Cited by 6Reinforcement Learning in RoboticsSpeech and dialogue systemsSpatial Cognition and Navigation

CAVEN: An Embodied Conversational Agent for Efficient Audio-Visual Navigation in Noisy Environments

Open access
Liu, Xiulong, Paul, Sudipta, Chatterjee, Moitreya, Cherian, Anoop·2024·Proceedings of the AAAI Conference on Artificial Intelligence

Abstract

Audio-visual navigation of an agent towards locating an audio goal is a challenging task especially when the audio is sporadic or the environment is noisy. In this paper, we present CAVEN, a Conversation-based Audio-Visual Embodied Navigation framework in which the agent may interact with a human/oracle for solving the task of navigating to an audio goal. Specifically, CAVEN is modeled as a budget-aware partially observable semi-Markov decision process that implicitly learns the uncertainty in the audio-based navigation policy to decide when and how the agent may interact with the oracle. Our CAVEN agent can engage in fully-bidirectional natural language conversations by producing relevant questions and interpret free-form, potentially noisy responses from the oracle based on the audio-visual context. To enable such a capability, CAVEN is equipped with: i) a trajectory forecasting network that is grounded in audio-visual cues to produce a potential trajectory to the estimated goal, and (ii) a natural language based question generation and reasoning network to pose an interactive question to the oracle or interpret the oracle's response to produce navigation instructions. To train the interactive modules, we present a large scale dataset: AVN-Instruct, based on the Landmark-RxR dataset. To substantiate the usefulness of conversations, we present experiments on the benchmark audio-goal task using the SoundSpaces simulator under various noisy settings. Our results reveal that our fully-conversational approach leads to nearly an order-of-magnitude improvement in success rate, especially in localizing new sound sources and against methods that use only uni-directional interaction.

Integrity signals

Registry

Crossref · 10.1609/aaai.v38i4.28167

Cites

68 of 68 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

3 of 3 cited sources checked · 1 supported · 0 flagged · accuracy not yet measured

  • Findingown data

    The question policy is chosen more frequently when the agent has moderate confidence.

    “It is note-worthy that the question policy is invoked more often when the agent is moderately confident.”
    Quote in the paperNot a substantial claim
    • Rests on an assumption: The oracle supplies useful language instructions when the agent queries it.
    • Rests on an assumption: The AVN-Instruct dataset generated by the pre-trained QuestionNet is valid training data for the language interaction modules.
  • Findingown data

    In the authors' experiments, omitting the penalty for correct questions improved results, with δ_ques set to zero.

    “In our experiments, we find that not penalizing the agent for correct questions leads to better results, i.e., δ ques (m) = 0.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The oracle supplies useful language instructions when the agent queries it.
  • Findingown data

    CAVEN performed better than Paul et al. even when the oracle was noisy.

    “Even with a noisy oracle, i.e., Noisy Language in Table 1, we achieve better performances compared to Paul et al.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The oracle supplies useful language instructions when the agent queries it.
    • Rests on an assumption: The AVN-Instruct dataset generated by the pre-trained QuestionNet is valid training data for the language interaction modules.
    • Rests on an assumption: The simulated noisy oracle, created by random trajectories or 25% yes/no flips, adequately represents real-world noise.
  • Findingown data

    In the distractor-sound setting, CAVEN achieved gains of 5.5% on SPL and 3.1% on SNO relative to the closest competitor.

    “Even under such challenging circumstances, as shown in Table 2, we notice a 5.5% and a 3.1% gain on SPL and SNO, respectively against our closest competitor.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The oracle supplies useful language instructions when the agent queries it.
    • Rests on an assumption: The AVN-Instruct dataset generated by the pre-trained QuestionNet is valid training data for the language interaction modules.
  • Findingown data

    CAVEN achieved a 12% improvement on the SNO metric compared to Paul et al., the closest competitor, in both heard and unheard conditions.

