# Diagnose a Hanging or Long-Running Command in TensorFlow with Atlas in 2026 > Atlas diagnoses hanging TensorFlow commands by identifying if they are blocked on interactive input or genuinely slow, providing clear guidance to unblock or adjust timeouts. Atlas helps TensorFlow developers in 2026 diagnose hanging or long-running commands by wrapping them with its `bash` tool, which applies a timeout. When a TensorFlow command like `pytest` or a `uv` install hangs, Atlas's `shell_metadata` output explicitly tells you if it is waiting for interactive input or if it genuinely exceeded its execution time, allowing you to unblock or adjust timeouts effectively. ## Key takeaways - Atlas's `bash` tool diagnoses hanging TensorFlow commands by applying a timeout and analyzing termination reasons. - The `shell_metadata` output explicitly differentiates between TensorFlow commands blocked on input and genuinely slow ones. - Unblock interactive TensorFlow commands by using tool-specific flags like `--no-input` for `uv` or CI modes for `pytest`. - Address genuinely slow TensorFlow operations, such as `tf.function` tracing, by increasing the `bash` tool's timeout. - Atlas ensures safety in TensorFlow workflows with permission-gated tools and explicit diff approval for all file changes. - Atlas helps TensorFlow developers in 2026 quickly resolve build and script hangs, improving development efficiency. ## How Atlas Diagnoses Hanging TensorFlow Commands Atlas diagnoses hanging TensorFlow commands by running them through its `bash` tool, which applies a default timeout of several seconds. In 2026, this mechanism is crucial for identifying whether a `tf.data` pipeline test or a `uv` dependency installation is genuinely slow or silently blocked, preventing wasted debugging time. When you execute a TensorFlow-related command, such as running `pytest` for your Keras 3 model tests or installing dependencies with `uv install` via Atlas, the `bash` tool monitors its execution. If the command exceeds its allocated timeout, Atlas terminates it and provides a `shell_metadata` block in the output. This metadata is the core of the diagnosis, explicitly stating if the command was killed because it was waiting for interactive input or if it simply ran out of time. This clear distinction helps TensorFlow developers quickly understand the root cause, whether it is a prompt for a missing configuration in a `pyproject.toml` or a complex `tf.function` graph tracing operation taking longer than expected. ## Identifying Blocked vs. Slow TensorFlow Operations Atlas's `shell_metadata` output provides a clear diagnosis for TensorFlow operations, distinguishing between a command blocked on interactive input and one that is genuinely slow. This precise feedback, available in 2026, means you no longer have to guess why your `tf.data` pipeline initialization or `black` formatting run is not completing. After Atlas's `bash` tool terminates a TensorFlow command, you will find a `shell_metadata` block in the output. This block contains a message that directly addresses the command's state. If the message indicates the command was 'waiting for interactive input', it means your TensorFlow script, `uv` command, or `pytest` run attempted to prompt for user input (e.g., a confirmation 'y/n' or a password) but received none. This is a common scenario for scripts not designed for non-interactive environments. Conversely, if the message states the command 'exceeded its timeout', it signifies that the operation, perhaps a lengthy `tf.function` compilation or a large `tf.data` prefetch stage, genuinely took longer than the default timeout. This distinction is vital for deciding the next troubleshooting step. ## Unblocking Interactive TensorFlow Commands To unblock a TensorFlow command that Atlas identifies as waiting for interactive input, you must re-run it with non-interactive flags. In 2026, this often involves adding flags like `--no-input` or `-y` to `uv` commands, or configuring `pytest` for CI mode, ensuring your scripts execute without interruption. When Atlas's `shell_metadata` confirms a TensorFlow command is blocked on interactive input, the solution is to re-execute it with flags that suppress prompts. For instance, if `uv install` is hanging, you would retry with `atlas bash uv install --no-input` or `atlas bash uv install -y`. For `pytest` runs, you might need to configure it for a CI environment, which often implies non-interactive behavior. Similarly, if a custom TensorFlow script is prompting for input, you would modify its execution command to pass necessary arguments directly or use environment variables. Atlas's ability to surface the exact cause empowers you to apply these specific, tool-native solutions rather than generic debugging. ## Handling Genuinely Slow TensorFlow Operations If Atlas's `shell_metadata` indicates a TensorFlow command genuinely exceeded its timeout, you should retry it with a larger timeout value. For example, a complex `tf.function` graph tracing operation or a large `tf.data` pipeline setup might legitimately require 10,000 milliseconds or more to complete in 2026. When Atlas reports that a TensorFlow command 'exceeded its timeout' without