TashaSkyUp-EternalKernelPytorchNodes/pytorch_nodes.py

import torch
import folder_paths
import torchvision
import torch.nn as nn
import functools
import torch
import json

try:
    from .config import config_settings
except ImportError as e:
    from config import config_settings

NODE_CLASS_MAPPINGS = {}
NODE_DISPLAY_NAME_MAPPINGS = {}


def ETK_pytorch_base(cls):
    cls.CATEGORY = "ETK/pytorch"
    # Add spaces to the camel case class name
    pretty_name = cls.__name__
    for i in range(1, len(pretty_name)):
        if pretty_name[i].isupper():
            pretty_name = pretty_name[:i] + " " + pretty_name[i:]
    cls.DISPLAY_NAME = pretty_name
    NODE_CLASS_MAPPINGS[cls.__name__] = cls
    NODE_DISPLAY_NAME_MAPPINGS[cls.DISPLAY_NAME] = pretty_name

    # Wrap the function defined in the FUNCTION attribute
    func_name = getattr(cls, "FUNCTION", None)
    if func_name and hasattr(cls, func_name):
        original_func = getattr(cls, func_name)

        @functools.wraps(original_func)
        def wrapped_func(*args, **kwargs):
            with torch.inference_mode(False):
                return original_func(*args, **kwargs)

        setattr(cls, func_name, wrapped_func)

    return cls


@ETK_pytorch_base
class PyTorchDatasetDownloader:
    # Define the input types for the node
    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "dataset_name": ("STRING", {"default": "mnist"}),
                "download_path": ("STRING", {"default": "./data"}),
                "mode": (["dataset", "tensors", ],),
            }
        }

    # Define the return types
    RETURN_TYPES = ("TORCH_DATASET", "TORCH_TENSOR", "TORCH_TENSOR",)
    RETURN_NAMES = ("Full Dataset", "Features tensor", "labels tensor",)
    FUNCTION = "download_dataset"

    # Method to download the dataset
    def download_dataset(self, dataset_name, download_path, mode):
        from torchvision import datasets, transforms
        import torch.utils.data as data_utils

        # check if the dataset already exists at the download_path

        # Downloading the dataset
        if dataset_name.lower() == "mnist":
            exists = False
            try:
                dataset = datasets.MNIST(
                    root=download_path,
                    train=True,
                    transform=transforms.ToTensor(),
                    download=False
                )
                exists = True
            except:
                dataset = datasets.MNIST(
                    root=download_path,
                    train=True,
                    transform=transforms.ToTensor(),
                    download=True
                )
        else:
            raise ValueError("Unsupported dataset")

        if mode == "tensors":
            # Split dataset into inputs and labels tensors
            inputs_tensor, labels_tensor = self.split_dataset_if_labels_exist(dataset)

            # Return tensors
            return (None, inputs_tensor, labels_tensor,)
        else:
            return (dataset, None, None,)

    def split_dataset_if_labels_exist(self, dataset):
        try:
            item = dataset[0]
            if isinstance(item, tuple) and len(item) > 1:
                # Extract inputs and labels
                inputs = [data[0] for data in dataset]
                labels = [data[1] for data in dataset]

                return torch.stack(inputs), torch.tensor(labels)
            else:
                return dataset, None
        except (TypeError, IndexError):
            return dataset, None


@ETK_pytorch_base
class DatsetSplitter:
    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "dataset": ("TORCH_DATASET",),
            }
        }

    RETURN_TYPES = ("TORCH_DATASET", "TORCH_DATASET")
    RETURN_NAMES = ("train_ds", "val_ds")
    FUNCTION = "split_dataset"

    def split_dataset(self, dataset):
        import torch
        from torch.utils.data import DataLoader
        from torch.utils.data import random_split

        ds_len = len(dataset)
        val_ratio = 0.2
        # use random_split to create a validation set
        train_ds, val_ds = random_split(dataset, [int(ds_len * (1 - val_ratio)), int(ds_len * val_ratio)])

        # train_ds is now of type torch.utils.data.Dataset throw an error if it is not
        if not isinstance(train_ds, torch.utils.data.Dataset):
            raise TypeError("train_ds is not of type torch.utils.data.Dataset")

        # val_ds is now of type torch.utils.data.Dataset throw an error if it is not
        if not isinstance(val_ds, torch.utils.data.Dataset):
            raise TypeError("val_ds is not of type torch.utils.data.Dataset")

        return (train_ds, val_ds,)


