* hidden decorator kwargs in DataProvider.__init__
* also add unit test for this.

Change float in test_ConvTrans and test_ConvUnify to real.

The chunks of types in excluded_chunk_types will not be counted in
ChunkEvaluator. This is useful for tasks such as SRL, in which chunks of
type V (verb) will not be taken into account in evaluation.

reference or raw matrix (Matrix & or Matrix *)
contextProjectionForward
contextProjectionBackward
contextProjectionBackwardData
contextProjectionBackwardWeight
classificationError
The mul functions would be updated later.

* The DataProvider should be INCREF every time.

Change-Id: I2b58c8d854aa31096a6b6e49c1c120f7acec622b

Make sure the input size is correct.

Change-Id: I2559075e32a098c5ed51942ff8351d964a6d6c75

Change-Id: I2b58c8d854aa31096a6b6e49c1c120f7acec622b