added by default for nit_sot `n_steps` as number of steps

Now scan requires the user to say the number of steps. In case of outputs that do not feed anything in, if the user does not provide any information then it is assumed that you want all intermediate steps.

added by default for nit_sot `n_steps` as number of steps
97ba0f6b · Razvan Pascanu · e8158504 · 97ba0f6b
--- a/theano/sandbox/scan.py
+++ b/theano/sandbox/scan.py
@@ -172,8 +172,8 @@ def scan(fn,
                outs_info[i]['taps'] = [-1]
        else:
            # if a None is provided as the output info we replace it
-            # with an empty dict() to simplify handling
+            # with an dict(steps=n_steps) to simplify handling
-            outs_info[i] = dict()
+            outs_info[i] = dict(steps=n_steps)
    ##
    ###   Step 2. Generate inputs and outputs of the inner functions
@@ -481,7 +481,7 @@ def scan(fn,
        n_outs = len(dummy_f.maker.outputs)
        if as_while:
            n_outs = n_outs - 1
-        outs_info = [dict() for x in xrange(n_outs)]
+            outs_info = [dict('steps':n_steps) for x in xrange(n_outs)]
    ## Step 5.1 Outputs with taps different then -1