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    "# Providing Data - Level 3\n",
    "## Directory-based vs. Percentage-based dataset splits\n",
    "When we don't provide a `model_inputs.validate` key, then we'll use the dataset defined in `train` and the percentages defined in `data_set.train_size`, `data_set.validate_size` and `data_set.test_size` to define percentage or absolute number splits.\n",
    "\n",
    "## Defining what data to use for inference\n",
    "Introduce `model_inputs.infer` as the way to define what data is provided to the model during inference.\n",
    "\n",
    "## Requesting multi-modal data\n",
    "\n",
    "In this notebook we'll see how to request data from multiple data sources using multiple ``HyraxDataset``s.\n",
    "\n",
    "To do so we'll start with ``model_inputs`` data request. "
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