[slimtensor] Add SlimTensor class with basic properties and CPU copy operation #16385
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…operation
**Key components:**
1. **`c10/core/Contiguity.h`** - Contiguity checking utility:
- `_compute_contiguous<T>()` - computes whether a tensor with given sizes/strides is contiguous in memory (row-major order)
2. **`core/SlimTensor.h`** - Main SlimTensor class with:
- **Constructors**: Default (undefined tensor) and full constructor with storage, sizes, strides, dtype, and storage_offset
- **Property accessors**:
- `sizes()`, `size(dim)` - get tensor dimensions with negative indexing support
- `strides()`, `stride(dim)` - get tensor strides with negative indexing support
- `dtype()`, `device()`, `device_type()`, `device_index()`
- `numel()`, `dim()`, `nbytes()`, `itemsize()`
- `data_ptr()` - returns pointer to tensor data (adjusted for storage_offset)
- `storage_offset()`, `storage()`
- **State queries**: `defined()`, `is_cpu()`, `is_contiguous()`, `is_empty()`
- **Copy operation**: `copy_(other)` - copies data from another tensor
- Fast path: uses memcpy for both-contiguous tensors
- Slow path: element-wise copy respecting strides for non-contiguous tensors
- **Setters**: `reset()`, `set_storage()`, `set_sizes_and_strides()`
**Curretnt constraints:**
- Only CPU device supported
- Only Float32 dtype tested
- copy_() only supports CPU-to-CPU copy
Those contraints will be further improved in the following diffs
Differential Revision: [D89750150](https://our.internmc.facebook.com/intern/diff/D89750150/)
[ghstack-poisoned]
This was referenced Dec 24, 2025
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16385
Note: Links to docs will display an error until the docs builds have been completed. ❌ 2 New Failures, 1 Unrelated FailureAs of commit 4af5078 with merge base 210047b ( NEW FAILURES - The following jobs have failed:
UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:
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Gasoonjia
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…operation
**Key components:**
1. **`c10/core/Contiguity.h`** - Contiguity checking utility:
- `_compute_contiguous<T>()` - computes whether a tensor with given sizes/strides is contiguous in memory (row-major order)
2. **`core/SlimTensor.h`** - Main SlimTensor class with:
- **Constructors**: Default (undefined tensor) and full constructor with storage, sizes, strides, dtype, and storage_offset
- **Property accessors**:
- `sizes()`, `size(dim)` - get tensor dimensions with negative indexing support
- `strides()`, `stride(dim)` - get tensor strides with negative indexing support
- `dtype()`, `device()`, `device_type()`, `device_index()`
- `numel()`, `dim()`, `nbytes()`, `itemsize()`
- `data_ptr()` - returns pointer to tensor data (adjusted for storage_offset)
- `storage_offset()`, `storage()`
- **State queries**: `defined()`, `is_cpu()`, `is_contiguous()`, `is_empty()`
- **Copy operation**: `copy_(other)` - copies data from another tensor
- Fast path: uses memcpy for both-contiguous tensors
- Slow path: element-wise copy respecting strides for non-contiguous tensors
- **Setters**: `reset()`, `set_storage()`, `set_sizes_and_strides()`
**Curretnt constraints:**
- Only CPU device supported
- Only Float32 dtype tested
- copy_() only supports CPU-to-CPU copy
Those contraints will be further improved in the following diffs
Differential Revision: [D89750150](https://our.internmc.facebook.com/intern/diff/D89750150/)
ghstack-source-id: 331051343
Pull Request resolved: #16385
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Stack from ghstack (oldest at bottom):
Key components:
c10/core/Contiguity.h- Contiguity checking utility:_compute_contiguous<T>()- computes whether a tensor with given sizes/strides is contiguous in memory (row-major order)core/SlimTensor.h- Main SlimTensor class with:sizes(),size(dim)- get tensor dimensions with negative indexing supportstrides(),stride(dim)- get tensor strides with negative indexing supportdtype(),device(),device_type(),device_index()numel(),dim(),nbytes(),itemsize()data_ptr()- returns pointer to tensor data (adjusted for storage_offset)storage_offset(),storage()defined(),is_cpu(),is_contiguous(),is_empty()copy_(other)- copies data from another tensorreset(),set_storage(),set_sizes_and_strides()Curretnt constraints:
Those contraints will be further improved in the following diffs
Differential Revision: D89750150