? Can the keras LSTM do this natively? If so, how would the code change?



      Thanks for your time!






      python keras time-series predictive-modeling lstm




      python keras time-series predictive-modeling lstm






      share|improve this question













      share|improve this question











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      share|improve this question










      asked 7 hours ago









      Adrian KeisterAdrian Keister

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      3641315






















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          $begingroup$

          You can simply change the number of units at the last layer if you want to predict multiple outputs (or just said differently, one output with multiple features). For example from the link you shared, you can change the units of the Dense layer:



          model = Sequential()
          
model.add(LSTM(50, input_shape=(train_X.shape[1], train_X.shape[2])))
          
model.add(Dense(2))
          
model.compile(loss='mae', optimizer='adam')


          The above model would now predict the next step of an output with 2 "features".
          Note that you output should be of shape num_samplesx2 now.






          share|improve this answer










          New contributor




          SaTa is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.






          $endgroup$













          • $begingroup$
            You wrote, "The above model would not predict..." Did you mean "The above model would now predict..."?
            $endgroup$
            – Adrian Keister
            6 hours ago










          • $begingroup$
            Yes, thanks. I edited the answer.
            $endgroup$
            – SaTa
            6 hours ago










          • $begingroup$
            Ah, gotcha. Thanks! I wouldn't have bothered, but it did change the meaning of the sentence a fair bit. I'll try it out!
            $endgroup$
            – Adrian Keister
            6 hours ago










          • $begingroup$
            Yes, it certainly does :).
            $endgroup$
            – SaTa
            6 hours ago






          • 1




            $begingroup$
            num_samples is like how many samples you have for training. num_observations is how long is each sample, or how many time steps you have in each sample.
            $endgroup$
            – SaTa
            5 hours ago











          Your Answer





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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          1












          $begingroup$

          You can simply change the number of units at the last layer if you want to predict multiple outputs (or just said differently, one output with multiple features). For example from the link you shared, you can change the units of the Dense layer:



          model = Sequential()
          
model.add(LSTM(50, input_shape=(train_X.shape[1], train_X.shape[2])))
          
model.add(Dense(2))
          
model.compile(loss='mae', optimizer='adam')


          The above model would now predict the next step of an output with 2 "features".
          Note that you output should be of shape num_samplesx2 now.






          share|improve this answer










          New contributor




          SaTa is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.






          $endgroup$













          • $begingroup$
            You wrote, "The above model would not predict..." Did you mean "The above model would now predict..."?
            $endgroup$
            – Adrian Keister
            6 hours ago










          • $begingroup$
            Yes, thanks. I edited the answer.
            $endgroup$
            – SaTa
            6 hours ago










          • $begingroup$
            Ah, gotcha. Thanks! I wouldn't have bothered, but it did change the meaning of the sentence a fair bit. I'll try it out!
            $endgroup$
            – Adrian Keister
            6 hours ago










          • $begingroup$
            Yes, it certainly does :).
            $endgroup$
            – SaTa
            6 hours ago






          • 1




            $begingroup$
            num_samples is like how many samples you have for training. num_observations is how long is each sample, or how many time steps you have in each sample.
            $endgroup$
            – SaTa
            5 hours ago
















          1












          $begingroup$

          You can simply change the number of units at the last layer if you want to predict multiple outputs (or just said differently, one output with multiple features). For example from the link you shared, you can change the units of the Dense layer:



          model = Sequential()
          
model.add(LSTM(50, input_shape=(train_X.shape[1], train_X.shape[2])))
          
model.add(Dense(2))
          
model.compile(loss='mae', optimizer='adam')


          The above model would now predict the next step of an output with 2 "features".
          Note that you output should be of shape num_samplesx2 now.






          share|improve this answer










          New contributor




          SaTa is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.






          $endgroup$













          • $begingroup$
            You wrote, "The above model would not predict..." Did you mean "The above model would now predict..."?
            $endgroup$
            – Adrian Keister
            6 hours ago










          • $begingroup$
            Yes, thanks. I edited the answer.
            $endgroup$
            – SaTa
            6 hours ago










          • $begingroup$
            Ah, gotcha. Thanks! I wouldn't have bothered, but it did change the meaning of the sentence a fair bit. I'll try it out!
            $endgroup$
            – Adrian Keister
            6 hours ago










          • $begingroup$
            Yes, it certainly does :).
            $endgroup$
            – SaTa
            6 hours ago






          • 1




            $begingroup$
            num_samples is like how many samples you have for training. num_observations is how long is each sample, or how many time steps you have in each sample.
            $endgroup$
            – SaTa
            5 hours ago














          1












          1








          1





          $begingroup$

          You can simply change the number of units at the last layer if you want to predict multiple outputs (or just said differently, one output with multiple features). For example from the link you shared, you can change the units of the Dense layer:



          model = Sequential()
          
model.add(LSTM(50, input_shape=(train_X.shape[1], train_X.shape[2])))
          
model.add(Dense(2))
          
model.compile(loss='mae', optimizer='adam')


          The above model would now predict the next step of an output with 2 "features".
          Note that you output should be of shape num_samplesx2 now.






          share|improve this answer










          New contributor




          SaTa is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.






