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At least 469 records · Page 26
All sourcesNASA NTRSDOE OSTI
DOE OSTI2026

Transformer-based operator learning framework for self-energy in strongly correlated systems

We introduce Σ-Attention, a transformer-based operator-learning framework for approximating the self-energy operator of strongly correlated electronic systems. By creating a batched dataset that combines results from three complementary approaches, i.e., many-body perturbation theory, strong-coupling expansion, and exact diagonalization, each effective in specific parameter regimes, Σ-Attention is applied to learn an accurate approximation for the self-energy operator that is valid across a wide range of parameter regimes. This hybrid strategy leverages the strengths of existing methods while relying on the transformer's ability to generalize beyond individual limitations. More importantly, the scalability of the transformer architecture allows the learned self-energy to be extended to systems with larger sizes, leading to much improved computational scaling. Using the one-dimensional Hubbard model, we demonstrate that Σ-Attention can accurately predict the Matsubara Green's function of large systems with a wide range of coupling strength. Our framework offers a promising and scalable pathway for studying strongly correlated systems with many possible generalizations.

Zhu, Yuanran↗
DOE OSTI2020

Materials Data on Ba(Mo3S4)2 by Materials Project

BaMo6S8 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Ba2+ is bonded in a body-centered cubic geometry to eight S2- atoms. There are a spread of Ba–S bond distances ranging from 3.01–3.30 Å. There are three inequivalent Mo+2.33+ sites. In the first Mo+2.33+ site, Mo+2.33+ is bonded to five S2- atoms to form a mixture of edge and corner-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.38–2.65 Å. In the second Mo+2.33+ site, Mo+2.33+ is bonded to five S2- atoms to form a mixture of edge and corner-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.37–2.65 Å. In the third Mo+2.33+ site, Mo+2.33+ is bonded to five S2- atoms to form a mixture of edge and corner-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.44–2.68 Å. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 4-coordinate geometry to one Ba2+ and three Mo+2.33+ atoms. In the second S2- site, S2- is bonded in a 5-coordinate geometry to one Ba2+ and four Mo+2.33+ atoms. In the third S2- site, S2- is bonded in a 5-coordinate geometry to one Ba2+ and four Mo+2.33+ atoms. In the fourth S2- site, S2- is bonded in a 5-coordinate geometry to one Ba2+ and four Mo+2.33+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgU2O6 by Materials Project

MgU2O6 is alpha bismuth trifluoride-derived structured and crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Mg2+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Mg–O bond distances ranging from 2.24–2.37 Å. There are two inequivalent U5+ sites. In the first U5+ site, U5+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of U–O bond distances ranging from 2.24–2.31 Å. In the second U5+ site, U5+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of U–O bond distances ranging from 2.20–2.30 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to one Mg2+ and three U5+ atoms to form a mixture of edge and corner-sharing OMgU3 tetrahedra. In the second O2- site, O2- is bonded to one Mg2+ and three U5+ atoms to form a mixture of edge and corner-sharing OMgU3 tetrahedra. In the third O2- site, O2- is bonded to two equivalent Mg2+ and two U5+ atoms to form a mixture of edge and corner-sharing OMg2U2 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaSr3I8 by Materials Project

BaSr3I8 is Fluorite-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ba2+ is bonded in a body-centered cubic geometry to eight equivalent I1- atoms. All Ba–I bond lengths are 3.59 Å. There are two inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a body-centered cubic geometry to eight equivalent I1- atoms. All Sr–I bond lengths are 3.51 Å. In the second Sr2+ site, Sr2+ is bonded in a body-centered cubic geometry to eight equivalent I1- atoms. All Sr–I bond lengths are 3.51 Å. I1- is bonded to one Ba2+ and three Sr2+ atoms to form a mixture of edge and corner-sharing IBaSr3 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(Mo3S4)2 by Materials Project