@ETK_pytorch_base
class AddLinearLayerNode:
    @classmethod
    def INPUT_TYPES(s):
        return {
            "required": {
                "model": ("TORCH_MODEL",),
                "in_features": ("INT", {"min": 1}),
                "out_features": ("INT", {"min": 1}),
                "bias": ([True, False],),
                "initialization": (["default", "xavier_uniform", "xavier_normal"],),
                "dtype": (["float32", "float64", "float16", "int32", "int64", "int16", "int8", "uint8"],),
            }
        }

    RETURN_TYPES = ("TORCH_MODEL",)
    FUNCTION = "add_linear_layer"
    CATEGORY = "model"

    def add_linear_layer(self, model, in_features, out_features, bias=True, initialization="default", dtype="float32"):
        import torch
        # Create the new linear layer
        use_dtype = getattr(torch, dtype)

        new_linear_layer = nn.Linear(in_features, out_features, bias=bias, dtype=use_dtype)
        new_linear_layer.requires_grad_(True)

        # Initialize the weights if required
        if initialization == "xavier_uniform":
            nn.init.xavier_uniform_(new_linear_layer.weight)
        elif initialization == "xavier_normal":
            nn.init.xavier_normal_(new_linear_layer.weight)

        # Reconstruct the nn.Sequential model to include the new layer
        if isinstance(model, nn.Sequential):
            # layers = list(model.children())
            # layers.append(new_linear_layer)
            # new_model = nn.Sequential(*layers)
            model.insert(len(model), new_linear_layer)
        else:
            raise TypeError("The provided model is not a nn.Sequential model.")

        # Returning the modified model
        return (model,)


@ETK_pytorch_base
class AddSoftmaxLayerNode:
    """
    SOFTMAX is a function that turns a vector of K real values into a vector of K real values that sum to 1.
    """

    @classmethod
    def INPUT_TYPES(s):
        return {
            "required": {
                "model": ("TORCH_MODEL",),
                "dim": ("INT", {"min": 0}),
            },
            "optional": {
                "log_softmax": ([False, True],),
            }

        }

    RETURN_TYPES = ("TORCH_MODEL",)
    FUNCTION = "add_softmax_layer"
    CATEGORY = "model"

    def add_softmax_layer(self, model, dim, log_softmax=False):
        import torch
        # Create the new softmax layer
        if log_softmax:
            new_softmax_layer = nn.LogSoftmax(dim=dim)
        else:
            new_softmax_layer = nn.Softmax(dim=dim)

        # Reconstruct the nn.Sequential model to include the new layer
        if isinstance(model, nn.Sequential):
            # layers = list(model.children())
            # layers.append(new_linear_layer)
            # new_model = nn.Sequential(*layers)
            model.insert(len(model), new_softmax_layer)
        else:
            raise TypeError("The provided model is not a nn.Sequential model.")

        # Returning the modified model
        return (model,)


@ETK_pytorch_base
class SequentialModelProvider:
    # Define the input types for the node
    @classmethod
    def INPUT_TYPES(cls):
        # Inputs can be used to customize the default architecture
        return {
            "required": {
                "name": ("STRING", {"default": "sequential_model"}),
            }
        }

    FUNCTION = "provide_default_model"
    # Define the return types
    RETURN_TYPES = ("TORCH_MODEL",)

    # Method to provide the default sequential model
    def provide_default_model(self, name):
        # Logic to create the default sequential model based on input configuration
        model = nn.Sequential()

        return (model,)


@ETK_pytorch_base
class PyTorchInferenceNode:
    """
    allows users to perform inference using a pre-trained PyTorch model
    on a given tensor or dataset
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "model": ("TORCH_MODEL",),  # The pre-trained PyTorch model
            },
            "optional": {
                "input_data": ("TORCH_TENSOR",),  # The input data to perform inference on
                "dataset": ("TORCH_DATASET",),  # The dataset to perform inference on
            }
        }

