cleaned_data returning empty in formsets

The following snippet is returning an empty dictionary for the 2nd form:

 

dct = {'form-0-attachment': u'',
 'form-0-id': u'1',
 'form-0-name': u'1',
 'form-1-attachment': u'',
 'form-1-id': u'2',
 'form-1-name': u'2',
 'form-INITIAL_FORMS': u'1',
 'form-MAX_NUM_FORMS': u'1000',
 'form-TOTAL_FORMS': 2}
PictureFormSet = formset_factory(PictureForm)
picture_formset = PictureFormSet(dct, None,
                                 initial = [ model_to_dict(a) for a in Picture.objects.filter(pk__in = [1,2])])
for form in picture_formset.forms:
    if form.is_valid():
        print form.cleaned_data
        print '-------------------'
Output:
{'id': 1, 'name': u'1', 'attachment': None}
-------------------
{}
-------------------

How does initial work with data= in a formset?  Without the initial, there will be cleaned data for the 2nd form.

I'm trying to use self.changed_data in my form to determine whether which value has changed.

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