          $endgroup$



          You can simply change the number of units at the last layer if you want to predict multiple outputs (or just said differently, one output with multiple features). For example from the link you shared, you can change the units of the Dense layer:



          model = Sequential()
          
model.add(LSTM(50, input_shape=(train_X.shape[1], train_X.shape[2])))
          
model.add(Dense(2))
          
model.compile(loss='mae', optimizer='adam')


          The above model would now predict the next step of an output with 2 "features".
          Note that you output should be of shape num_samplesx2 now.







          share|improve this answer










          New contributor




          SaTa is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          share|improve this answer



          share|improve this answer








          edited 6 hours ago





















          New contributor




          SaTa is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          answered 6 hours ago









          SaTaSaTa

          112




          112




          New contributor




          SaTa is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.





          New contributor





          SaTa is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.






          SaTa is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.












          • $begingroup$
            You wrote, "The above model would not predict..." Did you mean "The above model would now predict..."?
            $endgroup$
            – Adrian Keister
            6 hours ago










          • $begingroup$
            Yes, thanks. I edited the answer.
            $endgroup$
            – SaTa
            6 hours ago










          • $begingroup$
            Ah, gotcha. Thanks! I wouldn't have bothered, but it did change the meaning of the sentence a fair bit. I'll try it out!
            $endgroup$
            – Adrian Keister
            6 hours ago










          • $begingroup$
            Yes, it certainly does :).
            $endgroup$
            – SaTa
            6 hours ago






          • 1




            $begingroup$
            num_samples is like how many samples you have for training. num_observations is how long is each sample, or how many time steps you have in each sample.
            $endgroup$
            – SaTa
            5 hours ago


















          • $begingroup$
            You wrote, "The above model would not predict..." Did you mean "The above model would now predict..."?
            $endgroup$
            – Adrian Keister
            6 hours ago










          • $begingroup$
            Yes, thanks. I edited the answer.
            $endgroup$
            – SaTa
            6 hours ago










          • $begingroup$
            Ah, gotcha. Thanks! I wouldn't have bothered, but it did change the meaning of the sentence a fair bit. I'll try it out!
            $endgroup$
            – Adrian Keister
            6 hours ago










          • $begingroup$
            Yes, it certainly does :).
            $endgroup$
            – SaTa
            6 hours ago






          • 1




            $begingroup$
            num_samples is like how many samples you have for training. num_observations is how long is each sample, or how many time steps you have in each sample.
            $endgroup$
            – SaTa
            5 hours ago
















          $begingroup$
          You wrote, "The above model would not predict..." Did you mean "The above model would now predict..."?
          $endgroup$
          – Adrian Keister
          6 hours ago




          $begingroup$
          You wrote, "The above model would not predict..." Did you mean "The above model would now predict..."?
          $endgroup$
          – Adrian Keister
          6 hours ago












          $begingroup$
          Yes, thanks. I edited the answer.
          $endgroup$
          – SaTa
          6 hours ago




          $begingroup$
          Yes, thanks. I edited the answer.
          $endgroup$
          – SaTa
          6 hours ago












          $begingroup$
          Ah, gotcha. Thanks! I wouldn't have bothered, but it did change the meaning of the sentence a fair bit. I'll try it out!
          $endgroup$
          – Adrian Keister
          6 hours ago




          $begingroup$
          Ah, gotcha. Thanks! I wouldn't have bothered, but it did change the meaning of the sentence a fair bit. I'll try it out!
          $endgroup$
          – Adrian Keister
          6 hours ago












          $begingroup$
          Yes, it certainly does :).
          $endgroup$
          – SaTa
          6 hours ago




          $begingroup$
          Yes, it certainly does :).
          $endgroup$
          – SaTa
          6 hours ago




          1




          1




          $begingroup$
          num_samples is like how many samples you have for training. num_observations is how long is each sample, or how many time steps you have in each sample.
          $endgroup$
          – SaTa
          5 hours ago




          $begingroup$
          num_samples is like how many samples you have for training. num_observations is how long is each sample, or how many time steps you have in each sample.
          $endgroup$
          – SaTa
          5 hours ago


















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