I want to implement Colossal Ai distributed training in my training script, what are the steps needed to convert my pytorch training script into using the Colossal Ai distributed training library?
Colossal AI is a high-performance distributed deep learning library, built on top of PyTorch. To convert your PyTorch training script to use Colossal AI for distributed training, follow these steps:

Install Colossal AI:
1. First, install the library by running the following command:

```
pip install colossalai
```

2. Import required libraries:
In your training script, import the necessary Colossal AI libraries, such as:
```python
import torch
import colossalai
from colossalai.core import global_context as gpc
from colossalai.initializer import init_config, init_dist
from colossalai.utils import get_world_size
```

3. Initialize the configuration:
Load the configuration file and initialize the distributed environment using the init_config and init_dist functions. Make sure you have a valid configuration file (usually in YAML format)
```python
config = 'path/to/your/config.yaml'
init_config(config)
init_dist()
```

4. Modify your DataLoader:
Replace your original PyTorch DataLoader with Colossal AI's DataLoader, which supports parallel data loading.
```python
from colossalai import DataLoader
# ...
train_loader = DataLoader(dataset=train_dataset, batch_size=batch_size, shuffle=True)
```

5. Convert your model to a parallel model:
Modify your model by wrapping it with Colossal AI's parallel engine. For example, if you're using a 2D parallelism with pipeline and tensor slicing, you can use the PipelineModule and ParallelLinear layers:
```python
from colossalai.nn import PipelineModule, ParallelLinear
# ...
class MyModel(PipelineModule):
    def __init__(self):
        super().__init__()
        self.linear1 = ParallelLinear(in_features, hidden_features)
        # ...
    # ...
model = MyModel()
```

6. Replace the optimizer:
Use Colossal AI's distributed optimizer to replace the original PyTorch optimizer.
```python
from colossalai.optim import Adam
# ...
optimizer = Adam(model.parameters(), lr=learning_rate)
```

7. Update the training loop:
In the training loop, use Colossal AI's backward and step functions for gradient calculation and optimization.
```python
from colossalai.engine import backward, step
# ...
for epoch in range(num_epochs):
    for batch in train_loader:
        # ...
        loss = criterion(output, target)
        backward(loss)
        step(optimizer)
        # ...
```

8. Finalize the distributed environment:
After the training is complete, finalize the distributed environment.
``` python
gpc.destroy()
```

This is a basic outline to convert your PyTorch training script into using the Colossal AI distributed training library. The actual implementation may vary depending on the specifics of your training script and the parallelism strategies you choose. Be sure to refer to Colossal AI's documentation and examples for more detailed guidance.
Well done. Can you give a complete beginner script for me?