future.graph.merge_hierarchical

[Juan Nunez-Iglesias]

Hey Michael,

I don't understand your question. Why are you traversing the graph "each
time"? Vighnesh only traverses it once?

Juan.

On Sun, Sep 20, 2015 at 6:55 AM bricklemacho at gmail.com <
bricklemacho at gmail.com> wrote:

> Hi Vighnesh,
>
> I am struggling with both Python and the graph stuff, hope you can help
> me.  I have taken discussion off list.
>
> I am using your idea in your blog:  Hierarchical Merging In Action.
> Similar to your seg_list[] concept, I plan to store a copy of the merged
> regions in a list.  The best place appears to be at bottom of the while
> loop in merge_hierarchical (about line 130 in graph_merge.py).   Default
> plan is to duplicate Lines 132-136 of graph_merge.py to create a label map:
>
> label_map = np.arange(labels.max() + 1)
> for ix, (n, d) in enumerate(rag.nodes_iter(data=True)):
>     for label in d['labels']:
>          label_map[label] = ix
>
> Seems bit of an overkill to traverse the entire graph each time.   Is
> there any other way you can suggest?    All I need is a label map that
> consists of two labels, one being the merged region and everything else
> grouped/labeled as another region.
>
> Any help appreciated.
>
> Regards,
>
> Michael.
> --
>
>
> On 19/09/2015 11:51 am, Vighnesh Birodkar wrote:
>
> Hello
>
> I am sorry, I was mistaken, there is no way of getting the merge sequence
> right now without changing the source.
>
> Thanks
>
>
> On Fri, Sep 18, 2015 at 9:46 PM, bricklemacho at gmail.com <
> bricklemacho at gmail.com> wrote:
>
>> Hi,
>>
>> My graph theory is pretty weak so I may be missing something obvious.
>> Can you elaborate a little more on your suggestion below.
>>
>> Are you saying the setting in_place=False, will the graph then retain a
>> copy of the intermediate steps?  If so how do I access these intermediate
>> steps?
>>
>> Playing around with RAG Merging example (from the skimage gallery).  If
>> set rag_copy=True,  I will have the starting graph, and can use the labels
>> returned from merge_hierarchical to see the result of final merge, but I
>> can't see way to review the intermediate steps.
>>
>> Any help appreciated,
>>
>> Michael.
>> --
>>
>> On 18/09/2015 10:30 pm, Vighnesh Birodkar wrote:
>>
>> Hi
>>
>> Using in _ place = False, couldn't you get the entire sequence of merging
>> from the root node ?
>> On 17 Sep 2015 12:59, "bricklemacho at gmail.com" <bricklemacho at gmail.com>
>> wrote:
>>
>>> Setting the threshold to infinity will merge everything, but in what
>>> order are the nodes merged?
>>>
>>> Assuming setting threshold to infinity works,  I still need to save a
>>> copy of each merge.  Any suggestions?
>>>
>>> Regards,
>>>
>>> Michael.
>>> --
>>>
>>> On 17/09/2015 11:23 pm, Vighnesh Birodkar wrote:
>>>
>>>> Hello
>>>>
>>>> Rather than creating an alternative method, you could always set the
>>>> threshold to infinity. Won't that work in your case ?
>>>>
>>>> Thanks
>>>> Vighnesh
>>>>
>>>>
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