[slimtensor] Add item() methods with CUDA and CPU support for scalar value extraction#16445
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…value extraction Add two `item()` methods to SlimTensor for extracting scalar values from single-element tensors: 1. **`item<T>()`** - Templated version requiring explicit type specification 2. **`item()`** - Non-templated version that auto-detects dtype and returns double Both methods: - Support all 7 slim dtypes (Float, BFloat16, Long, Int, Short, Char, Bool) - Handle CUDA tensors by automatically copying data to CPU - Validate that tensor has exactly 1 element Differential Revision: [D90034340](https://our.internmc.facebook.com/intern/diff/D90034340/) [ghstack-poisoned]
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…for scalar value extraction" Add two `item()` methods to SlimTensor for extracting scalar values from single-element tensors: 1. **`item<T>()`** - Templated version requiring explicit type specification 2. **`item()`** - Non-templated version that auto-detects dtype and returns double Both methods: - Support all 7 slim dtypes (Float, BFloat16, Long, Int, Short, Char, Bool) - Handle CUDA tensors by automatically copying data to CPU - Validate that tensor has exactly 1 element Differential Revision: [D90034340](https://our.internmc.facebook.com/intern/diff/D90034340/) [ghstack-poisoned]
…for scalar value extraction" Add two `item()` methods to SlimTensor for extracting scalar values from single-element tensors: 1. **`item<T>()`** - Templated version requiring explicit type specification 2. **`item()`** - Non-templated version that auto-detects dtype and returns double Both methods: - Support all 7 slim dtypes (Float, BFloat16, Long, Int, Short, Char, Bool) - Handle CUDA tensors by automatically copying data to CPU - Validate that tensor has exactly 1 element Differential Revision: [D90034340](https://our.internmc.facebook.com/intern/diff/D90034340/) [ghstack-poisoned]
…for scalar value extraction" Add two `item()` methods to SlimTensor for extracting scalar values from single-element tensors: 1. **`item<T>()`** - Templated version requiring explicit type specification 2. **`item()`** - Non-templated version that auto-detects dtype and returns double Both methods: - Support all 7 slim dtypes (Float, BFloat16, Long, Int, Short, Char, Bool) - Handle CUDA tensors by automatically copying data to CPU - Validate that tensor has exactly 1 element Differential Revision: [D90034340](https://our.internmc.facebook.com/intern/diff/D90034340/) [ghstack-poisoned]
larryliu0820
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Jan 20, 2026
…for scalar value extraction" Add two `item()` methods to SlimTensor for extracting scalar values from single-element tensors: 1. **`item<T>()`** - Templated version requiring explicit type specification 2. **`item()`** - Non-templated version that auto-detects dtype and returns double Both methods: - Support all 7 slim dtypes (Float, BFloat16, Long, Int, Short, Char, Bool) - Handle CUDA tensors by automatically copying data to CPU - Validate that tensor has exactly 1 element Differential Revision: [D90034340](https://our.internmc.facebook.com/intern/diff/D90034340/) [ghstack-poisoned]
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…value extraction Pull Request resolved: #16445 Add two `item()` methods to SlimTensor for extracting scalar values from single-element tensors: 1. **`item<T>()`** - Templated version requiring explicit type specification 2. **`item()`** - Non-templated version that auto-detects dtype and returns double Both methods: - Support all 7 slim dtypes (Float, BFloat16, Long, Int, Short, Char, Bool) - Handle CUDA tensors by automatically copying data to CPU - Validate that tensor has exactly 1 element ghstack-source-id: 334622016 @exported-using-ghexport Differential Revision: [D90034340](https://our.internmc.facebook.com/intern/diff/D90034340/)
…for scalar value extraction" Add two `item()` methods to SlimTensor for extracting scalar values from single-element tensors: 1. **`item<T>()`** - Templated version requiring explicit type specification 2. **`item()`** - Non-templated version that auto-detects dtype and returns double Both methods: - Support all 7 slim dtypes (Float, BFloat16, Long, Int, Short, Char, Bool) - Handle CUDA tensors by automatically copying data to CPU - Validate that tensor has exactly 1 element Differential Revision: [D90034340](https://our.internmc.facebook.com/intern/diff/D90034340/) [ghstack-poisoned]
…for scalar value extraction" Add two `item()` methods to SlimTensor for extracting scalar values from single-element tensors: 1. **`item<T>()`** - Templated version requiring explicit type specification 2. **`item()`** - Non-templated version that auto-detects dtype and returns double Both methods: - Support all 7 slim dtypes (Float, BFloat16, Long, Int, Short, Char, Bool) - Handle CUDA tensors by automatically copying data to CPU - Validate that tensor has exactly 1 element Differential Revision: [D90034340](https://our.internmc.facebook.com/intern/diff/D90034340/) [ghstack-poisoned]
This was referenced Jan 22, 2026
…for scalar value extraction" Add two `item()` methods to SlimTensor for extracting scalar values from single-element tensors: 1. **`item<T>()`** - Templated version requiring explicit type specification 2. **`item()`** - Non-templated version that auto-detects dtype and returns double Both methods: - Support all 7 slim dtypes (Float, BFloat16, Long, Int, Short, Char, Bool) - Handle CUDA tensors by automatically copying data to CPU - Validate that tensor has exactly 1 element Differential Revision: [D90034340](https://our.internmc.facebook.com/intern/diff/D90034340/) [ghstack-poisoned]
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…value extraction (#16840) This PR was created by the merge bot to help merge the original PR into the main branch. ghstack PR number: #16445 by @Gasoonjia ^ Please use this as the source of truth for the PR details, comments, and reviews ghstack PR base: https://github.com/pytorch/executorch/tree/gh/gasoonjia/87/base ghstack PR head: https://github.com/pytorch/executorch/tree/gh/gasoonjia/87/head Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/gasoonjia/86/orig Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/gasoonjia/87/orig Differential Revision: [D90034340](https://our.internmc.facebook.com/intern/diff/D90034340/) @diff-train-skip-merge --------- Co-authored-by: gasoonjia <gasoonjia@icloud.com>
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Stack from ghstack (oldest at bottom):
Add two
item()methods to SlimTensor for extracting scalar values from single-element tensors:item<T>()- Templated version requiring explicit type specificationitem()- Non-templated version that auto-detects dtype and returns doubleBoth methods:
Differential Revision: D90034340