    “CAVEN exhibits a 12% gain on the newly introduced SNO metric over Paul et al., our closest competitor, in both heard and unheard cases.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The oracle supplies useful language instructions when the agent queries it.
    • Rests on an assumption: The AVN-Instruct dataset generated by the pre-trained QuestionNet is valid training data for the language interaction modules.
  • May combine two claims. 12
  • The quote only partly states this claim. 1
  • Classified as probably not a substantial claim. 4
  • May combine two claims.

    Premisecitation

    The oracle in AVLEN has access to the 3D space of the full environment and can provide plausible instructions for navigation.

    “Note that the oracle in AVLEN has access to the 3D space of the full environment and thus can provide plausible instructions for navigation, however CAVEN has only a very restricted view of the scene in its vicinity, thus making this task of creating a question at the agent's side entirely different from that of the oracle's.”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites Paul et al. 2022 source

      The Proposed Method (pp. 4, 7) says the oracle knows the shortest path from the agent to the AudioGoal and generates a short natural-language instruction from a segment of that path. This supports its ability to give navigation instructions, but our copy does not establish that it has access to the full environment’s 3D space, rather than the path and observations used to generate the instruction. (LLM, conf=0.82)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Premisecitation

    The AVLEN agent could ask only a fixed question while the oracle could provide a natural-language reply that guided the agent toward the goal.

    “In particular, the AVLEN agent could ask only a fixed question (e.g.,”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites Paul et al., 2022 source
  • May combine two claims.

    Premisecitation

    The AVLEN agent cannot pose questions, which burdens the oracle with charting a path whenever help is sought.

    “However, there is no provision of posing questions, which burdens the oracle with the task of chalking out a path to the goal whenever help is sought.”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites Paul et al., 2022 source

      The Problem Formulation (p. 4) gives the agent a query action, but describes no facility for posing a specific question; the oracle responds with a navigation instruction. The Problem Setup (p. 4) says that instruction describes only an initial segment of the shortest path, not a complete path to the goal. Thus the claim captures the limited form of help-seeking but overstates what the oracle must provide. (LLM, conf=0.82)

      Experimental — accuracy not yet measured
  • The quote only partly states this claim.

    Findingown data

    The learned selector policy π_s outperformed the alternative strategies tested.

    “Our results show learning of π s is better.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The oracle supplies useful language instructions when the agent queries it.
    • Rests on an assumption: The AVN-Instruct dataset generated by the pre-trained QuestionNet is valid training data for the language interaction modules.
  • May combine two claims.

    Findingown data

    Quantitative evaluations across various noisy settings showed large performance improvements over competing methods, supporting the benefits of the proposed interaction policies and architecture.

    “Quantitative evaluations of CAVEN under various noisy problem settings, using established and novel metrics, demonstrate large improvements in performance over competing methods, substantiating the benefits of our proposed interaction policies and our architecture.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The oracle supplies useful language instructions when the agent queries it.
    • Rests on an assumption: The AVN-Instruct dataset generated by the pre-trained QuestionNet is valid training data for the language interaction modules.
  • May combine two claims.

    Findingown data

    Under the oracle instruction budget, CAVEN asked a correct question roughly 40% of the time, which reduced its penalty.

    “Given the budget on directly receiving instructions from the oracle, we find that CAVEN poses a correct question about 40% of the time, thereby incurring less penalty.”
    Quote in the paperNot a substantial claim
    • Rests on an assumption: The oracle supplies useful language instructions when the agent queries it.
    • Rests on an assumption: The AVN-Instruct dataset generated by the pre-trained QuestionNet is valid training data for the language interaction modules.
  • May combine two claims.

    Findingown data

    The audio-goal policy is selected when the agent has high confidence, while the language-based policy is selected when confidence is low.

    “As shown in Figure 4, the audio-goal is invoked when the agent is highly confident and the language-based policy is invoked when agent's confidence is low.”
    Quote in the paperNot a substantial claim
    • Rests on an assumption: The oracle supplies useful language instructions when the agent queries it.
    • Rests on an assumption: The AVN-Instruct dataset generated by the pre-trained QuestionNet is valid training data for the language interaction modules.
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Interpretationown data

    The newly introduced SNI and SNO metrics help clarify the performance improvement observed in conversational settings.

