Method simplify

src/shape_transform_descriptor.cpp:1002–1031

}

void dimension::simplify()
{
    if(subdimensions.size() < 2)
        return;
    remove_1_sub_dims(subdimensions);
    // Flatten adjacent dimensions
    adjacent_for_each(subdimensions.begin(), subdimensions.end(), [&](sub& d1, sub& d2) {
        if(d1.origin_axis().size() < 2)
            return;
        if(d2.origin_axis().size() < 2)
            return;
        if(d1.has_hidden_axis() != d2.has_hidden_axis())
            return;
        if(not std::equal(d1.origin_axis().begin(),
                          d1.origin_axis().end() - 1,
                          d2.origin_axis().begin(),
                          d2.origin_axis().end() - 1))
            return;
        auto a1 = d1.origin_axis().back();
        auto a2 = d2.origin_axis().back();
        assert(a2 != a1);
        if(a2 <= a1)
            return;
        if((a2 - a1) != 1)
            return;
        d2.len = d1.len * d2.len;
        d1.len = 1;
    });
    remove_1_sub_dims(subdimensions);
}

// Search all subdimensions and return the subdimensions vector, an iterator
// to the subdimension found and an optional iterator to the previous