    RETURN_TYPES = ("TORCH_TENSOR",)
    FUNCTION = "inference"

    def inference(self, model, input_data=None, dataset=None):
        # perform inference on the input data or dataset using the model
        # and return the output
        if input_data != None and dataset != None:
            raise ValueError("Only one of input_data or dataset can be provided")
        elif input_data is not None:
            x = input_data
        elif dataset is not None:
            x = dataset.dataset
            # prepare x so that it can be passed to the model
            # e.g. convert to torch.Tensor
            # avoid the error: ValueError: only one element tensors can be converted to Python scalars
            if isinstance(x, torch.utils.data.Dataset):
                x = next(iter(x))[0]
            elif isinstance(x, torch.utils.data.DataLoader):
                x = next(iter(x))[0]
            elif isinstance(x, torch.Tensor):
                pass



        else:
            raise ValueError("Either input_data or dataset must be provided")

        mdl_device = next(model.parameters()).device
        # check that x and the model are on the same device
        if x.device != mdl_device:
            x = x.to(mdl_device)
        output = model(x)
        return (output,)


@ETK_pytorch_base
class FlattenTensor:
    """
    allows users to flatten a tensor
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "input_data": ("TORCH_TENSOR",),  # The input data to perform inference on
            }
        }

    RETURN_TYPES = ("TORCH_TENSOR",)
    FUNCTION = "flatten"

    def flatten(self, input_data):
        # perform inference on the input data or dataset using the model
        # and return the output
        output = input_data.flatten()
        return (output,)


@ETK_pytorch_base
class FlattenDataset:
    """
    allows users to flatten a dataset
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "dataset": ("TORCH_DATASET",),  # The input data to perform inference on
            }
        }

    RETURN_TYPES = ("TORCH_TENSOR",)
    FUNCTION = "flatten"

    def flatten(self, dataset):
        # perform inference on the input data or dataset using the model
        # and return the output
        output = torch.flatten(dataset.data)
        return (output,)


@ETK_pytorch_base
class ReshapeTensor:
    """
    allows users to reshape a tensor
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "input_data": ("TORCH_TENSOR",),  # The input data to perform inference on
                "shape": ("STRING", {"default": "1, -1"}),
            }
        }

    RETURN_TYPES = ("TORCH_TENSOR",)
    FUNCTION = "reshape"

    def reshape(self, input_data, shape):
        # perform inference on the input data or dataset using the model
        # and return the output
        shape = tuple(map(int, shape.split(",")))
        output = input_data.reshape(shape)
        return (output,)


@ETK_pytorch_base
class ChangeTensorType:
    """
    allows users to change the type of a tensor
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "input_data": ("TORCH_TENSOR",),  # The input data to perform inference on
                "dtype": ("STRING", {"default": "torch.float32"}),
            }
        }

    RETURN_TYPES = ("TORCH_TENSOR",)
    FUNCTION = "change_type"

    def change_type(self, input_data, dtype):
        # perform inference on the input data or dataset using the model
        # and return the output
        dtype = eval(dtype)
        output = input_data.type(dtype)
        return (output,)


@ETK_pytorch_base
class TensorToList:
    """
    allows users to convert a tensor to a list
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "input_data": ("TORCH_TENSOR",),  # The input data to perform inference on
            }
        }

    RETURN_TYPES = ("LIST",)
    FUNCTION = "tolist"

    def tolist(self, input_data):
        # perform inference on the input data or dataset using the model
        # and return the output
        output = input_data.tolist()
        return (output,)


@ETK_pytorch_base
class SliceTensor:
    """
    allows users to slice a tensor
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "input_data": ("TORCH_TENSOR",),  # The input data to perform inference on
                "start": ("STRING", {"default": "0"}),
                "end": ("STRING", {"default": "5"}),
                "step": ("STRING", {"default": "1"}),
            }
        }

    RETURN_TYPES = ("TORCH_TENSOR",)
    FUNCTION = "slice"

    def slice(self, input_data, start, end, step):
        # perform inference on the input data or dataset using the model
        # and return the output
        start = int(start)
        end = int(end)
        step = int(step)
        output = input_data[start:end:step]
        return (output,)


@ETK_pytorch_base
class SaveModel:
    """
    allows users to save a model
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "model": ("TORCH_MODEL",),  # The input data to perform inference on
                "path": ("STRING", {"default": ".data/models/model.pt"}),
            }
        }

    RETURN_TYPES = ("STRING",)
    FUNCTION = "save"
    # define that this is an output
    OUTPUT_NODE = True

    def save(self, model, path):
        import os
        # perform inference on the input data or dataset using the model
        # and return the output
        # create the directory if it doesn't exist
        os.makedirs(os.path.dirname(path), exist_ok=True)
        torch.save(model, path)
        return (path,)

    @classmethod
    def IS_CHANGED(s, **kwargs):
        import hashlib
        data = str(kwargs)
        m = hashlib.sha256()
        m.update(data.encode("utf-8"))
        return m.digest().hex()