Sr(Mo3S4)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Sr2+ is bonded in a body-centered cubic geometry to eight S2- atoms. There are a spread of Sr–S bond distances ranging from 2.88–3.21 Å. There are three inequivalent Mo+2.33+ sites. In the first Mo+2.33+ site, Mo+2.33+ is bonded to five S2- atoms to form a mixture of edge and corner-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.38–2.62 Å. In the second Mo+2.33+ site, Mo+2.33+ is bonded to five S2- atoms to form a mixture of edge and corner-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.44–2.64 Å. In the third Mo+2.33+ site, Mo+2.33+ is bonded to five S2- atoms to form a mixture of edge and corner-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.39–2.62 Å. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 5-coordinate geometry to one Sr2+ and four Mo+2.33+ atoms. In the second S2- site, S2- is bonded in a 5-coordinate geometry to one Sr2+ and four Mo+2.33+ atoms. In the third S2- site, S2- is bonded in a 4-coordinate geometry to one Sr2+ and three Mo+2.33+ atoms. In the fourth S2- site, S2- is bonded in a 5-coordinate geometry to one Sr2+ and four Mo+2.33+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2Mn3S4 by Materials Project

Cs2Mn3S4 crystallizes in the monoclinic C2 space group. The structure is three-dimensional. Cs1+ is bonded in a body-centered cubic geometry to eight S2- atoms. There are a spread of Cs–S bond distances ranging from 3.68–3.77 Å. There are three inequivalent Mn2+ sites. In the first Mn2+ site, Mn2+ is bonded to four S2- atoms to form edge-sharing MnS4 tetrahedra. All Mn–S bond lengths are 2.41 Å. In the second Mn2+ site, Mn2+ is bonded to four S2- atoms to form a mixture of edge and corner-sharing MnS4 tetrahedra. All Mn–S bond lengths are 2.48 Å. In the third Mn2+ site, Mn2+ is bonded to four S2- atoms to form a mixture of edge and corner-sharing MnS4 tetrahedra. There are two shorter (2.48 Å) and two longer (2.49 Å) Mn–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 3-coordinate geometry to four equivalent Cs1+ and three Mn2+ atoms. In the second S2- site, S2- is bonded in a 3-coordinate geometry to four equivalent Cs1+ and three Mn2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KBa4(FeAs)10 by Materials Project

KBa4(FeAs)10 is alpha bismuth trifluoride-derived structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. K1+ is bonded in a body-centered cubic geometry to eight As3- atoms. All K–As bond lengths are 3.43 Å. There are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a body-centered cubic geometry to eight As3- atoms. There are a spread of Ba–As bond distances ranging from 3.39–3.48 Å. In the second Ba2+ site, Ba2+ is bonded in a body-centered cubic geometry to eight As3- atoms. There are a spread of Ba–As bond distances ranging from 3.39–3.47 Å. There are three inequivalent Fe+2.10+ sites. In the first Fe+2.10+ site, Fe+2.10+ is bonded to four As3- atoms to form a mixture of edge and corner-sharing FeAs4 tetrahedra. There are two shorter (2.31 Å) and two longer (2.32 Å) Fe–As bond lengths. In the second Fe+2.10+ site, Fe+2.10+ is bonded to four As3- atoms to form a mixture of edge and corner-sharing FeAs4 tetrahedra. There are one shorter (2.31 Å) and three longer (2.32 Å) Fe–As bond lengths. In the third Fe+2.10+ site, Fe+2.10+ is bonded to four As3- atoms to form a mixture of edge and corner-sharing FeAs4 tetrahedra. All Fe–As bond lengths are 2.32 Å. There are three inequivalent As3- sites. In the first As3- site, As3- is bonded in a 8-coordinate geometry to one K1+, three Ba2+, and four Fe+2.10+ atoms. In the second As3- site, As3- is bonded in a 8-coordinate geometry to one K1+, three Ba2+, and four Fe+2.10+ atoms. In the third As3- site, As3- is bonded in a 8-coordinate geometry to four Ba2+ and four Fe+2.10+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaSr4(FeO2)5 by Materials Project

