model : Granite docling + Idefics3 preprocessing (SmolVLM) (#16206)

* feat: Add granite-docling conversion using trillion pretokenizer

Branch: gabe-l-hart/GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* feat: Add granite-docling vocab pre enum

Branch: gabe-l-hart/GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* fix: Use granite-docling pre

Branch: gabe-l-hart/GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* feat: Add clip_is_idefics3

Branch: gabe-l-hart/GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* feat: Allow multi-token boundary sequences for image templating

Branch: gabe-l-hart/GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* feat: Add tiling support for idefices3 in clip.cpp

This should likely be moved into llava_uhd::get_slice_instructions, but for
now this avoids disrupting the logic there.

Branch: gabe-l-hart/GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* feat: Partial support for full templating for idefics3 in mtmd

There are still errors encoding some of the image chunks, but the token
sequence now matches transformers _almost_ perfectly, except for the double
newline before the global image which shows up as two consecutive newline
tokens instead of a single double-newline token. I think this is happening
because the blocks are tokenized separately then concatenated.

Branch: gabe-l-hart/GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* feat: Fully working image preprocessing for idefics3 w/ resize and slicing

Branch: gabe-l-hart/GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* feat: Parse the preprocessor config's longest side and add it to the mmproj hparams

Branch: GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* fix: Use the longest side instead of size * scale_factor

For Granite Docling, these come out to the same value, but that was just a
conicidence.

Branch: GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* fix: Allow batch encoding and remove clip_is_idefics3

Branch: GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* refactor: Remove unnecessary conditionals for empty token vectors

Branch: GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* refactor: Use image_manipulation util

Branch: GraniteDocling

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

* add test model

---------

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>
Co-authored-by: Xuan Son Nguyen <son@huggingface.co>

tools/mtmd/clip-impl.h

@@ -31,6 +31,7 @@
 
 // vision-specific
 #define KEY_IMAGE_SIZE          "clip.vision.image_size"
+#define KEY_PREPROC_IMAGE_SIZE  "clip.vision.preproc_image_size"
 #define KEY_PATCH_SIZE          "clip.vision.patch_size"
 #define KEY_IMAGE_MEAN          "clip.vision.image_mean"
 #define KEY_IMAGE_STD           "clip.vision.image_std"