viiccwen opened a new issue, #804:
URL: https://github.com/apache/mahout/issues/804
### Description
The preprocessing pipeline in `qdp-core` did not validate input data for NaN
(Not a Number) and Infinity values, allowing invalid numerical values to
propagate through the quantum encoding pipeline.
### Steps to Reproduce
Writing a script to reproduce it:
```rust
use qdp_core::preprocessing::Preprocessor;
// This would pass validation and return NaN
let data_with_nan = vec![1.0, f64::NAN, 3.0];
let result = Preprocessor::calculate_l2_norm(&data_with_nan);
// Result: Ok(NaN)
```
### Expected Behavior
All preprocessing functions should return `Err(MahoutError::InvalidInput)`
with clear error messages when NaN or Infinity values are detected.
### Actual Behavior
When input data contains NaN or Infinity values:
- `validate_input()` and `validate_batch()` would pass validation
- `calculate_l2_norm()` and `calculate_batch_l2_norms()` would return
NaN/Infinity
- These invalid values would propagate to quantum simulation, causing:
- Invalid quantum state vectors
- GPU computation errors
- Silent failures or crashes
### Environment
- In every environment
### Additional Context
I'm willing to help to solve the issue! 🙌
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