@ETK_pytorch_base
class LoadModel:
    """
    allows users to load a model
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "path": ("STRING", {"default": ".data/models/model.pt"}),
            }
        }

    RETURN_TYPES = ("TORCH_MODEL",)
    FUNCTION = "load"

    def load(self, path):
        # perform inference on the input data or dataset using the model
        # and return the output
        model = torch.load(path)
        return (model,)

    def IS_CHANGED(s, path):
        # get the date modified of the model at the folder_path
        import os
        import hashlib

        data = str(os.path.getmtime(path))
        data = f"{path} {data}"
        m = hashlib.sha256()
        m.update(data.encode("utf-8"))
        return m.digest().hex()


def optimizer_to(optim, device):
    for param in optim.state.values():
        # Not sure there are any global tensors in the state dict
        if isinstance(param, torch.Tensor):
            param.data = param.data.to(device)
            if param._grad is not None:
                param._grad.data = param._grad.data.to(device)
        elif isinstance(param, dict):
            for subparam in param.values():
                if isinstance(subparam, torch.Tensor):
                    subparam.data = subparam.data.to(device)
                    if subparam._grad is not None:
                        subparam._grad.data = subparam._grad.data.to(device)


@ETK_pytorch_base
class TrainModel:
    """
    allows users to train a model
    """

    @classmethod
    def INPUT_TYPES(cls):
        # iterate over tourch.nn tp fomd amy attributes that end in "Loss" and add them to the list
        loss_functions = []
        for attr in dir(torch.nn):
            if attr.endswith("Loss"):
                loss_functions.append(attr)

        return {

            "required": {
                "model": ("TORCH_MODEL",),

            },
            "optional": {
                "dataset": ("TORCH_DATASET",),
                "features tensor": ("TORCH_DATASET",),
                "labels tensor": ("TORCH_DATASET",),
                "epochs": ("INT", {"default": 1, "min": 1, "max": 2 ** 16}),
                "batch_size": ("INT", {"default": 1}),
                "loss_function": (loss_functions,),
                "optimizer": ("STRING", {"default": "torch.optim.SGD(model.parameters(), lr=0.001, momentum=0.9)"}),
                "metrics": ("STRING", {"default": "torch.nn.CrossEntropyLoss()"}),
                "device": ("STRING", {"default": "torch.device('cpu')"}),
                "create_samples": (["TRUE", "FALSE"], {"default": "FALSE"}),
            }
        }

    RETURN_TYPES = ("TORCH_MODEL", "LIST", "TORCH_MODEL")
    RETURN_NAMES = ("model", "metrics", "best model")
    FUNCTION = "train"

    def reset_optimizer_weights(self, optimizer):
        # Loop over the optimizer state
        for param_group in optimizer.param_groups:
            for param in param_group['params']:
                # Reset state dictionary for each parameter
                optimizer.state[param] = torch.optim.Optimizer.StateDict()

    def train(self, model, **kwargs):
        create_samples = kwargs.get("create_samples", "FALSE")
        if create_samples == "TRUE":
            create_samples = True
        else:
            create_samples = False

        with torch.inference_mode(False):
            train_dataset = kwargs.get("dataset", None)
            features_tensor = kwargs.get("features tensor", None)
            labels_tensor = kwargs.get("labels tensor", None)
            if train_dataset is None:
                if features_tensor is None or labels_tensor is None:
                    raise ValueError("Must provide either a dataset or features tensor and labels tensor")
                else:
                    train_dataset = torch.utils.data.TensorDataset(features_tensor, labels_tensor)

            epochs = kwargs.get("epochs", "1")
            batch_size = kwargs.get("batch_size", "1")
            loss_function = kwargs.get("loss_function", "torch.nn.CrossEntropyLoss()")
            optimizer = kwargs.get("optimizer", "torch.optim.SGD(model.parameters(), lr=0.001, momentum=0.9)")
            metrics = kwargs.get("metrics", "torch.nn.CrossEntropyLoss()")

            loss_function = eval(f"torch.nn.{loss_function}()")
            optimizer = eval(optimizer)

            metrics = eval(metrics)
            epochs = int(epochs)

            train_dataloader = torch.utils.data.DataLoader(train_dataset, batch_size=int(batch_size), shuffle=True,
                                                           num_workers=0)

            for param in model.parameters():
                param.requires_grad = True

            metrics_out = []
            device = kwargs.get("device", "torch.device('cpu')")