BaSr4(FeO2)5 crystallizes in the monoclinic P2/m space group. The structure is three-dimensional. Ba2+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.72–2.82 Å. There are two inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Sr–O bond distances ranging from 2.64–2.76 Å. In the second Sr2+ site, Sr2+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Sr–O bond distances ranging from 2.64–2.73 Å. There are three inequivalent Fe2+ sites. In the first Fe2+ site, Fe2+ is bonded in a square co-planar geometry to four O2- atoms. There are a spread of Fe–O bond distances ranging from 2.04–2.07 Å. In the second Fe2+ site, Fe2+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. All Fe–O bond lengths are 2.04 Å. In the third Fe2+ site, Fe2+ is bonded in a square co-planar geometry to four O2- atoms. There are two shorter (2.04 Å) and two longer (2.07 Å) Fe–O bond lengths. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Ba2+, two equivalent Sr2+, and two Fe2+ atoms to form a mixture of distorted corner, edge, and face-sharing OBa2Sr2Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–66°. In the second O2- site, O2- is bonded to four equivalent Sr2+ and two equivalent Fe2+ atoms to form a mixture of corner, edge, and face-sharing OSr4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–65°. In the third O2- site, O2- is bonded to four Sr2+ and two Fe2+ atoms to form distorted OSr4Fe2 octahedra that share corners with fourteen OBa2Sr2Fe2 octahedra, edges with four OBa2Sr2Fe2 octahedra, and faces with four OSr4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–65°. In the fourth O2- site, O2- is bonded to one Ba2+, three Sr2+, and two equivalent Fe2+ atoms to form distorted OBaSr3Fe2 octahedra that share corners with fourteen OBa2Sr2Fe2 octahedra, edges with four OSr4Fe2 octahedra, and faces with four OBa2Sr2Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–65°. In the fifth O2- site, O2- is bonded to four Sr2+ and two equivalent Fe2+ atoms to form distorted OSr4Fe2 octahedra that share corners with fourteen OBa2Sr2Fe2 octahedra, edges with four OSr4Fe2 octahedra, and faces with four OSr4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–66°. In the sixth O2- site, O2- is bonded to two equivalent Ba2+, two equivalent Sr2+, and two equivalent Fe2+ atoms to form distorted OBa2Sr2Fe2 octahedra that share corners with fourteen OSr4Fe2 octahedra, edges with four equivalent OBaSr3Fe2 octahedra, and faces with four equivalent OBa2Sr2Fe2 octahedra. The corner-sharing octahedra tilt angles range from 0–65°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TbCe3O8 by Materials Project

TbCe3O8 is Fluorite-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Tb4+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Tb–O bond lengths are 2.38 Å. There are two inequivalent Ce4+ sites. In the first Ce4+ site, Ce4+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Ce–O bond lengths are 2.36 Å. In the second Ce4+ site, Ce4+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Ce–O bond lengths are 2.36 Å. O2- is bonded to one Tb4+ and three Ce4+ atoms to form a mixture of corner and edge-sharing OTbCe3 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce2ThO6 by Materials Project

ThCe2O6 is Fluorite-derived structured and crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Th4+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are six shorter (2.40 Å) and two longer (2.44 Å) Th–O bond lengths. Ce4+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Ce–O bond distances ranging from 2.34–2.39 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to one Th4+ and three equivalent Ce4+ atoms to form OCe3Th tetrahedra that share corners with sixteen OCe3Th tetrahedra and edges with six OCeTh3 tetrahedra. In the second O2- site, O2- is bonded to three equivalent Th4+ and one Ce4+ atom to form a mixture of corner and edge-sharing OCeTh3 tetrahedra. In the third O2- site, O2- is bonded to four equivalent Ce4+ atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V(Mo3Se4)2 by Materials Project

