Chainer vs TensorFlow: What are the differences?

# Introduction
Chainer and TensorFlow are both popular deep learning frameworks that are widely used in the field of artificial intelligence and machine learning. 

1. **Computational Graph Construction**: One key difference between Chainer and TensorFlow is how they handle computational graph construction. Chainer uses a define-by-run approach, where the computational graph is dynamically constructed as the operations are executed. In contrast, TensorFlow uses a define-and-run approach, where the computational graph is defined before execution, offering better optimization opportunities.

2. **Static vs Dynamic Graphs**: TensorFlow relies on static computational graph construction, meaning the graph structure is fixed before the actual computation. This approach allows for better optimizations but can be restrictive in certain cases. Chainer, on the other hand, uses dynamic computational graphs that can adapt and change during runtime, providing more flexibility and ease in debugging models.

3. **Eager Execution**: Chainer supports eager execution by default, allowing users to execute operations immediately without needing to define a computational graph. This makes it easy for users to interactively experiment with their code and prototypes. TensorFlow, although it has introduced eager execution mode, traditionally requires explicit graph construction before execution.

4. **Ease of Use**: Chainer is known for its ease of use and simplicity, making it a preferred choice for beginners or researchers who are new to deep learning. TensorFlow, on the other hand, has a steeper learning curve due to its complexity and extensive features, which cater more towards production-level applications and larger-scale projects.

5. **Community Support and Ecosystem**: TensorFlow boasts a larger and more established community with a wide range of resources, tutorials, and pre-trained models available. This robust ecosystem contributes to the popularity and widespread adoption of TensorFlow. Chainer, while having a smaller user base, still provides strong documentation and support for its users.

In Summary, Chainer and TensorFlow differ in their computational graph construction approaches, graph flexibility, eager execution support, ease of use, and community support, catering to different user preferences in the deep learning domain.```