            e_device = eval(device)

            optimizer_to(optimizer, e_device)

            model.to(e_device)
            # train_dataloader.to(eval(device))
            model.train()
            torch.set_grad_enabled(True)
            # clear the cache do other things to free up memory
            torch.cuda.empty_cache()
            # set best_l to large value
            best_l = 1024 ** 3
            best_epoch = 0

            import uuid
            # get the env variable for the temp directory
            import os
            tmpdir = config_settings["tmp_dir"]
            tmp = os.path.join(tmpdir, str(uuid.uuid4()))

            for epoch in range(epochs):
                tot_loss = 0
                for batch_features, batch_labels in train_dataloader:
                    batch_features = batch_features.to(e_device)
                    batch_labels = batch_labels.to(e_device)
                    optimizer.zero_grad()
                    outputs = model(batch_features)
                    loss = loss_function(outputs, batch_labels)
                    tot_loss += loss.item()
                    loss.backward()
                    optimizer.step()
                print(f"Epoch {epoch} complete")
                l = metrics(outputs, batch_labels)
                metrics_out.append(l)
                # delete tmp first
                if os.path.exists(tmp):
                    os.remove(tmp)
                torch.save(model, tmp)

                if tot_loss < best_l:
                    if create_samples:
                        import numpy as np
                        import PIL
                        from PIL import Image
                        best_l = tot_loss
                        # save the model so we don't have to retrain it in memory

                        # save an output as a PIL image

                        out_X = None
                        for i in range(len(outputs)):
                            out_tensor = self.make_image_tensor(outputs, i)
                            # add to the right of out_X
                            if out_X is None:
                                out_X = out_tensor
                            else:
                                out_X = np.concatenate((out_X, out_tensor), axis=1)

                        out_y = None
                        for i in range(len(outputs)):
                            label_Tensor = self.make_image_tensor(batch_labels, i)
                            # add to the right of out_y
                            if out_y is None:
                                out_y = label_Tensor
                            else:
                                out_y = np.concatenate((out_y, label_Tensor), axis=1)
                        # add out_y to the bottom of out_X
                        out_tensor = np.concatenate((out_X, out_y), axis=0)

                        # get the mse of the output and the label
                        mse = np.mean((out_X - out_y) ** 2)

                        # stack them axis 0

                        out_tensor = PIL.Image.fromarray(out_tensor)
                        out_tensor.save(f"out{i}_{mse}_{str(loss.item())}.png")

                # load the best model
                if os.path.exists(tmp):
                    best_model = torch.load(tmp)

            # convert metrics to a list of floats
            metrics_out = [float(metric) for metric in metrics_out]
            model.to(torch.device("cpu"))
            del train_dataloader
            torch.cuda.empty_cache()
            del optimizer, loss_function
            return (model, metrics_out, best_model,)

    def make_image_tensor(self, outputs, i=0):
        import numpy as np
        out_tensor = outputs[i]
        # out tensor is flat
        # reshape it based on its square root
        side = int(out_tensor.shape[0] ** .5)
        out_tensor = out_tensor.reshape(side, side, -1)
        # out tensor is h,w,c float32 0 to 1
        out_tensor = out_tensor.cpu()
        # need 3 channels for PIL
        out_tensor = out_tensor.repeat(1, 1, 3)
        out_tensor = out_tensor.detach().numpy()
        out_tensor = np.clip(out_tensor, 0, 1)
        out_tensor = (out_tensor * 255).astype(np.uint8)
        return out_tensor


@ETK_pytorch_base
class TensorsToDataset:
    """
    allows users to convert a tensor to a dataset
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "input_data": ("TORCH_TENSOR",),  # The input data to perform inference on
                "labels": ("TORCH_TENSOR",),  # The input data to perform inference on
            },
            "optional": {
                "move to device": (["cuda", "cpu"], {"default": "cpu"}),

            }}

    RETURN_TYPES = ("TORCH_DATASET",)
    FUNCTION = "to_dataset"

    def to_dataset(self, input_data, labels, **kwargs):
        # perform inference on the input data or dataset using the model
        # and return the output
        if input_data.is_leaf == True:
            input_data.requires_grad = True

        try:
            if labels.is_leaf == True:
                labels.requires_grad = True
        except RuntimeError as e:
            if "floating point and complex dtype" in str(e):
                pass
            else:
                raise e

        move_to_device = kwargs.get("move to device", "cpu")
        if move_to_device == "cuda":
            device_to_use = torch.device("cuda")
        else:
            device_to_use = torch.device("cpu")

        input_data = input_data.to(device_to_use)
        labels = labels.to(device_to_use)

        output = torch.utils.data.TensorDataset(input_data, labels)
        return (output,)


