Move DataCollatorForMultipleChoice from the docs to the package (#34763)

* Add implementation for DataCollatorForMultipleChoice based on docs.

* Add DataCollatorForMultipleChoice to import structure.

* Remove custom DataCollatorForMultipleChoice implementations from example scripts.

* Remove custom implementations of DataCollatorForMultipleChoice from docs in English, Spanish, Japanese and Korean.

* Refactor torch version of DataCollatorForMultipleChoice to be more easily understandable.

* Apply suggested changes and run make fixup.

* fix copies, style and fixup

* add missing documentation

* nits

* fix docstring

* style

* nits

* isort

---------

Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>
Co-authored-by: Arthur Zucker <arthur.zucker@gmail.com>

examples/research_projects/lxmert/demo.ipynb

@@ -23,21 +23,18 @@
     }
    ],
    "source": [
-    "from IPython.display import clear_output, Image, display\n",
-    "import PIL.Image\n",
     "import io\n",
-    "import json\n",
-    "import torch\n",
+    "\n",
     "import numpy as np\n",
+    "import PIL.Image\n",
+    "from IPython.display import Image, display\n",
+    "from modeling_frcnn import GeneralizedRCNN\n",
     "from processing_image import Preprocess\n",
     "from visualizing_image import SingleImageViz\n",
-    "from modeling_frcnn import GeneralizedRCNN\n",
-    "from utils import Config\n",
+    "\n",
     "import utils\n",
     "from transformers import LxmertForQuestionAnswering, LxmertTokenizer\n",
-    "import wget\n",
-    "import pickle\n",
-    "import os\n",
+    "from utils import Config\n",
     "\n",
     "\n",
     "# URL = \"https://raw.githubusercontent.com/airsplay/py-bottom-up-attention/master/demo/data/images/input.jpg\",\n",

examples/research_projects/movement-pruning/Saving_PruneBERT.ipynb

@@ -31,19 +31,19 @@
    "source": [
     "# Includes\n",
     "\n",
-    "import h5py\n",
-    "import os\n",
     "import json\n",
+    "import os\n",
     "from collections import OrderedDict\n",
     "\n",
-    "from scipy import sparse\n",
+    "import h5py\n",
     "import numpy as np\n",
-    "\n",
     "import torch\n",
+    "from scipy import sparse\n",
     "from torch import nn\n",
     "\n",
     "from transformers import *\n",
     "\n",
+    "\n",
     "os.chdir(\"../../\")"
    ]
   },