[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]
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16445
Note: Links to docs will display an error until the docs builds have been completed. ❌ 116 New Failures, 3 Unrelated FailuresAs of commit 741fab2 with merge base 3512861 ( NEW FAILURES - The following jobs have failed:
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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
approved these changes
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]
Gasoonjia
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Jan 20, 2026
…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
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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