@ETK_pytorch_base
class DatasetToDataloader:
    """
    allows users to convert a dataset to a dataloader
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "dataset": ("TORCH_DATASET",),  # The input data to perform inference on
            }
        }

    RETURN_TYPES = ("TORCH_DATALOADER",)
    FUNCTION = "to_dataloader"

    def to_dataloader(self, dataset):
        # perform inference on the input data or dataset using the model
        # and return the output
        output = torch.utils.data.DataLoader(dataset)
        return (output,)


@ETK_pytorch_base
class ComfyUIImageToPytorchTENSOR:
    """
    this just renames the object for compatibility with comfyui->pytorch
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "image": ("IMAGE",),
            }
        }

    RETURN_TYPES = ("TORCH_TENSOR", "TORCH_TENSOR",)
    RETURN_NAMES = ("b,h,w,c", "b,h,w,mean(c)",)
    FUNCTION = "to_tensor"

    def to_tensor(self, image):
        out1 = torch.tensor(image)
        out2 = torch.tensor(image).mean(dim=3)
        return (out1, out2,)


@ETK_pytorch_base
class ListToTensor:
    """
    this just renames the object for compatibility with comfyui->pytorch
    """

    @classmethod
    def INPUT_TYPES(cls):
        valid_dtypes_str = [str(dt) for k, dt in torch.__dict__.items() if isinstance(dt, torch.dtype)]

        return {
            "required": {
                "list": ("LIST",),
            },
            "optional": {
                "dtype": (valid_dtypes_str,),
            }
        }

    RETURN_TYPES = ("TORCH_TENSOR",)

    FUNCTION = "to_tensor"

    def to_tensor(self, list, dtype="float"):
        valid_dtypes_str = [str(dt) for k, dt in torch.__dict__.items() if isinstance(dt, torch.dtype)]
        valid_dtypes = [dt for k, dt in torch.__dict__.items() if isinstance(dt, torch.dtype)]
        output = torch.tensor(list)
        dts = dtype
        dto_i = valid_dtypes_str.index(dts)
        dto = valid_dtypes[dto_i]
        output = output.to(dto)
        return (output,)


@ETK_pytorch_base
class Activation:
    """
    uses values in torch.nn.modules.activation to create an activation function
    """

    @classmethod
    def INPUT_TYPES(cls):
        activation_str_names = [i for i in torch.nn.modules.activation.__dict__.keys() if i[0] != "_"]
        return {
            "required": {
                "model": ("TORCH_MODEL",),
                "activation": (activation_str_names,),
            }
        }

    RETURN_TYPES = ("TORCH_MODEL",)
    FUNCTION = "activation"

    def activation(self, model, activation):
        act = getattr(torch.nn.modules.activation, activation)()
        model = model.insert(len(model), act)
        return (model,)


@ETK_pytorch_base
class PyTorchToDevice:
    """
    moves a pytorch object to a device
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "device": (["cuda", "cpu"], {"default": "cpu"}),
            },
            "optional": {
                "model": ("TORCH_MODEL",),
                "tensor": ("TORCH_TENSOR",),

            }}

    RETURN_TYPES = ("TORCH_MODEL", "TORCH_TENSOR",)
    FUNCTION = "to_device"

    def to_device(self, device, model=None, tensor=None):
        if device == "cuda":
            device_to_use = torch.device("cuda")
        else:
            device_to_use = torch.device("cpu")

        model_out = None
        tensor_out = None

        if model is not None:
            model_out = model.to(device_to_use)
        if tensor is not None:
            tensor_out = tensor.to(device_to_use)

        return (model_out, tensor_out,)


import torch
import torch.nn as nn


@ETK_pytorch_base
class ExtractLayersAsModel:
    @classmethod
    def INPUT_TYPES(s):
        return {
            "required": {
                "model": ("TORCH_MODEL",),
                "start_idx": ("INT", {"min": 0}),
                "end_idx": ("INT", {"min": 0}),
                "freeze": (["True", "False"], {"default": "False"}),
            }
        }

    RETURN_TYPES = ("TORCH_MODEL", "STRING",)
    RETURN_NAMES = ("model", "shapes_str",)
    FUNCTION = "extract_layers"
    CATEGORY = "model"

    def extract_layers(self, model, start_idx, end_idx, freeze=False):
        if freeze == "True":
            freeze = True
        else:
            freeze = False

        # Ensure the model is a Sequential model
        if not isinstance(model, nn.Sequential):
            raise TypeError("The provided model is not a nn.Sequential model.")