    “These additional metrics help explain the performance gain under conversational settings.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Interpretationreasoning

    CAVEN addresses all six challenges (when to use language, what interaction type, how to phrase questions, how to make the oracle understand, how the oracle responds, how frequently to ask) within a single framework using a budget-aware POSMDP and reinforcement learning with novel rewards.

    “However in CAVEN, we tackle all these challenges within a single framework, by proposing a novel budget-aware partially observable semi-Markov decision process (POSMDP), using a reinforcement learning framework by introducing novel learning rewards.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim.

    Interpretationreasoning

    CAVEN's POSMDP disentangles interactive audio goal navigation into three low-level options: audio-visual navigation, instruction-guided navigation, and bi-directional question-answer navigation.

    “In our setup, we disentangle agents' interactive audio goal navigation process into three low level temporal abstractions (i.e., options): i) audio-visual navigation ξ g , ii) instruction-guided navigation ξ l , iii) bi-directional questionanswer navigation ξ ques .”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationnone given

    CAVEN's question module consists of a trajectory forecasting network grounded in audio-visual cues, a natural language question generation and reasoning network, and a question decoder (FollowerNet) on the oracle.

    “CAVEN is equipped with: i) a trajectory forecasting network that is grounded in audio-visual cues to produce a potential trajectory to the estimated goal, and (ii) a natural language based question generation and reasoning network to pose an interactive question to the oracle or interpret the oracle's response to produce navigation instructions.”
    • Also stated in: § Introduction · plain
      “We introduce a novel question module for bi-directional interaction with the oracle consisting of: (i) a trajectory forecasting module grounded on both visual scenes and audio cues, (ii) a question generation module, and (iii) a question decoder (FollowerNet, on the oracle).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationreasoning

    CAVEN sees only a narrow local region of the scene, so generating a question on the agent side differs from the oracle's task.

    “Note that the oracle in AVLEN has access to the 3D space of the full environment and thus can provide plausible instructions for navigation, however CAVEN has only a very restricted view of the scene in its vicinity, thus making this task of creating a question at the agent's side entirely different from that of the oracle's.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationreasoning

    Although asking questions risks penalties for wrong questions, the question policy benefits from using the agent's own beliefs to seek confirmation and reduce uncertainty, leading to efficient navigation.

    “Though it potentially risks being penalized by asking wrong questions, it benefits from seeking confirmation from the oracle using its own beliefs to alleviate uncertainty, thus navigating efficiently.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The oracle supplies useful language instructions when the agent queries it.
    • Rests on an assumption: The AVN-Instruct dataset generated by the pre-trained QuestionNet is valid training data for the language interaction modules.
  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationnone given

    CAVEN is robust to noisy feedback from the oracle.

    “Further, our agent is also robust to noisy feedback from oracle.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Interpretationreasoning

    When uncertain, CAVEN can interact with the oracle in a question mode, forecasting a trajectory, framing a question, and interpreting the response.

    “(i) a question mode, in which the agent forecasts a plausible trajectory based on audio-goal belief, using which it frames a natural language question to be posed to the oracle, and subsequently interpreting the oracle's response to the question”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationnone given

    Asking correct questions results in minimal oracle effort in producing a response.

    “Since, asking correct question results in minimal oracle effort in producing a response, we define a dynamic penalty based on the question by”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Interpretationnone given

    CAVEN is a conversation-based audio-visual embodied navigation framework where an agent can interact with a human or oracle to navigate to an audio goal.

    “In this paper, we present CAVEN, a Conversation-based Audio-Visual Embodied Navigation framework in which the agent may interact with a human/oracle for solving the task of navigating to an audio goal.”
    Quote in the paperSubstantial claim
17 of 17
  • The authors state this as an assumption.

    The three options are valid in any state of the environment.

    “These options are assumed valid in any state of the environment, i.e., S ξg , S ξ l , S ξques ∈ S.”
  • The authors state this as an assumption.

    The sound is semantically unique and produced by a static object, though it may be noisy, sporadic, or mixed with other environmental sounds.