V(Mo3Se4)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. V4+ is bonded in a body-centered cubic geometry to eight Se2- atoms. There are a spread of V–Se bond distances ranging from 2.56–3.12 Å. There are three inequivalent Mo2+ sites. In the first Mo2+ site, Mo2+ is bonded to five Se2- atoms to form a mixture of edge and corner-sharing MoSe5 square pyramids. There are a spread of Mo–Se bond distances ranging from 2.54–2.72 Å. In the second Mo2+ site, Mo2+ is bonded to five Se2- atoms to form a mixture of edge and corner-sharing MoSe5 square pyramids. There are a spread of Mo–Se bond distances ranging from 2.54–2.69 Å. In the third Mo2+ site, Mo2+ is bonded to five Se2- atoms to form a mixture of edge and corner-sharing MoSe5 square pyramids. There are a spread of Mo–Se bond distances ranging from 2.54–2.69 Å. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 5-coordinate geometry to one V4+ and four Mo2+ atoms. In the second Se2- site, Se2- is bonded in a 1-coordinate geometry to one V4+ and three Mo2+ atoms. In the third Se2- site, Se2- is bonded in a 5-coordinate geometry to one V4+ and four Mo2+ atoms. In the fourth Se2- site, Se2- is bonded in a 5-coordinate geometry to one V4+ and four Mo2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce3PrO8 by Materials Project

PrCe3O8 is Fluorite-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr4+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Pr–O bond lengths are 2.45 Å. There are two inequivalent Ce4+ sites. In the first Ce4+ site, Ce4+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Ce–O bond lengths are 2.37 Å. In the second Ce4+ site, Ce4+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Ce–O bond lengths are 2.37 Å. O2- is bonded to one Pr4+ and three Ce4+ atoms to form a mixture of corner and edge-sharing OCe3Pr tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgTi3H8 by Materials Project

MgTi3H8 is Fluorite-derived structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mg2+ is bonded in a body-centered cubic geometry to eight equivalent H1- atoms. All Mg–H bond lengths are 1.96 Å. Ti2+ is bonded in a body-centered cubic geometry to eight equivalent H1- atoms. All Ti–H bond lengths are 1.92 Å. H1- is bonded to one Mg2+ and three equivalent Ti2+ atoms to form a mixture of edge and corner-sharing HMgTi3 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce2UO6 by Materials Project

Ce2UO6 is alpha bismuth trifluoride-derived structured and crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. U6+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are two shorter (2.17 Å) and six longer (2.33 Å) U–O bond lengths. Ce3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Ce–O bond distances ranging from 2.35–2.47 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to one U6+ and three equivalent Ce3+ atoms to form OCe3U tetrahedra that share corners with sixteen OCe3U tetrahedra and edges with six OCeU3 tetrahedra. In the second O2- site, O2- is bonded to three equivalent U6+ and one Ce3+ atom to form a mixture of edge and corner-sharing OCeU3 tetrahedra. In the third O2- site, O2- is bonded to four equivalent Ce3+ atoms to form a mixture of edge and corner-sharing OCe4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La4CeZr3O14 by Materials Project

CeLa4Zr3O14 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ce4+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are six shorter (2.38 Å) and two longer (2.39 Å) Ce–O bond lengths. There are two inequivalent La3+ sites. In the first La3+ site, La3+ is bonded in a distorted hexagonal planar geometry to six equivalent O2- atoms. All La–O bond lengths are 2.39 Å. In the second La3+ site, La3+ is bonded in a distorted hexagonal planar geometry to six O2- atoms. There are two shorter (2.37 Å) and four longer (2.38 Å) La–O bond lengths. Zr4+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Zr–O bond distances ranging from 2.25–2.33 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to one Ce4+ and three equivalent Zr4+ atoms to form a mixture of corner and edge-sharing OCeZr3 tetrahedra. In the second O2- site, O2- is bonded to two La3+ and two equivalent Zr4+ atoms to form a mixture of corner and edge-sharing OLa2Zr2 tetrahedra. In the third O2- site, O2- is bonded to one Ce4+, two equivalent La3+, and one Zr4+ atom to form a mixture of corner and edge-sharing OLa2CeZr tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(Mo3S4)2 by Materials Project

