Add dlrm_v2 CPU FP8 QDQ example

examples/3.x_api/pytorch/recommendation/dlrm_v2/fp8_quant/cpu/README.md

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+Step-by-Step
+============
+
+This document describes the step-by-step instructions for FP8 quantization for [DLRM v2](https://github.com/facebookresearch/dlrm/tree/main/torchrec_dlrm) with Intel® Neural Compressor.
+
+
+# Prerequisite
+
+### 1. Environment
+
+```shell
+bash steup.sh
+pip install -r requirements.txt
+```
+
+### 2. Prepare Dataset
+
+You can download preprocessed dataset by following
+https://github.com/mlcommons/inference/tree/master/recommendation/dlrm_v2/pytorch#download-preprocessed-dataset
+
+
+### 3. Prepare pretrained model
+
+You can download and unzip checkpoint by following
+https://github.com/mlcommons/inference/tree/master/recommendation/dlrm_v2/pytorch#downloading-model-weights
+
+
+# Run with CPU
+
+```shell
+TORCHINDUCTOR_FREEZING=1 python main.py --model_path /path/to/model_weights --data_path /path/to/dataset --calib --quant --accuracy
+```
+or only do quantization after calibration is done
+```shell
+TORCHINDUCTOR_FREEZING=1 python main.py --model_path /path/to/model_weights --data_path /path/to/dataset  --quant --accuracy
+```
+

examples/3.x_api/pytorch/recommendation/dlrm_v2/fp8_quant/cpu/data_process/dlrm_dataloader.py

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+#
+# -*- coding: utf-8 -*-
+#
+# Copyright (c) 2025 Intel Corporation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+#!/usr/bin/env python3
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+import argparse
+import os
+from typing import List
+
+from torch import distributed as dist
+from torch.utils.data import DataLoader
+from torchrec.datasets.criteo import (
+    CAT_FEATURE_COUNT,
+    DAYS,
+    DEFAULT_CAT_NAMES,
+    DEFAULT_INT_NAMES,
+    InMemoryBinaryCriteoIterDataPipe,
+)
+from torchrec.datasets.random import RandomRecDataset
+
+# OSS import
+try:
+    # pyre-ignore[21]
+    # @manual=//ai_codesign/benchmarks/dlrm/torchrec_dlrm/data:multi_hot_criteo
+    from data.multi_hot_criteo import MultiHotCriteoIterDataPipe
+
+except ImportError:
+    pass
+
+# internal import
+try:
+    from .multi_hot_criteo import MultiHotCriteoIterDataPipe  # noqa F811
+except ImportError:
+    pass
+
+STAGES = ["train", "val", "test"]
+
+
+def _get_random_dataloader(
+    args: argparse.Namespace,
+    stage: str,
+) -> DataLoader:
+    attr = f"limit_{stage}_batches"
+    num_batches = getattr(args, attr)
+    if stage in ["val", "test"] and args.test_batch_size is not None:
+        batch_size = args.test_batch_size
+    else:
+        batch_size = args.batch_size
+    return DataLoader(
+        RandomRecDataset(
+            keys=DEFAULT_CAT_NAMES,
+            batch_size=batch_size,
+            hash_size=args.num_embeddings,
+            hash_sizes=(
+                args.num_embeddings_per_feature
+                if hasattr(args, "num_embeddings_per_feature")
+                else None
+            ),
+            manual_seed=args.seed if hasattr(args, "seed") else None,
+            ids_per_feature=1,
+            num_dense=len(DEFAULT_INT_NAMES),
+            num_batches=num_batches,
+        ),
+        batch_size=None,
+        batch_sampler=None,
+        pin_memory=args.pin_memory,
+        num_workers=0,
+    )
+
+
+def _get_in_memory_dataloader(
+    args: argparse.Namespace,
+    stage: str,
+) -> DataLoader:
+    dir_path = args.data_path
+    sparse_part = "sparse_multi_hot.npz"
+    datapipe = MultiHotCriteoIterDataPipe
+
+    if stage == "train":
+        stage_files: List[List[str]] = [
+            [os.path.join(dir_path, f"day_{i}_dense.npy") for i in range(DAYS - 1)],
+            [os.path.join(dir_path, f"day_{i}_{sparse_part}") for i in range(DAYS - 1)],
+            [os.path.join(dir_path, f"day_{i}_labels.npy") for i in range(DAYS - 1)],
+        ]
+    elif stage in ["val", "test"]:
+        stage_files: List[List[str]] = [
+            [os.path.join(dir_path, f"day_{DAYS-1}_dense.npy")],
+            [os.path.join(dir_path, f"day_{DAYS-1}_{sparse_part}")],
+            [os.path.join(dir_path, f"day_{DAYS-1}_labels.npy")],
+        ]
+    if stage in ["val", "test"] and args.test_batch_size is not None:
+        batch_size = args.test_batch_size
+    else:
+        batch_size = args.batch_size
+    dataloader = DataLoader(
+        datapipe(
+            stage,
+            *stage_files,  # pyre-ignore[6]
+            batch_size=batch_size,
+            rank=0,  #  dist.get_rank(),
+            world_size=1,  #  dist.get_world_size(),
+            drop_last=args.drop_last_training_batch if stage == "train" else False,
+            shuffle_batches=args.shuffle_batches,
+            shuffle_training_set=args.shuffle_training_set,
+            shuffle_training_set_random_seed=args.seed,
+            mmap_mode=args.mmap_mode,
+            hashes=(
+                args.num_embeddings_per_feature
+                if args.num_embeddings is None
+                else ([args.num_embeddings] * CAT_FEATURE_COUNT)
+            ),
+        ),
+        batch_size=None,
+        pin_memory=args.pin_memory,
+        collate_fn=lambda x: x,
+    )
+    return dataloader
+
+
+def get_dataloader(args: argparse.Namespace, backend: str, stage: str) -> DataLoader:
+    """
+    Gets desired dataloader from dlrm_main command line options. Currently, this
+    function is able to return either a DataLoader wrapped around a RandomRecDataset or
+    a Dataloader wrapped around an InMemoryBinaryCriteoIterDataPipe.
+
+    Args:
+        args (argparse.Namespace): Command line options supplied to dlrm_main.py's main
+            function.
+        backend (str): "nccl" or "gloo".
+        stage (str): "train", "val", or "test".
+
+    Returns:
+        dataloader (DataLoader): PyTorch dataloader for the specified options.
+
+    """
+    stage = stage.lower()
+    if stage not in STAGES:
+        raise ValueError(f"Supplied stage was {stage}. Must be one of {STAGES}.")
+
+    args.pin_memory = (
+        (backend == "nccl") if not hasattr(args, "pin_memory") else args.pin_memory
+    )
+
+    return _get_in_memory_dataloader(args, stage)