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from typing import Any, Dict, List, Union |
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import torch |
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import torch.nn as nn |
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from loguru import logger |
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from omegaconf import OmegaConf |
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from yolo.tools.layer_helper import get_layer_map |
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class YOLO(nn.Module): |
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""" |
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A preliminary YOLO (You Only Look Once) model class still under development. |
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Parameters: |
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model_cfg: Configuration for the YOLO model. Expected to define the layers, |
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parameters, and any other relevant configuration details. |
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""" |
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def __init__(self, model_cfg: Dict[str, Any]): |
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super(YOLO, self).__init__() |
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self.nc = model_cfg["nc"] |
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self.layer_map = get_layer_map() |
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self.build_model(model_cfg.model) |
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def build_model(self, model_arch: Dict[str, List[Dict[str, Dict[str, Dict]]]]): |
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model_list = nn.ModuleList() |
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output_dim = [3] |
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layer_indices_by_tag = {} |
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for arch_name in model_arch: |
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logger.info(f"🏗️ Building model-{arch_name}") |
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for layer_idx, layer_spec in enumerate(model_arch[arch_name], start=1): |
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layer_type, layer_info = next(iter(layer_spec.items())) |
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layer_args = layer_info.get("args", {}) |
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source = layer_info.get("source", -1) |
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output = layer_info.get("output", False) |
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if isinstance(source, str): |
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source = layer_indices_by_tag[source] |
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if "Conv" in layer_type: |
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layer_args["in_channels"] = output_dim[source] |
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if "Detect" in layer_type: |
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layer_args["nc"] = self.nc |
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layer_args["ch"] = [output_dim[idx] for idx in source] |
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layer = self.create_layer(layer_type, source, output, **layer_args) |
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model_list.append(layer) |
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if "tags" in layer_info: |
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if layer_info["tags"] in layer_indices_by_tag: |
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raise ValueError(f"Duplicate tag '{layer_info['tags']}' found.") |
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layer_indices_by_tag[layer_info["tags"]] = layer_idx |
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out_channels = self.get_out_channels(layer_type, layer_args, output_dim, source) |
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output_dim.append(out_channels) |
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self.model = model_list |
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def forward(self, x): |
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y = [x] |
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output = [] |
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for layer in self.model: |
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if OmegaConf.is_list(layer.source): |
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model_input = [y[idx] for idx in layer.source] |
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else: |
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model_input = y[layer.source] |
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x = layer(model_input) |
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y.append(x) |
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if layer.output: |
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output.append(x) |
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return output |
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def get_out_channels(self, layer_type: str, layer_args: dict, output_dim: list, source: Union[int, list]): |
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if "Conv" in layer_type: |
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return layer_args["out_channels"] |
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if layer_type in ["Pool", "UpSample"]: |
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return output_dim[source] |
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if layer_type == "Concat": |
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return sum(output_dim[idx] for idx in source) |
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if layer_type == "IDetect": |
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return None |
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def create_layer(self, layer_type: str, source: Union[int, list], output=False, **kwargs): |
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if layer_type in self.layer_map: |
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layer = self.layer_map[layer_type](**kwargs) |
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layer.source = source |
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layer.output = output |
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return layer |
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else: |
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raise ValueError(f"Unsupported layer type: {layer_type}") |
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def get_model(model_cfg: dict) -> YOLO: |
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"""Constructs and returns a model from a Dictionary configuration file. |
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Args: |
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config_file (dict): The configuration file of the model. |
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Returns: |
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YOLO: An instance of the model defined by the given configuration. |
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""" |
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OmegaConf.set_struct(model_cfg, False) |
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model = YOLO(model_cfg) |
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logger.info("✅ Success load model") |
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return model |
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if __name__ == "__main__": |
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model_cfg = load_model_cfg("v7-base") |
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YOLO(model_cfg) |
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