CaMo6S8 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Ca2+ is bonded in a body-centered cubic geometry to eight S2- atoms. There are a spread of Ca–S bond distances ranging from 2.74–3.12 Å. There are three inequivalent Mo+2.33+ sites. In the first Mo+2.33+ site, Mo+2.33+ is bonded to five S2- atoms to form a mixture of edge and corner-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.41–2.61 Å. In the second Mo+2.33+ site, Mo+2.33+ is bonded to five S2- atoms to form a mixture of edge and corner-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.44–2.61 Å. In the third Mo+2.33+ site, Mo+2.33+ is bonded to five S2- atoms to form a mixture of edge and corner-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.40–2.60 Å. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 5-coordinate geometry to one Ca2+ and four Mo+2.33+ atoms. In the second S2- site, S2- is bonded in a 1-coordinate geometry to one Ca2+ and three Mo+2.33+ atoms. In the third S2- site, S2- is bonded in a 5-coordinate geometry to one Ca2+ and four Mo+2.33+ atoms. In the fourth S2- site, S2- is bonded in a 5-coordinate geometry to one Ca2+ and four Mo+2.33+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Mechanical and Thermal Properties of Low-Density Al 20+x Cr 20-x Mo 20-y Ti 20 V 20+y Alloys

Refractory high-entropy alloys (RHEAs) Al 20+x Cr 20-x Mo 20-y Ti 20 V 20+y ((x, y) = (0, 0), (0, 10), and (10, 15)) were computationally studied to obtain a low density and a better mechanical property. The density functional theory (DFT) method was employed to compute the structural and mechanical properties of the alloys, based on a large unit cell model of randomly distributed elements. Debye–Grüneisen theory was used to study the thermal properties of Al 20+x Cr 20-x Mo 20-y Ti 20 V 20+y . The phase diagram calculation shows that all three RHEAs have a single body-centered cubic (BCC) structure at high temperatures ranging from 1000 K to 2000 K. The RHEA Al 30 Cr 10 Mo 5 Ti 20 V 35 has shown a low density of 5.16 g/cm 3 and a hardness of 5.56 GPa. The studied RHEAs could be potential candidates for high-temperature application materials where high hardness, ductility, and low density are required.

36 MATERIALS SCIENCE↗
DOE OSTI2024

Efficient Parallelization of Irregular Applications on GPU Architectures

With the enlarging computation capacity of general Graphics Processing Units (GPUs), leveraging GPUs to accelerate parallel applications has become a critical topic in academia and industry. However, a wide range of irregular applications with the computation-/memory-intensive nature cannot easily achieve high GPU utilization. The challenges mainly involve the following aspects: first, data dependence leads to coarse-grained kernel and inefficient parallelism; second, heavy GPU memory usage may cause frequent memory evictions and extra overhead of I/O; third, specific computation patterns produce memory redundancies; last, workload balance and data reusability conjunctly benefit the overall performance, but there may exist a dynamic trade-off between them. Targeting these challenges, this dissertation proposes multiple optimizations to accelerate two real-world applications: many-body correlation functions to simulate nuclear physics in a large-scale scientific system; the other is the eALS-based matrix factorization recommendation system. To accelerate the calculations of many-body correlation functions, this dissertation presents three frameworks in GPU memory management and multi-GPU scheduling. Firstly, an optimized systematic GPU memory management framework, MemHC, utilizes a series of new memory reduction designs in GPU memory allocation, CPU/GPU communications, and GPU memory oversubscription. Secondly, an enhanced multi-GPU scheduling framework, MICCO, particularly by taking both data dimension (e.g., data reuse and data eviction) and computation dimension into account. MICCO designs a heuristic scheduling algorithm and a machine learning-based regression model to generate the optimal settings of a proposed new concept to manage the trade-off. Thirdly, a locality-aware multi-GPU scheduling framework. This scheduler leverages pipeline batch generation with a looking-ahead strategy by building local dependency graphs for memory transfer reduction and better data reuse, achieving up to 79.92% memory cost reduction and 1.67x speedup. To parallelize the eALS-based recommendation system, this dissertation proposes an efficient CPU/GPU heterogeneous recommendation system, HEALS. HEALS employs newly designed architecture-adaptive data formats to achieve load balance and good data locality on CPU and GPU. To mitigate the data dependence, HEALS presents a CPU/GPU collaboration model for both task parallelism and data parallelism with multiple kernel computation optimizations. In summary, this dissertation efficiently accelerates two typical irregular applications on GPUs by building four frameworks, including CPU/GPU collaboration, GPU memory management, and multi-GPU scheduling.

Wang, Qihan↗