        # Check the indices validity
        if start_idx < 0 or end_idx < start_idx or end_idx >= len(model):
            raise ValueError("Invalid start or end index.")

        # Extracting the desired layers
        extracted_layers = nn.Sequential(*list(model.children())[start_idx:end_idx + 1])

        # get a tuple of all the in out shapes
        shapes = []
        for i in range(start_idx, end_idx + 1):
            # check if it has in_features
            if hasattr(model[i], "in_features"):
                shapes.append(model[i].in_features)
            # check if it has out_features
            if hasattr(model[i], "out_features"):
                shapes.append(model[i].out_features)

        shapes_str = str(shapes)

        # to freeze or not to freeze
        if freeze:
            for param in extracted_layers.parameters():
                param.requires_grad = False

        # Returning the new Sequential model
        return (extracted_layers, shapes_str,)


@ETK_pytorch_base
class AddModelAsLayer:
    """
    given a model main and model addition adds the model addition to the end of the model main

    """

    @classmethod
    def INPUT_TYPES(s):
        return {
            "required": {
                "model_main": ("TORCH_MODEL",),
                "model_addition": ("TORCH_MODEL",),
            }
        }

    RETURN_TYPES = ("TORCH_MODEL",)
    FUNCTION = "add_model"
    CATEGORY = "model"

    def add_model(self, model_main, model_addition):
        # Ensure both models are Sequential models
        if not isinstance(model_main, nn.Sequential):
            raise TypeError("model_main is not a nn.Sequential model.")
        if not isinstance(model_addition, nn.Sequential):
            raise TypeError("model_addition is not a nn.Sequential model.")

        # Adding each layer of model_addition to model_main
        for layer in model_addition.children():
            model_main.add_module(f"added_layer_{len(model_main)}", layer)

        # Returning the updated model_main
        return (model_main,)


@ETK_pytorch_base
class RandomTensor:
    """
    creates a random tensor of a given shape and dtype and initialization method
    """

    @classmethod
    def INPUT_TYPES(s):
        valid_dtypes_str = [str(dt) for k, dt in torch.__dict__.items() if isinstance(dt, torch.dtype)]
        return {
            "required": {
                "shape": ("STRING", {"default": "(1,1)"}),
            },
            "optional": {
                "dtype": (valid_dtypes_str,),
                "init_method": (
                    ["rand", "randn", "randint", "randint_like", "rand_like", "randn_like"], {"default": "rand"}),
            }
        }

    RETURN_TYPES = ("TORCH_TENSOR",)
    FUNCTION = "random_tensor"
    CATEGORY = "tensor"

    def random_tensor(self, shape, dtype="float", init_method="rand"):
        valid_dtypes_str = [str(dt) for k, dt in torch.__dict__.items() if isinstance(dt, torch.dtype)]
        valid_dtypes = [dt for k, dt in torch.__dict__.items() if isinstance(dt, torch.dtype)]
        dts = dtype
        dto_i = valid_dtypes_str.index(dts)
        dto = valid_dtypes[dto_i]

        # do not eval shape, first remove enclosing parens
        shape = shape[1:-1]
        # now split on comma
        shape = shape.split(",")
        # now convert to int
        shape = [int(s) for s in shape]
        # now convert to tuple
        shape = tuple(shape)

        if init_method == "rand":
            output = torch.rand(shape, dtype=dto)
        elif init_method == "randn":
            output = torch.randn(shape, dtype=dto)
        elif init_method == "randint":
            output = torch.randint(shape, dtype=dto)
        elif init_method == "randint_like":
            output = torch.randint_like(shape, dtype=dto)
        elif init_method == "rand_like":
            output = torch.rand_like(shape, dtype=dto)
        elif init_method == "randn_like":
            output = torch.randn_like(shape, dtype=dto)
        return (output,)


@ETK_pytorch_base
class GridSearchTraining:
    """
    Performs grid search training using the TrainModel class.
    """

