Bug or Mistake? [SOLVED]

[Uwe]

Hello,

I got a message from rapid-miner I don't understand.
The input data for the Extract Average Element is an emty set, so maybe it's that.
On the one hand I am confused because the message/expception covers a casting problem (see log below).
On the other hand it's difficult to understand because there is a handle exception element around the failed subprocess.

Jan 11, 2012 2:46:12 PM SEVERE: Process failed: operator cannot be executed (com.rapidminer.operator.IOObjectCollection cannot be cast to com.rapidminer.operator.valueseries.ValueSeries). Check the log messages...
Jan 11, 2012 2:46:12 PM SEVERE: Here:           Process[1] (Process)
           subprocess 'Main Process'
             +- Read MSSQL 2008 publn[1] (Read Database)
             +- Store[1] (Store)
             +- Read MSSQL 2008 citn[1] (Read Database)
             +- Store (2)[1] (Store)
             +- pat_publn_retrieve[1] (Retrieve)
             +- Collect[1] (Collect)
             +- Multiply (5)[1] (Multiply)
             +- Append (3)[1] (Append)
             +- Loop p in patent[1] (Loop Examples)
           subprocess 'Example Process'
             |     +- Retrieve[1] (Retrieve)
             |     +- Rename[1] (Rename)
             |     +- load esPatentSummaryDates (2)[1] (Handle Exception)
           subprocess 'Try'
             |     |  |  +- load esPatentSummaryDates[1] (Recall)
           subprocess 'Catch'
             |     +- Extract Macro[1] (Extract Macro)
             |     +- Filter Examples[1] (Filter Examples)
             |     +- Join[1] (Join)
             |     +- Handle Exception[1] (Handle Exception)
           subprocess 'Try'
             |     |  |  +- for pc in pcs (2)[1] (Loop Examples)
           subprocess 'Example Process'
             |     |  |        +- load esPatentCitationDates (3)[0] (Handle Exception)
           subprocess 'Try'
             |     |  |        |  |  +- load esPatentCitationDates (4)[0] (Recall)
           subprocess 'Catch'
             |     |  |        +- Extract Macro (3)[0] (Extract Macro)
             |     |  |        +- Filter Examples (3)[0] (Filter Examples)
             |     |  |        +- Multiply (6)[0] (Multiply)
             |     |  |        +- Select Attributes (4)[0] (Select Attributes)
             |     |  |        +- Select Attributes (5)[0] (Select Attributes)
             |     |  |        +- Generate ID (3)[0] (Generate ID)
             |     |  |        +- Generate ID (4)[0] (Generate ID)
             |     |  |        +- Join (3)[0] (Join)
             |     |  |        +- Generate Attributes (2)[0] (Generate Attributes)
             |     |  |        +- Select Attributes (6)[0] (Select Attributes)
             |     |  |        +- Collect (5)[0] (Collect)
             |     |  |        +- Append (4)[0] (Append)
             |     |  |        +- Multiply (7)[0] (Multiply)
             |     |  |        +- Collect (6)[0] (Collect)
             |     |  |        +- save esPatentCitationDates (2)[0] (Remember)
           subprocess 'Catch'
             |     |     +- Set Macro[0] (Set Macro)
             |     +- Print to Console[1] (Print to Console)
       ==>   |     +- Extract Average[1] (Extract Average)
             |     +- Append[0] (Append)
             |     +- Multiply (3)[0] (Multiply)
             |     +- Multiply (4)[0] (Multiply)
             |     +- save esPatentSummaryDates[0] (Remember)
             +- Collect (4)[0] (Collect)
             +- Extract Average (2)[0] (Extract Average)

if the input is not an empty set thereI got another message :
Jan 11, 2012 3:18:04 PM SEVERE: Process failed: operator cannot be executed (com.rapidminer.example.set.SimpleExampleSet cannot be cast to com.rapidminer.operator.valueseries.ValueSeries).
This message makes sense.

Thanks for your help!

[Marius]

Hi Uwe,

the Extract Average operator is part of the Value Series extension and only capable of handling Value Series. You however passed an IOObjectCollection to it (probably you see a double line connected to the operator in the process). It would be handy if you had posted your process, so we could give you a more detailed answer. If you intended to calculate the average performance, you should you the Average operator instead of Extract Average.

Best, Marius

[Uwe]

Hi Marius,

thx for your answer.
the average operator requires in my opinion 2 different sets, but in the given example i will get the arithmetic mean value for a list off values.

I got a solution for my problem, but I had to reorganize the process.

I wish you a nice  day.

Uwe