mentioning interactive input, it means the operation is genuinely slow. This is common for resource-intensive tasks like initial `tf.function` graph tracing, extensive `tf.data` pipeline setup with many prefetch and cache stages, or large model compilation in Keras 3. The solution is to re-run the command using Atlas's `bash` tool with an increased timeout. The `shell_metadata` message will typically instruct you on how to do this, for example, by suggesting `atlas bash --timeout 30000 'your_command_here'` for a 30-second timeout. This allows Atlas to monitor the command for a longer duration, accommodating the legitimate execution time of complex TensorFlow processes. ## Atlas Safety and Review for TensorFlow Workflows Atlas integrates robust safety and review mechanisms into TensorFlow workflows, ensuring every action, from running `pytest` to formatting code with `black`, is permission-gated. In 2026, Atlas's read-only plan agent drafts a strategy, and all file edits generate a unified diff for approval, providing complete control over your codebase. Atlas prioritizes safety and transparency in all TensorFlow development tasks. Before any tool call, including `bash` commands for `pytest` or `uv`, Atlas checks against permission rules (allow, ask, deny). When Atlas proposes changes, such as adding `tf.data` prefetch stages or wrapping a Python loop in `tf.function`, it first drafts a plan in a read-only plan agent. This plan is presented for your review and approval. If the plan involves modifying files, like updating `pyproject.toml` or Keras model definitions, Atlas computes a unified diff for every proposed edit. This diff is surfaced for your explicit approval before any changes are written to disk, giving you granular control and preventing unintended modifications to your TensorFlow project. ## Steps 1. Run your TensorFlow command, such as `atlas bash 'pytest tests/model_training.py'` or `atlas bash 'uv install -r requirements.txt'`, through Atlas's `bash` tool. 2. Examine the `shell_metadata` block in Atlas's output when the command is killed by a timeout. 3. Decide from the `shell_metadata` message whether the TensorFlow command was 'waiting for interactive input' or 'exceeded its timeout'. 4. If the command was 'waiting for interactive input', re-run it with non-interactive flags, for example: `atlas bash 'uv install -r requirements.txt --no-input'`. 5. If the command 'exceeded its timeout', retry it with a larger timeout value as instructed, for example: `atlas bash --timeout 60000 'pytest tests/tf_data_pipeline.py'` for 60 seconds. 6. If you manually aborted the command, the `shell_metadata` will state 'User aborted the command', distinguishing it from an Atlas-imposed timeout. ## FAQ ### How does Atlas detect if my TensorFlow `pytest` run is blocked? Atlas's `bash` tool wraps your `pytest` command. If `pytest` attempts to prompt for input and receives none within the timeout, Atlas's `shell_metadata` will explicitly report that the command was 'waiting for interactive input', indicating it is blocked. ### What if my `tf.function` compilation takes a long time with Atlas? If Atlas reports your `tf.function` compilation 'exceeded its timeout', it means the operation is genuinely slow. You should re-run the command with a larger timeout value using `atlas bash --timeout 'your_command_here'` to accommodate the legitimate execution time. ### Can Atlas help with slow `tf.data` pipeline initialization? Yes, Atlas can diagnose slow `tf.data` pipeline initialization. If the setup exceeds the default timeout, Atlas will report it as genuinely slow. You can then increase the timeout for the `bash` command to allow the pipeline to initialize fully, and then use Atlas to add `prefetch` and `cache` stages to optimize it. ### How do I prevent `uv install` from hanging when run by Atlas? If `uv install` hangs because it's waiting for interactive input, Atlas's `shell_metadata` will tell you. To prevent this, re-run the command with non-interactive flags like `atlas bash 'uv install --no-input'` or `atlas bash 'uv install -y'`. ### Does Atlas modify my TensorFlow code without my permission? No, Atlas never modifies your TensorFlow code without explicit permission. It uses a read-only plan agent to draft changes, and any proposed file edits, such as to Keras model definitions or `pyproject.toml`, are presented as a unified diff for your approval before being written. ### How does Atlas integrate with my existing TensorFlow project setup? Atlas integrates by reading your `pyproject.toml` to understand dependencies like TensorFlow and Keras 3. It can then analyze your Keras model definitions, `tf.data` input pipelines, and custom training steps, allowing it to suggest and apply optimizations or diagnose issues within your existing setup. --- Canonical HTML: https://runatlas.sh/resources/stacks/diagnose-a-hanging-or-long-running-command-in-tensorflow Source of truth: aeo_pages row `/resources/stacks/diagnose-a-hanging-or-long-running-command-in-tensorflow` (segment: Stacks) (this file is generated from it, never hand-edited). Licence: Atlas is proprietary with a free core. It is not open source and there is no public source repository.