Updated tests and no autograd docs

[sourcepirate]

No description provided.

[Copilot]

Pull request overview

This PR expands neutro’s test coverage across preprocessing, tokenizers, model internals, engine graph nodes, and several layer families, while also emphasizing the project’s no-autograd educational design in docs. It includes one source change to make Dropout report unchanged output shapes.

Changes:

• Added broad unit coverage for utilities, tokenizers, preprocessing, model helpers, engine nodes, and many layers.
• Added Dropout.compute_output_shape.
• Documented the “No Autograd” principle in README, base layer docs, and agent guidelines.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/utils/test_data_utils.py	Adds mocked tests for IMDB dataset utilities.
tests/tokenizers/test_tiktoken_compat.py	Adds URL-loading and GPT-2 tokenizer tests.
tests/test_preprocessing.py	Adds image augmentation edge-case tests.
tests/test_preprocessing_text.py	Adds tokenizer text preprocessing tests.
tests/test_preprocessing_sequence.py	Adds pad_sequences behavior and error tests.
tests/models/test_model_coverage.py	Adds model graph, fit/evaluate, summary, gradient, and KV-cache coverage.
tests/models/test_model_coverage2.py	Adds additional model helper and subclassed model coverage.
tests/layers/pooling/test_global_pooling.py	Adds pooling validation and output-shape tests.
tests/layers/normalization/test_batchnorm.py	Adds batch normalization inference-state coverage.
tests/layers/embedding/test_time_embedding.py	Adds build, shape, 2D, and odd-dimension tests.
tests/layers/core/test_reparameterization.py	Adds output-shape and backward-value tests.
tests/layers/core/test_merging_coverage.py	Adds merge-layer forward/backward/output-shape tests.
tests/layers/core/test_input_layer.py	Adds input layer and symbolic Input tests.
tests/layers/core/test_dropout.py	Refactors and expands Dropout tests.
tests/engine/test_node.py	Adds KerasTensor and Node tests.
neutro/layers/core/dropout.py	Adds compute_output_shape.
README.md	Adds no-autograd overview.
docs/layers/base.md	Adds no-autograd explanation to layer docs.
Agents.md	Adds no-autograd as a core project principle.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[sourcepirate]

@copilot fix review commentws.

[Copilot]

@copilot fix review commentws.

Addressed in d71d3d6. I updated the Dropout docs to include compute_output_shape, strengthened the inference-after-training dropout test, and fixed Dropout.forward to clear stale masks on inference so the new coverage passes.