    “As in (Chen et al. 2020), we assume the sound is semantically unique and is produced by a static object, however the audio could be noisy, sporadic, or mixed up with other environmental sounds.”
  • The authors state this as an assumption.

    After receiving a question, the oracle gives a yes response if its interpretation of the question in its own state space yields actions matching its estimate of the actions along the ground-truth geodesic to the goal; otherwise it responds no followed by a short guiding sentence.

    “Further, we assume the oracle after receiving this question, will either give a”
  • The authors state this as an assumption.

    The number of times an agent can receive direct navigation instructions from the oracle is limited by a budget.

    “In our new problem setup, we also assume that the number of times an agent can receive direct navigation instructions from the oracle (as a result of a wrong question or when it directly queries) is limited by a budget so that the agent only seeks help when necessary.”
  • The paper relies on this without support.

    The oracle supplies useful language instructions when the agent queries it.

    “When invoked, the agent receives instructions, similar to when a wrong question is posed to the oracle.”
    “To cater to such cases, we equip the agent to directly query the oracle for language-based instructions.”
  • The paper relies on this without support.

    The AVN-Instruct dataset generated by the pre-trained QuestionNet is valid training data for the language interaction modules.

    “Then we adopt the pre-trained QuestionNet to synthesize a dataset called AVN-Instruct, which contains a total of 41.5k dense pairs of sub-instructions, audio-goal, and visual scene under the state space of Soundspace simulator.”
    “Before integrating the modules into the RL framework, we fine-tune the whole question module end-to-end on AVN-Instruct with a set of 500 and 1000 samples for validation and testing.”
  • The paper relies on this without support.

    The simulated noisy oracle, created by random trajectories or 25% yes/no flips, adequately represents real-world noise.

    “To induce noise, we either ground the generated oracle's instructions on random trajectories or switch 'yes'/'no' responses, both with a chance of 25%.”
7 of 7

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Correct questions can still incur a frequency penalty

    Minor

    The text says a correct question incurs no penalty, but the total question penalty also includes ζfques for asking too many questions. That term can apply even when the question is correct.

  • A tested reward value lies outside its stated range

    Minor

    The definition restricts the parameter for a non-'no' response to values below 1, yet the paper discusses and reports an experiment with that parameter set to 1.0.

  • Success-rate improvement is described at incompatible scales

    Minor

    The paper characterizes its success-rate gain over competing approaches as nearly 12%, but also calls the gain over related approaches an order of magnitude. Those descriptions do not agree for the reported comparison.

3 of 3

Cites

Flagged first, then by citations

Research works printed but not linked: 2

  1. [3]3. PMLR.
  2. [20]20. He, K.; et al. 2021. Landmark-RxR: Solving Vision-and- Language Navigation with Fine-Grained Alignment Super- vision. In Ranzato, M.; and etal, eds., Advances in Neural Information Processing Systems, volume 34, 652-663.

Cited by

Sorted by citations

Authors
Liu, X., Paul, S., Chatterjee, M., & Cherian, A.
Affiliations
  • University of Washington (US)
  • Mitsubishi Electric Research Laboratories (United States) (US)
Venue
Proceedings of the AAAI Conference on Artificial Intelligence
Published
2024-03-24
Volume
38
Issue
4
Pages
3765-3773
ISSN
  • 2159-5399 (ISSN-L)
  • 2374-3468
OpenAlex
W4393149068
Cited by
6
References
56
Citations by year
2025: 5 · 2024: 1
FWCI
1.73
Type
conference paper
Language
en
Open access
Locations
  • Proceedings of the AAAI Conference on Artificial Intelligence (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • AAAI Publications (The Association for the Advancement of Artificial Intelligence (AAAI)) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Reinforcement Learning in Robotics
  • Physical Sciences › Computer Science › Artificial Intelligence › Speech and dialogue systems
  • Physical Sciences › Engineering › Automotive Engineering › Spatial Cognition and Navigation
Keywords
embodied conversational agents, noisy environments, semi-Markov decision process, trajectory prediction, question generation, natural language reasoning, sound localization

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