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improved readability of Additional Experiments table

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ch06/02_bonus_additional-experiments/README.md
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# Additional Experiments
The table below adds experiments to answer additional questions about various design choices. The first row uses the same settings as the main chapter and is used as a reference.
For example,
For example,
- comparing rows 1 and 2 answers the question: "What is the performance difference when we train the last or first token?";
- comparing rows 1 and 3 answers the question: "What is the performance difference when we train only the last layer instead of the last block?";
@ -9,23 +9,22 @@ For example,
 
| | Model | Weights | Trainable token | Trainable layers | Context length | Training acc | Validation acc | Test acc | Training time | CPU/GPU |
| ---- | ------------------ | ---------- | --------------- | ---------------- | ----------------------- | ------------ | -------------- | -------- | ------------- | ------- |
| 1 | gpt2-small (124M) | pretrained | last | last_block | longest train ex. (120) | 96.63% | 99.33% | 95.00% | 0.28 min | A100 |
| 2 | gpt2-small (124M) | pretrained | first | last_block | longest train ex. (120) | 78.46% | 80.54% | 75.00% | 0.28 min | A100 |
| 3 | gpt2-small (124M) | pretrained | last | last_layer | longest train ex. (120) | 78.65% | 79.87% | 72.00% | 0.25 min | A100 |
| 4 | gpt2-small (124M) | pretrained | last | all | longest train ex. (120) | 99.62% | 96.64% | 96.67% | 0.69 min | A100 |
| 5 | gpt2-medium (355M) | pretrained | last | last_block | longest train ex. (120) | 87.50% | 91.28% | 84.67% | 0.75 min | A100 |
| 6 | gpt2-large (774M) | pretrained | last | last_block | longest train ex. (120) | 99.52% | 98.66% | 96.67% | 1.50 min | A100 |
| 7 | gpt2-xl (1558M) | pretrained | last | last_block | longest train ex. (120) | 99.81% | 99.33% | 98.33% | 2.83 min | A100 |
| 8 | gpt2-small (124M) | random | last | all | longest train ex. (120) | 100% | 96.64% | 93.67% | 0.69 min | A100 |
| 9 | gpt2-small (124M) | pretrained | last | LoRA | longest train ex. (120) | 100.00% | 97.32% | 96.67% | 0.75 min | A100 |
| 10 | gpt2-small (124M) | pretrained | last | last_block | context length (1024) | 83.08% | 87.92% | 78.33% | 2.46 min | A100 |
| 11 | gpt2-small (124M) | pretrained | last | last_block | variable: no padding (batch size 1) | 100.00% | 98.66% | 98.00% | 1.75 min | A100 |
| 12 | gpt2-small (124M) | pretrained | last | last_block | variable: no padding (batch size 8) | 99.33% | 98.66% | 98.33% | 1.70 min | A100 |
| 13 | gpt2-small (124M) | pretrained | last | last_block | longest train ex. (120); but no causal mask | 99.23% | 98.66% | 95.33% | 0.29 min | A100 |
| 14 | gpt2-small (124M) | pretrained | last | last_block | longest train ex. (120) and `ignore_index` for padding | 96.63% | 99.33% | 95.00% | 0.28 min | A100 |
| | Model | Weights | Trainable token | Trainable layers | Context length | Training acc | Validation acc | Test acc | Training time | CPU/GPU |
| --- | ------------------ | ---------- | --------------- | ---------------- | ------------------------------------------------------ | ------------ | -------------- | -------- | ------------- | ------- |
| 1 | gpt2-small (124M) | pretrained | last | last_block | longest train ex. (120) | 96.63% | 99.33% | 95.00% | 0.28 min | A100 |
| 2 | gpt2-small (124M) | pretrained | first | last_block | longest train ex. (120) | 78.46% | 80.54% | 75.00% | 0.28 min | A100 |
| 3 | gpt2-small (124M) | pretrained | last | last_layer | longest train ex. (120) | 78.65% | 79.87% | 72.00% | 0.25 min | A100 |
| 4 | gpt2-small (124M) | pretrained | last | all | longest train ex. (120) | 99.62% | 96.64% | 96.67% | 0.69 min | A100 |
| 5 | gpt2-medium (355M) | pretrained | last | last_block | longest train ex. (120) | 87.50% | 91.28% | 84.67% | 0.75 min | A100 |
| 6 | gpt2-large (774M) | pretrained | last | last_block | longest train ex. (120) | 99.52% | 98.66% | 96.67% | 1.50 min | A100 |
| 7 | gpt2-xl (1558M) | pretrained | last | last_block | longest train ex. (120) | 99.81% | 99.33% | 98.33% | 2.83 min | A100 |
| 8 | gpt2-small (124M) | random | last | all | longest train ex. (120) | 100% | 96.64% | 93.67% | 0.69 min | A100 |
| 9 | gpt2-small (124M) | pretrained | last | LoRA | longest train ex. (120) | 100.00% | 97.32% | 96.67% | 0.75 min | A100 |
| 10 | gpt2-small (124M) | pretrained | last | last_block | context length (1024) | 83.08% | 87.92% | 78.33% | 2.46 min | A100 |
| 11 | gpt2-small (124M) | pretrained | last | last_block | variable: no padding (batch size 1) | 100.00% | 98.66% | 98.00% | 1.75 min | A100 |
| 12 | gpt2-small (124M) | pretrained | last | last_block | variable: no padding (batch size 8) | 99.33% | 98.66% | 98.33% | 1.70 min | A100 |
| 13 | gpt2-small (124M) | pretrained | last | last_block | longest train ex. (120); but no causal mask | 99.23% | 98.66% | 95.33% | 0.29 min | A100 |
| 14 | gpt2-small (124M) | pretrained | last | last_block | longest train ex. (120) and `ignore_index` for padding | 96.63% | 99.33% | 95.00% | 0.28 min | A100 |
 
@ -34,7 +33,7 @@ For example,
You can use the following code to reproduce the experiments:
- Row 1: `python additional-experiments.py`
- Row 2: `python additional-experiments.py --trainable_token first`
- Row 2: `python additional-experiments.py --trainable_token first`
- Row 3: `python additional-experiments.py --trainable_layers last_layer`
- Row 4: `python additional-experiments.py --trainable_layers all`
- Row 5: `python additional-experiments.py --model_size "gpt2-medium (355M)"`