    @classmethod
    def INPUT_TYPES(cls):
        default_param_grid = json.dumps({
            'epochs': [1, 2],
            'batch_size': [32, 64],
            'loss_function': ['MSELoss', 'CrossEntropyLoss']
        })

        return {
            "required": {
                "model": ("TORCH_MODEL",),
                "param_grid": ("STRING", {"default": default_param_grid}),  # String representation of param_grid
            },
            "optional": {
                "dataset": ("TORCH_DATASET",),
                "features tensor": ("TORCH_TENSOR",),
                "labels tensor": ("TORCH_TENSOR",),
                # Other optional parameters can be added here
            }
        }

    RETURN_TYPES = ("TORCH_MODEL", "DICT", "LIST")
    RETURN_NAMES = ("best_model", "best_params", "all_metrics")
    FUNCTION = "grid_search_train"

    def grid_search_train(self, model, param_grid, **kwargs):
        """
        Trains the model using grid search.
        """
        from itertools import product

        # Parse the param_grid from string to dictionary
        param_grid_dict = json.loads(param_grid)

        best_model = None
        best_params = None
        all_metrics = []

        # Generate all combinations of parameters
        param_combinations = list(product(*param_grid_dict.values()))

        for params in param_combinations:
            # Map the parameters to the appropriate keys
            train_kwargs = dict(zip(param_grid_dict.keys(), params))
            # Merge with other kwargs (like dataset or tensors)
            train_kwargs.update(kwargs)

            print(f"Training with parameters: {train_kwargs}")

            # Create a new instance of TrainModel and train the model
            trainer = TrainModel()
            trained_model, metrics, _ = trainer.train(model, **train_kwargs)

            # Store metrics for each combination
            all_metrics.append(metrics)

            # Determine the best model and parameters (implement your own logic)
            if best_model is None or self.is_better(metrics, all_metrics):
                best_model = trained_model
                best_params = train_kwargs

        return best_model, best_params, all_metrics

    @staticmethod
    def is_better(current_metrics, all_metrics):
        """
        Determines if the current model is better than the previous models.
        Implement your own logic here based on the metrics.
        """
        # Example comparison logic, adjust as needed
        return current_metrics[-1] < min(all_metrics, key=lambda m: m[-1])[-1]


@ETK_pytorch_base
class SaveTorchTensor:
    """
    Saves a torch tensor to a file using torch.save which has the required parameters of obj and f
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "tensor": ("TORCH_TENSOR", {"default": None}),
                "file": ("STRING", {"default": "/somewhere/some.pt"}),
            },

        }

    RETURN_TYPES = ("STRING",)
    FUNCTION = "save_torch_tensor"
    OUTPUT_NODE = True

    def save_torch_tensor(self, tensor, file):
        import torch
        """
        Saves a torch tensor to a file
        """
        torch.save(tensor, file)
        return (file,)


@ETK_pytorch_base
class LoadTorchTensor:
    """
    Loads a torch tensor from a file using torch.load
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "file": ("STRING", {"default": "/somewhere/some.pt"}),
            },

        }

    RETURN_TYPES = ("TORCH_TENSOR",)
    FUNCTION = "load_torch_tensor"

    def load_torch_tensor(self, file):
        import torch
        """
        Loads a torch tensor from a file
        """
        return (torch.load(file),)


if __name__ == "__main__":
    import json

    # Example usage
    param_grid_str = json.dumps({
        'epochs': [1, 2],
        'batch_size': [32, 64],
        'loss_function': ['MSELoss', 'CrossEntropyLoss']
        # Add other hyperparameters and their ranges here
    })

    # Creating a synthetic dataset
    num_samples = 100
    num_features = 10
    num_classes = 2
    synthetic_features = torch.randn(num_samples, num_features)
    synthetic_labels = torch.randint(0, num_classes, (num_samples,))
    # needs one hot encoding
    synthetic_labels = torch.nn.functional.one_hot(synthetic_labels, num_classes=num_classes)
    # needs to be float
    synthetic_labels = synthetic_labels.float()

    # Define the model
    model = nn.Sequential(
        nn.Linear(num_features, 5),
        nn.ReLU(),
        nn.Linear(5, num_classes),
        nn.Softmax(dim=1)
    )

    # Instantiate the GridSearchTraining class
    grid_search = GridSearchTraining()

    # Run grid search training
    best_model, best_params, all_metrics = grid_search.grid_search_train(
        model,
        param_grid_str,
        dataset=torch.utils.data.TensorDataset(synthetic_features, synthetic_labels)
    )

    print("Best parameters:", best_params)